mirror of
https://github.com/MariaDB/server.git
synced 2025-01-30 18:41:56 +01:00
727491b72a
This includes all test changes from
"Changing all cost calculation to be given in milliseconds"
and forwards.
Some of the things that caused changes in the result files:
- As part of fixing tests, I added 'echo' to some comments to be able to
easier find out where things where wrong.
- MATERIALIZED has now a higher cost compared to X than before. Because
of this some MATERIALIZED types have changed to DEPENDEND SUBQUERY.
- Some test cases that required MATERIALIZED to repeat a bug was
changed by adding more rows to force MATERIALIZED to happen.
- 'Filtered' in SHOW EXPLAIN has in many case changed from 100.00 to
something smaller. This is because now filtered also takes into
account the smallest possible ref access and filters, even if they
where not used. Another reason for 'Filtered' being smaller is that
we now also take into account implicit filtering done for subqueries
using FIRSTMATCH.
(main.subselect_no_exists_to_in)
This is caluculated in best_access_path() and stored in records_out.
- Table orders has changed because more accurate costs.
- 'index' and 'ALL' for small tables has changed to use 'range' or
'ref' because of optimizer_scan_setup_cost.
- index can be changed to 'range' as 'range' optimizer assumes we don't
have to read the blocks from disk that range optimizer has already read.
This can be confusing in the case where there is no obvious where clause
but instead there is a hidden 'key_column > NULL' added by the optimizer.
(main.subselect_no_exists_to_in)
- Scan on primary clustered key does not report 'Using Index' anymore
(It's a table scan, not an index scan).
- For derived tables, the number of rows is now 100 instead of 2,
which can be seen in EXPLAIN.
- More tests have "Using index for group by" as the cost of this
optimization is now more correct (lower).
- A primary key could be preferred for a normal key, even if it would
access more rows, as it's faster to do 1 lokoup and 3 'index_next' on a
clustered primary key than one lookup trough a secondary.
(main.stat_tables_innodb)
Notes:
- There was a 4.7% more calls to best_extension_by_limited_search() in
the main.greedy_optimizer test. However examining the test results
it looked that the plans where slightly better (eq_ref where more
chained together) so I assume this is ok.
- I have verified a few test cases where there was notable/unexpected
changes in the plan and in all cases the new optimizer plans where
faster. (main.greedy_optimizer and some others)
1110 lines
38 KiB
Text
1110 lines
38 KiB
Text
drop table if exists t1, t2;
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#
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# Bug#48229: group by performance issue of partitioned table
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#
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CREATE TABLE t1 (a INT,b INT,KEY a (a,b));
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INSERT INTO `t1` VALUES (0,580092),(3000,894076),(4000,805483),(4000,913540),(6000,611137),(8000,171602),(9000,599495),(9000,746305),(10000,272829),(10000,847519),(12000,258869),(12000,929028),(13000,288970),(15000,20971),(15000,105839),(16000,788272),(17000,76914),(18000,827274),(19000,802258),(20000,123677),(20000,587729),(22000,701449),(25000,31565),(25000,230782),(25000,442887),(25000,733139),(25000,851020);
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SELECT COUNT(*) from t1 where a IN (10000, 1000000, 3000);
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COUNT(*)
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3
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EXPLAIN SELECT a, MAX(b) FROM t1 WHERE a IN (10000, 1000000, 3000) GROUP BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 3 Using where; Using index for group-by
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alter table t1 partition by hash(a) partitions 1;
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EXPLAIN SELECT a, MAX(b) FROM t1 WHERE a IN (10000, 1000000, 3000) GROUP BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 3 Using where; Using index for group-by
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alter table t1 remove partitioning;
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insert into t1 (a,b) select seq,seq from seq_4001_to_4100;
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insert into t1 (a,b) select seq,seq from seq_10001_to_10100;
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EXPLAIN SELECT a, MAX(b) FROM t1 WHERE a IN (10000, 1000000, 3000) GROUP BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 3 Using where; Using index for group-by
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alter table t1 partition by hash(a) partitions 1;
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EXPLAIN SELECT a, MAX(b) FROM t1 WHERE a IN (10000, 1000000, 3000) GROUP BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 3 Using where; Using index for group-by
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DROP TABLE t1;
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create table t1 (a DATETIME)
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partition by range (TO_DAYS(a))
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subpartition by hash(to_seconds(a))
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(partition p0 values less than (1));
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` datetime DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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PARTITION BY RANGE (to_days(`a`))
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SUBPARTITION BY HASH (to_seconds(`a`))
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(PARTITION `p0` VALUES LESS THAN (1) ENGINE = MyISAM)
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drop table t1;
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create table t1 (a int)
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partition by range (a)
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( partition p0 values less than (NULL),
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partition p1 values less than (MAXVALUE));
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ERROR HY000: Not allowed to use NULL value in VALUES LESS THAN
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create table t1 (a datetime not null)
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partition by range (TO_SECONDS(a))
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( partition p0 VALUES LESS THAN (TO_SECONDS('2007-03-08 00:00:00')),
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partition p1 VALUES LESS THAN (TO_SECONDS('2007-04-01 00:00:00')));
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select partition_method, partition_expression, partition_description
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from information_schema.partitions where table_name = "t1";
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partition_method partition_expression partition_description
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RANGE to_seconds(`a`) 63340531200
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RANGE to_seconds(`a`) 63342604800
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INSERT INTO t1 VALUES ('2007-03-01 12:00:00'), ('2007-03-07 12:00:00');
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INSERT INTO t1 VALUES ('2007-03-08 12:00:00'), ('2007-03-15 12:00:00');
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explain partitions select * from t1 where a < '2007-03-08 00:00:00';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a < '2007-03-08 00:00:01';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 4 Using where
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explain partitions select * from t1 where a <= '2007-03-08 00:00:00';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 4 Using where
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explain partitions select * from t1 where a <= '2007-03-07 23:59:59';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a < '2007-03-07 23:59:59';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0 ALL NULL NULL NULL NULL 2 Using where
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` datetime NOT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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PARTITION BY RANGE (to_seconds(`a`))
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(PARTITION `p0` VALUES LESS THAN (63340531200) ENGINE = MyISAM,
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PARTITION `p1` VALUES LESS THAN (63342604800) ENGINE = MyISAM)
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drop table t1;
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create table t1 (a date)
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partition by range(to_seconds(a))
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(partition p0 values less than (to_seconds('2004-01-01')),
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partition p1 values less than (to_seconds('2005-01-01')));
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insert into t1 values ('2003-12-30'),('2004-12-31');
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select * from t1;
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a
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2003-12-30
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2004-12-31
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explain partitions select * from t1 where a <= '2003-12-31';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0 system NULL NULL NULL NULL 1
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select * from t1 where a <= '2003-12-31';
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a
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2003-12-30
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explain partitions select * from t1 where a <= '2005-01-01';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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select * from t1 where a <= '2005-01-01';
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a
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2003-12-30
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2004-12-31
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` date DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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PARTITION BY RANGE (to_seconds(`a`))
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(PARTITION `p0` VALUES LESS THAN (63240134400) ENGINE = MyISAM,
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PARTITION `p1` VALUES LESS THAN (63271756800) ENGINE = MyISAM)
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drop table t1;
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create table t1 (a datetime)
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partition by range(to_seconds(a))
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(partition p0 values less than (to_seconds('2004-01-01 12:00:00')),
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partition p1 values less than (to_seconds('2005-01-01 12:00:00')));
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insert into t1 values ('2004-01-01 11:59:29'),('2005-01-01 11:59:59');
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select * from t1;
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a
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2004-01-01 11:59:29
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2005-01-01 11:59:59
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explain partitions select * from t1 where a <= '2004-01-01 11:59.59';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0 system NULL NULL NULL NULL 1
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select * from t1 where a <= '2004-01-01 11:59:59';
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a
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2004-01-01 11:59:29
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explain partitions select * from t1 where a <= '2005-01-01';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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select * from t1 where a <= '2005-01-01';
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a
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2004-01-01 11:59:29
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` datetime DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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PARTITION BY RANGE (to_seconds(`a`))
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(PARTITION `p0` VALUES LESS THAN (63240177600) ENGINE = MyISAM,
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PARTITION `p1` VALUES LESS THAN (63271800000) ENGINE = MyISAM)
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drop table t1;
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create table t1 (a int, b char(20))
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partition by range columns(a,b)
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(partition p0 values less than (1));
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ERROR 42000: Inconsistency in usage of column lists for partitioning near '))' at line 3
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create table t1 (a int, b char(20))
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partition by range(a)
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(partition p0 values less than (1,"b"));
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ERROR HY000: Cannot have more than one value for this type of RANGE partitioning
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create table t1 (a int, b char(20))
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partition by range(a)
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(partition p0 values less than (1,"b"));
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ERROR HY000: Cannot have more than one value for this type of RANGE partitioning
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create table t1 (a int, b char(20))
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partition by range columns(b)
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(partition p0 values less than ("b"));
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drop table t1;
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create table t1 (a int)
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partition by range (a)
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( partition p0 values less than (maxvalue));
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alter table t1 add partition (partition p1 values less than (100000));
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ERROR HY000: MAXVALUE can only be used in last partition definition
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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PARTITION BY RANGE (`a`)
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(PARTITION `p0` VALUES LESS THAN MAXVALUE ENGINE = MyISAM)
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drop table t1;
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create table t1 (a integer)
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partition by range (a)
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( partition p0 values less than (4),
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partition p1 values less than (100));
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create trigger tr1 before insert on t1
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for each row begin
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set @a = 1;
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end|
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alter table t1 drop partition p0;
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drop table t1;
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create table t1 (a integer)
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partition by range (a)
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( partition p0 values less than (4),
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partition p1 values less than (100));
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LOCK TABLES t1 WRITE;
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alter table t1 drop partition p0;
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alter table t1 reorganize partition p1 into
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( partition p0 values less than (4),
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partition p1 values less than (100));
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alter table t1 add partition ( partition p2 values less than (200));
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UNLOCK TABLES;
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drop table t1;
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create table t1 (a int unsigned)
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partition by range (a)
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(partition pnull values less than (0),
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partition p0 values less than (1),
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partition p1 values less than(2));
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insert into t1 values (null),(0),(1);
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select * from t1 where a is null;
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a
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NULL
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select * from t1 where a >= 0;
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a
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0
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1
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select * from t1 where a < 0;
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a
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select * from t1 where a <= 0;
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a
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0
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select * from t1 where a > 1;
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a
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explain partitions select * from t1 where a is null;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 pnull system NULL NULL NULL NULL 1
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explain partitions select * from t1 where a >= 0;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a < 0;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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explain partitions select * from t1 where a <= 0;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 pnull,p0 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a > 1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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drop table t1;
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create table t1 (a int unsigned, b int unsigned)
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partition by range (a)
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subpartition by hash (b)
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subpartitions 2
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(partition pnull values less than (0),
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partition p0 values less than (1),
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partition p1 values less than(2));
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insert into t1 values (null,0),(null,1),(0,0),(0,1),(1,0),(1,1);
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select * from t1 where a is null;
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a b
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NULL 0
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NULL 1
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select * from t1 where a >= 0;
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a b
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0 0
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0 1
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1 0
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1 1
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select * from t1 where a < 0;
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a b
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select * from t1 where a <= 0;
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a b
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0 0
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0 1
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select * from t1 where a > 1;
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a b
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explain partitions select * from t1 where a is null;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 pnull_pnullsp0,pnull_pnullsp1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a >= 0;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1 ALL NULL NULL NULL NULL 4 Using where
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explain partitions select * from t1 where a < 0;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 pnull_pnullsp0,pnull_pnullsp1 ALL NULL NULL NULL NULL 2 Using where
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explain partitions select * from t1 where a <= 0;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 pnull_pnullsp0,pnull_pnullsp1,p0_p0sp0,p0_p0sp1 ALL NULL NULL NULL NULL 4 Using where
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explain partitions select * from t1 where a > 1;
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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drop table t1;
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CREATE TABLE t1 (
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a int not null,
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b int not null,
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c int not null,
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primary key(a,b))
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partition by range (a)
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partitions 3
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(partition x1 values less than (5) tablespace ts1,
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partition x2 values less than (10) tablespace ts2,
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partition x3 values less than maxvalue tablespace ts3);
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INSERT into t1 values (1, 1, 1);
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INSERT into t1 values (6, 1, 1);
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INSERT into t1 values (10, 1, 1);
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INSERT into t1 values (15, 1, 1);
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select * from t1;
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a b c
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1 1 1
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6 1 1
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10 1 1
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15 1 1
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) NOT NULL,
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`b` int(11) NOT NULL,
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`c` int(11) NOT NULL,
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PRIMARY KEY (`a`,`b`)
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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PARTITION BY RANGE (`a`)
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(PARTITION `x1` VALUES LESS THAN (5) ENGINE = MyISAM,
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PARTITION `x2` VALUES LESS THAN (10) ENGINE = MyISAM,
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PARTITION `x3` VALUES LESS THAN MAXVALUE ENGINE = MyISAM)
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ALTER TABLE t1
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partition by range (a)
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partitions 3
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(partition x1 values less than (5) tablespace ts1,
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partition x2 values less than (10) tablespace ts2,
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partition x3 values less than maxvalue tablespace ts3);
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select * from t1;
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a b c
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1 1 1
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6 1 1
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10 1 1
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15 1 1
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) NOT NULL,
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`b` int(11) NOT NULL,
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`c` int(11) NOT NULL,
|
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PRIMARY KEY (`a`,`b`)
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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PARTITION BY RANGE (`a`)
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(PARTITION `x1` VALUES LESS THAN (5) ENGINE = MyISAM,
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PARTITION `x2` VALUES LESS THAN (10) ENGINE = MyISAM,
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PARTITION `x3` VALUES LESS THAN MAXVALUE ENGINE = MyISAM)
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drop table if exists t1;
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CREATE TABLE t1 (
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a int not null,
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b int not null,
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c int not null)
|
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partition by range (a)
|
|
partitions 3
|
|
(partition x1 values less than (5) tablespace ts1,
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partition x2 values less than (10) tablespace ts2,
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partition x3 values less than maxvalue tablespace ts3);
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INSERT into t1 values (1, 1, 1);
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INSERT into t1 values (6, 1, 1);
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INSERT into t1 values (10, 1, 1);
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INSERT into t1 values (15, 1, 1);
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select * from t1;
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a b c
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1 1 1
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6 1 1
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10 1 1
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15 1 1
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ALTER TABLE t1
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partition by range (a)
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|
partitions 3
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(partition x1 values less than (5) tablespace ts1,
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partition x2 values less than (10) tablespace ts2,
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partition x3 values less than maxvalue tablespace ts3);
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select * from t1;
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a b c
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1 1 1
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6 1 1
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10 1 1
|
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15 1 1
|
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drop table if exists t1;
|
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CREATE TABLE t1 (
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a int not null,
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|
b int not null,
|
|
c int not null,
|
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primary key(a,b))
|
|
partition by range (a)
|
|
partitions 3
|
|
(partition x1 values less than (5) tablespace ts1,
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|
partition x2 values less than (10) tablespace ts2,
|
|
partition x3 values less than (15) tablespace ts3);
|
|
INSERT into t1 values (1, 1, 1);
|
|
INSERT into t1 values (6, 1, 1);
|
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INSERT into t1 values (10, 1, 1);
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INSERT into t1 values (15, 1, 1);
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ERROR HY000: Table has no partition for value 15
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select * from t1;
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a b c
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1 1 1
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6 1 1
|
|
10 1 1
|
|
ALTER TABLE t1
|
|
partition by range (a)
|
|
partitions 3
|
|
(partition x1 values less than (5) tablespace ts1,
|
|
partition x2 values less than (10) tablespace ts2,
|
|
partition x3 values less than (15) tablespace ts3);
|
|
select * from t1;
|
|
a b c
|
|
1 1 1
|
|
6 1 1
|
|
10 1 1
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
a int not null,
|
|
b int not null,
|
|
c int not null,
|
|
primary key(a,b))
|
|
partition by range (a)
|
|
(partition x1 values less than (1));
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
a int not null,
|
|
b int not null,
|
|
c int not null,
|
|
primary key (a,b))
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11,
|
|
subpartition x12),
|
|
partition x2 values less than (5)
|
|
( subpartition x21,
|
|
subpartition x22)
|
|
);
|
|
SELECT * from t1;
|
|
a b c
|
|
show create table t1;
|
|
Table Create Table
|
|
t1 CREATE TABLE `t1` (
|
|
`a` int(11) NOT NULL,
|
|
`b` int(11) NOT NULL,
|
|
`c` int(11) NOT NULL,
|
|
PRIMARY KEY (`a`,`b`)
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
|
|
PARTITION BY RANGE (`a`)
|
|
SUBPARTITION BY HASH (`a` + `b`)
|
|
(PARTITION `x1` VALUES LESS THAN (1)
|
|
(SUBPARTITION `x11` ENGINE = MyISAM,
|
|
SUBPARTITION `x12` ENGINE = MyISAM),
|
|
PARTITION `x2` VALUES LESS THAN (5)
|
|
(SUBPARTITION `x21` ENGINE = MyISAM,
|
|
SUBPARTITION `x22` ENGINE = MyISAM))
|
|
ALTER TABLE t1 ADD COLUMN d int;
|
|
show create table t1;
|
|
Table Create Table
|
|
t1 CREATE TABLE `t1` (
|
|
`a` int(11) NOT NULL,
|
|
`b` int(11) NOT NULL,
|
|
`c` int(11) NOT NULL,
|
|
`d` int(11) DEFAULT NULL,
|
|
PRIMARY KEY (`a`,`b`)
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
|
|
PARTITION BY RANGE (`a`)
|
|
SUBPARTITION BY HASH (`a` + `b`)
|
|
(PARTITION `x1` VALUES LESS THAN (1)
|
|
(SUBPARTITION `x11` ENGINE = MyISAM,
|
|
SUBPARTITION `x12` ENGINE = MyISAM),
|
|
PARTITION `x2` VALUES LESS THAN (5)
|
|
(SUBPARTITION `x21` ENGINE = MyISAM,
|
|
SUBPARTITION `x22` ENGINE = MyISAM))
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
a int not null,
|
|
b int not null,
|
|
c int not null,
|
|
primary key (a,b))
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11 tablespace t1 engine myisam nodegroup 0,
|
|
subpartition x12 tablespace t2 engine myisam nodegroup 1),
|
|
partition x2 values less than (5)
|
|
( subpartition x21 tablespace t1 engine myisam nodegroup 0,
|
|
subpartition x22 tablespace t2 engine myisam nodegroup 1)
|
|
);
|
|
SELECT * from t1;
|
|
a b c
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
a int not null,
|
|
b int not null,
|
|
c int not null,
|
|
primary key (a,b))
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11 tablespace t1 nodegroup 0,
|
|
subpartition x12 tablespace t2 nodegroup 1),
|
|
partition x2 values less than (5)
|
|
( subpartition x21 tablespace t1 nodegroup 0,
|
|
subpartition x22 tablespace t2 nodegroup 1)
|
|
);
|
|
SELECT * from t1;
|
|
a b c
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
a int not null,
|
|
b int not null,
|
|
c int not null,
|
|
primary key (a,b))
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11 engine myisam nodegroup 0,
|
|
subpartition x12 engine myisam nodegroup 1),
|
|
partition x2 values less than (5)
|
|
( subpartition x21 engine myisam nodegroup 0,
|
|
subpartition x22 engine myisam nodegroup 1)
|
|
);
|
|
INSERT into t1 VALUES (1,1,1);
|
|
INSERT into t1 VALUES (4,1,1);
|
|
INSERT into t1 VALUES (5,1,1);
|
|
ERROR HY000: Table has no partition for value 5
|
|
SELECT * from t1;
|
|
a b c
|
|
1 1 1
|
|
4 1 1
|
|
ALTER TABLE t1
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11 engine myisam nodegroup 0,
|
|
subpartition x12 engine myisam nodegroup 1),
|
|
partition x2 values less than (5)
|
|
( subpartition x21 engine myisam nodegroup 0,
|
|
subpartition x22 engine myisam nodegroup 1)
|
|
);
|
|
SELECT * from t1;
|
|
a b c
|
|
1 1 1
|
|
4 1 1
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
a int not null,
|
|
b int not null,
|
|
c int not null,
|
|
primary key (a,b))
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11 tablespace t1 engine myisam,
|
|
subpartition x12 tablespace t2 engine myisam),
|
|
partition x2 values less than (5)
|
|
( subpartition x21 tablespace t1 engine myisam,
|
|
subpartition x22 tablespace t2 engine myisam)
|
|
);
|
|
INSERT into t1 VALUES (1,1,1);
|
|
INSERT into t1 VALUES (4,1,1);
|
|
INSERT into t1 VALUES (5,1,1);
|
|
ERROR HY000: Table has no partition for value 5
|
|
SELECT * from t1;
|
|
a b c
|
|
1 1 1
|
|
4 1 1
|
|
ALTER TABLE t1
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11 tablespace t1 engine myisam,
|
|
subpartition x12 tablespace t2 engine myisam),
|
|
partition x2 values less than (5)
|
|
( subpartition x21 tablespace t1 engine myisam,
|
|
subpartition x22 tablespace t2 engine myisam)
|
|
);
|
|
SELECT * from t1;
|
|
a b c
|
|
1 1 1
|
|
4 1 1
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
a int not null,
|
|
b int not null,
|
|
c int not null,
|
|
primary key (a,b))
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11 tablespace t1,
|
|
subpartition x12 tablespace t2),
|
|
partition x2 values less than (5)
|
|
( subpartition x21 tablespace t1,
|
|
subpartition x22 tablespace t2)
|
|
);
|
|
INSERT into t1 VALUES (1,1,1);
|
|
INSERT into t1 VALUES (4,1,1);
|
|
INSERT into t1 VALUES (5,1,1);
|
|
ERROR HY000: Table has no partition for value 5
|
|
SELECT * from t1;
|
|
a b c
|
|
1 1 1
|
|
4 1 1
|
|
ALTER TABLE t1
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11 tablespace t1 engine myisam,
|
|
subpartition x12 tablespace t2 engine myisam),
|
|
partition x2 values less than (5)
|
|
( subpartition x21 tablespace t1 engine myisam,
|
|
subpartition x22 tablespace t2 engine myisam)
|
|
);
|
|
SELECT * from t1;
|
|
a b c
|
|
1 1 1
|
|
4 1 1
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
a int not null,
|
|
b int not null,
|
|
c int not null,
|
|
primary key (a,b))
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11 engine myisam,
|
|
subpartition x12 engine myisam),
|
|
partition x2 values less than (5)
|
|
( subpartition x21 engine myisam,
|
|
subpartition x22 engine myisam)
|
|
);
|
|
INSERT into t1 VALUES (1,1,1);
|
|
INSERT into t1 VALUES (4,1,1);
|
|
INSERT into t1 VALUES (5,1,1);
|
|
ERROR HY000: Table has no partition for value 5
|
|
SELECT * from t1;
|
|
a b c
|
|
1 1 1
|
|
4 1 1
|
|
ALTER TABLE t1
|
|
partition by range (a)
|
|
subpartition by hash (a+b)
|
|
( partition x1 values less than (1)
|
|
( subpartition x11 engine myisam,
|
|
subpartition x12 engine myisam),
|
|
partition x2 values less than (5)
|
|
( subpartition x21 engine myisam,
|
|
subpartition x22 engine myisam)
|
|
);
|
|
SELECT * from t1;
|
|
a b c
|
|
1 1 1
|
|
4 1 1
|
|
drop table t1;
|
|
CREATE TABLE t1 (c1 int default NULL, c2 varchar(30) default NULL,
|
|
c3 date default NULL) engine=myisam
|
|
PARTITION BY RANGE (year(c3)) (PARTITION p0 VALUES LESS THAN (1995),
|
|
PARTITION p1 VALUES LESS THAN (1996) , PARTITION p2 VALUES LESS THAN (1997) ,
|
|
PARTITION p3 VALUES LESS THAN (1998) , PARTITION p4 VALUES LESS THAN (1999) ,
|
|
PARTITION p5 VALUES LESS THAN (2000) , PARTITION p6 VALUES LESS THAN (2001) ,
|
|
PARTITION p7 VALUES LESS THAN (2002) , PARTITION p8 VALUES LESS THAN (2003) ,
|
|
PARTITION p9 VALUES LESS THAN (2004) , PARTITION p10 VALUES LESS THAN (2010),
|
|
PARTITION p11 VALUES LESS THAN MAXVALUE );
|
|
INSERT INTO t1 VALUES (1, 'testing partitions', '1995-07-17'),
|
|
(3, 'testing partitions','1995-07-31'),
|
|
(5, 'testing partitions','1995-08-13'),
|
|
(7, 'testing partitions','1995-08-26'),
|
|
(9, 'testing partitions','1995-09-09'),
|
|
(0, 'testing partitions','2000-07-10'),
|
|
(2, 'testing partitions','2000-07-23'),
|
|
(4, 'testing partitions','2000-08-05'),
|
|
(6, 'testing partitions','2000-08-19'),
|
|
(8, 'testing partitions','2000-09-01');
|
|
SELECT COUNT(*) FROM t1 WHERE c3 BETWEEN '1996-12-31' AND '2000-12-31';
|
|
COUNT(*)
|
|
5
|
|
SELECT COUNT(*) FROM t1 WHERE c3 < '2000-12-31';
|
|
COUNT(*)
|
|
10
|
|
DROP TABLE t1;
|
|
create table t1 (a bigint unsigned)
|
|
partition by range (a)
|
|
(partition p0 values less than (10),
|
|
partition p1 values less than (0));
|
|
ERROR HY000: VALUES LESS THAN value must be strictly increasing for each partition
|
|
create table t1 (a bigint unsigned)
|
|
partition by range (a)
|
|
(partition p0 values less than (0),
|
|
partition p1 values less than (10));
|
|
show create table t1;
|
|
Table Create Table
|
|
t1 CREATE TABLE `t1` (
|
|
`a` bigint(20) unsigned DEFAULT NULL
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
|
|
PARTITION BY RANGE (`a`)
|
|
(PARTITION `p0` VALUES LESS THAN (0) ENGINE = MyISAM,
|
|
PARTITION `p1` VALUES LESS THAN (10) ENGINE = MyISAM)
|
|
drop table t1;
|
|
create table t1 (a bigint unsigned)
|
|
partition by range (a)
|
|
(partition p0 values less than (2),
|
|
partition p1 values less than (10));
|
|
show create table t1;
|
|
Table Create Table
|
|
t1 CREATE TABLE `t1` (
|
|
`a` bigint(20) unsigned DEFAULT NULL
|
|
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
|
|
PARTITION BY RANGE (`a`)
|
|
(PARTITION `p0` VALUES LESS THAN (2) ENGINE = MyISAM,
|
|
PARTITION `p1` VALUES LESS THAN (10) ENGINE = MyISAM)
|
|
insert into t1 values (0xFFFFFFFFFFFFFFFF);
|
|
ERROR HY000: Table has no partition for value 18446744073709551615
|
|
drop table t1;
|
|
create table t1 (a int)
|
|
partition by range (MOD(a,3))
|
|
subpartition by hash(a)
|
|
subpartitions 2
|
|
(partition p0 values less than (1),
|
|
partition p1 values less than (2),
|
|
partition p2 values less than (3),
|
|
partition p3 values less than (4));
|
|
ALTER TABLE t1 DROP PARTITION p3;
|
|
ALTER TABLE t1 DROP PARTITION p1;
|
|
ALTER TABLE t1 DROP PARTITION p2;
|
|
drop table t1;
|
|
create table t1 (a int)
|
|
partition by range (MOD(a,3))
|
|
subpartition by hash(a)
|
|
subpartitions 2
|
|
(partition p0 values less than (1),
|
|
partition p1 values less than (2),
|
|
partition p2 values less than (3),
|
|
partition p3 values less than (4));
|
|
ALTER TABLE t1 DROP PARTITION p0;
|
|
ALTER TABLE t1 DROP PARTITION p1;
|
|
ALTER TABLE t1 DROP PARTITION p2;
|
|
drop table t1;
|
|
create table t1 (a int DEFAULT NULL,
|
|
b varchar(30) DEFAULT NULL,
|
|
c date DEFAULT NULL)
|
|
ENGINE=MYISAM DEFAULT CHARSET=latin1;
|
|
insert into t1 values (1, 'abc', '1995-01-01');
|
|
insert into t1 values (1, 'abc', '1995-01-02');
|
|
insert into t1 values (1, 'abc', '1995-01-03');
|
|
insert into t1 values (1, 'abc', '1995-01-04');
|
|
insert into t1 values (1, 'abc', '1995-01-05');
|
|
insert into t1 values (1, 'abc', '1995-01-06');
|
|
insert into t1 values (1, 'abc', '1995-01-07');
|
|
insert into t1 values (1, 'abc', '1995-01-08');
|
|
insert into t1 values (1, 'abc', '1995-01-09');
|
|
insert into t1 values (1, 'abc', '1995-01-10');
|
|
insert into t1 values (1, 'abc', '1995-01-11');
|
|
insert into t1 values (1, 'abc', '1995-01-12');
|
|
insert into t1 values (1, 'abc', '1995-01-13');
|
|
insert into t1 values (1, 'abc', '1995-01-14');
|
|
insert into t1 values (1, 'abc', '1995-01-15');
|
|
insert into t1 values (1, 'abc', '1997-01-01');
|
|
insert into t1 values (1, 'abc', '1997-01-02');
|
|
insert into t1 values (1, 'abc', '1997-01-03');
|
|
insert into t1 values (1, 'abc', '1997-01-04');
|
|
insert into t1 values (1, 'abc', '1997-01-05');
|
|
insert into t1 values (1, 'abc', '1997-01-06');
|
|
insert into t1 values (1, 'abc', '1997-01-07');
|
|
insert into t1 values (1, 'abc', '1997-01-08');
|
|
insert into t1 values (1, 'abc', '1997-01-09');
|
|
insert into t1 values (1, 'abc', '1997-01-10');
|
|
insert into t1 values (1, 'abc', '1997-01-11');
|
|
insert into t1 values (1, 'abc', '1997-01-12');
|
|
insert into t1 values (1, 'abc', '1997-01-13');
|
|
insert into t1 values (1, 'abc', '1997-01-14');
|
|
insert into t1 values (1, 'abc', '1997-01-15');
|
|
insert into t1 values (1, 'abc', '1998-01-01');
|
|
insert into t1 values (1, 'abc', '1998-01-02');
|
|
insert into t1 values (1, 'abc', '1998-01-03');
|
|
insert into t1 values (1, 'abc', '1998-01-04');
|
|
insert into t1 values (1, 'abc', '1998-01-05');
|
|
insert into t1 values (1, 'abc', '1998-01-06');
|
|
insert into t1 values (1, 'abc', '1998-01-07');
|
|
insert into t1 values (1, 'abc', '1998-01-08');
|
|
insert into t1 values (1, 'abc', '1998-01-09');
|
|
insert into t1 values (1, 'abc', '1998-01-10');
|
|
insert into t1 values (1, 'abc', '1998-01-11');
|
|
insert into t1 values (1, 'abc', '1998-01-12');
|
|
insert into t1 values (1, 'abc', '1998-01-13');
|
|
insert into t1 values (1, 'abc', '1998-01-14');
|
|
insert into t1 values (1, 'abc', '1998-01-15');
|
|
insert into t1 values (1, 'abc', '1999-01-01');
|
|
insert into t1 values (1, 'abc', '1999-01-02');
|
|
insert into t1 values (1, 'abc', '1999-01-03');
|
|
insert into t1 values (1, 'abc', '1999-01-04');
|
|
insert into t1 values (1, 'abc', '1999-01-05');
|
|
insert into t1 values (1, 'abc', '1999-01-06');
|
|
insert into t1 values (1, 'abc', '1999-01-07');
|
|
insert into t1 values (1, 'abc', '1999-01-08');
|
|
insert into t1 values (1, 'abc', '1999-01-09');
|
|
insert into t1 values (1, 'abc', '1999-01-10');
|
|
insert into t1 values (1, 'abc', '1999-01-11');
|
|
insert into t1 values (1, 'abc', '1999-01-12');
|
|
insert into t1 values (1, 'abc', '1999-01-13');
|
|
insert into t1 values (1, 'abc', '1999-01-14');
|
|
insert into t1 values (1, 'abc', '1999-01-15');
|
|
insert into t1 values (1, 'abc', '2000-01-01');
|
|
insert into t1 values (1, 'abc', '2000-01-02');
|
|
insert into t1 values (1, 'abc', '2000-01-03');
|
|
insert into t1 values (1, 'abc', '2000-01-04');
|
|
insert into t1 values (1, 'abc', '2000-01-05');
|
|
insert into t1 values (1, 'abc', '2000-01-06');
|
|
insert into t1 values (1, 'abc', '2000-01-07');
|
|
insert into t1 values (1, 'abc', '2000-01-08');
|
|
insert into t1 values (1, 'abc', '2000-01-09');
|
|
insert into t1 values (1, 'abc', '2000-01-15');
|
|
insert into t1 values (1, 'abc', '2000-01-11');
|
|
insert into t1 values (1, 'abc', '2000-01-12');
|
|
insert into t1 values (1, 'abc', '2000-01-13');
|
|
insert into t1 values (1, 'abc', '2000-01-14');
|
|
insert into t1 values (1, 'abc', '2000-01-15');
|
|
insert into t1 values (1, 'abc', '2001-01-01');
|
|
insert into t1 values (1, 'abc', '2001-01-02');
|
|
insert into t1 values (1, 'abc', '2001-01-03');
|
|
insert into t1 values (1, 'abc', '2001-01-04');
|
|
insert into t1 values (1, 'abc', '2001-01-05');
|
|
insert into t1 values (1, 'abc', '2001-01-06');
|
|
insert into t1 values (1, 'abc', '2001-01-07');
|
|
insert into t1 values (1, 'abc', '2001-01-08');
|
|
insert into t1 values (1, 'abc', '2001-01-09');
|
|
insert into t1 values (1, 'abc', '2001-01-15');
|
|
insert into t1 values (1, 'abc', '2001-01-11');
|
|
insert into t1 values (1, 'abc', '2001-01-12');
|
|
insert into t1 values (1, 'abc', '2001-01-13');
|
|
insert into t1 values (1, 'abc', '2001-01-14');
|
|
insert into t1 values (1, 'abc', '2001-01-15');
|
|
alter table t1
|
|
partition by range (year(c))
|
|
(partition p5 values less than (2000), partition p10 values less than (2010));
|
|
alter table t1
|
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reorganize partition p5 into
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(partition p1 values less than (1996),
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partition p2 values less than (1997),
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partition p3 values less than (1998),
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partition p4 values less than (1999),
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partition p5 values less than (2000));
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drop table t1;
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CREATE TABLE t1 (a date)
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PARTITION BY RANGE (TO_DAYS(a))
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(PARTITION p3xx VALUES LESS THAN (TO_DAYS('2004-01-01')),
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PARTITION p401 VALUES LESS THAN (TO_DAYS('2004-02-01')),
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PARTITION p402 VALUES LESS THAN (TO_DAYS('2004-03-01')),
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PARTITION p403 VALUES LESS THAN (TO_DAYS('2004-04-01')),
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PARTITION p404 VALUES LESS THAN (TO_DAYS('2004-05-01')),
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PARTITION p405 VALUES LESS THAN (TO_DAYS('2004-06-01')),
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PARTITION p406 VALUES LESS THAN (TO_DAYS('2004-07-01')),
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PARTITION p407 VALUES LESS THAN (TO_DAYS('2004-08-01')),
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PARTITION p408 VALUES LESS THAN (TO_DAYS('2004-09-01')),
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PARTITION p409 VALUES LESS THAN (TO_DAYS('2004-10-01')),
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PARTITION p410 VALUES LESS THAN (TO_DAYS('2004-11-01')),
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PARTITION p411 VALUES LESS THAN (TO_DAYS('2004-12-01')),
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PARTITION p412 VALUES LESS THAN (TO_DAYS('2005-01-01')),
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PARTITION p501 VALUES LESS THAN (TO_DAYS('2005-02-01')),
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PARTITION p502 VALUES LESS THAN (TO_DAYS('2005-03-01')),
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PARTITION p503 VALUES LESS THAN (TO_DAYS('2005-04-01')),
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PARTITION p504 VALUES LESS THAN (TO_DAYS('2005-05-01')),
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PARTITION p505 VALUES LESS THAN (TO_DAYS('2005-06-01')),
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PARTITION p506 VALUES LESS THAN (TO_DAYS('2005-07-01')),
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PARTITION p507 VALUES LESS THAN (TO_DAYS('2005-08-01')),
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PARTITION p508 VALUES LESS THAN (TO_DAYS('2005-09-01')),
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PARTITION p509 VALUES LESS THAN (TO_DAYS('2005-10-01')),
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PARTITION p510 VALUES LESS THAN (TO_DAYS('2005-11-01')),
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PARTITION p511 VALUES LESS THAN (TO_DAYS('2005-12-01')),
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PARTITION p512 VALUES LESS THAN (TO_DAYS('2006-01-01')),
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PARTITION p601 VALUES LESS THAN (TO_DAYS('2006-02-01')),
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PARTITION p602 VALUES LESS THAN (TO_DAYS('2006-03-01')),
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PARTITION p603 VALUES LESS THAN (TO_DAYS('2006-04-01')),
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PARTITION p604 VALUES LESS THAN (TO_DAYS('2006-05-01')),
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PARTITION p605 VALUES LESS THAN (TO_DAYS('2006-06-01')),
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PARTITION p606 VALUES LESS THAN (TO_DAYS('2006-07-01')),
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PARTITION p607 VALUES LESS THAN (TO_DAYS('2006-08-01')));
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INSERT INTO t1 VALUES ('2003-01-13'),('2003-06-20'),('2003-08-30');
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INSERT INTO t1 VALUES ('2003-04-13'),('2003-07-20'),('2003-10-30');
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INSERT INTO t1 VALUES ('2003-05-13'),('2003-11-20'),('2003-12-30');
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INSERT INTO t1 VALUES ('2004-01-13'),('2004-01-20'),('2004-01-30');
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INSERT INTO t1 VALUES ('2004-02-13'),('2004-02-20'),('2004-02-28');
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INSERT INTO t1 VALUES ('2004-03-13'),('2004-03-20'),('2004-03-30');
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INSERT INTO t1 VALUES ('2004-04-13'),('2004-04-20'),('2004-04-30');
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INSERT INTO t1 VALUES ('2004-05-13'),('2004-05-20'),('2004-05-30');
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INSERT INTO t1 VALUES ('2004-06-13'),('2004-06-20'),('2004-06-30');
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INSERT INTO t1 VALUES ('2004-07-13'),('2004-07-20'),('2004-07-30');
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INSERT INTO t1 VALUES ('2004-08-13'),('2004-08-20'),('2004-08-30');
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INSERT INTO t1 VALUES ('2004-09-13'),('2004-09-20'),('2004-09-30');
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INSERT INTO t1 VALUES ('2004-10-13'),('2004-10-20'),('2004-10-30');
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INSERT INTO t1 VALUES ('2004-11-13'),('2004-11-20'),('2004-11-30');
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INSERT INTO t1 VALUES ('2004-12-13'),('2004-12-20'),('2004-12-30');
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INSERT INTO t1 VALUES ('2005-01-13'),('2005-01-20'),('2005-01-30');
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INSERT INTO t1 VALUES ('2005-02-13'),('2005-02-20'),('2005-02-28');
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INSERT INTO t1 VALUES ('2005-03-13'),('2005-03-20'),('2005-03-30');
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INSERT INTO t1 VALUES ('2005-04-13'),('2005-04-20'),('2005-04-30');
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INSERT INTO t1 VALUES ('2005-05-13'),('2005-05-20'),('2005-05-30');
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INSERT INTO t1 VALUES ('2005-06-13'),('2005-06-20'),('2005-06-30');
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INSERT INTO t1 VALUES ('2005-07-13'),('2005-07-20'),('2005-07-30');
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INSERT INTO t1 VALUES ('2005-08-13'),('2005-08-20'),('2005-08-30');
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INSERT INTO t1 VALUES ('2005-09-13'),('2005-09-20'),('2005-09-30');
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INSERT INTO t1 VALUES ('2005-10-13'),('2005-10-20'),('2005-10-30');
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INSERT INTO t1 VALUES ('2005-11-13'),('2005-11-20'),('2005-11-30');
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INSERT INTO t1 VALUES ('2005-12-13'),('2005-12-20'),('2005-12-30');
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INSERT INTO t1 VALUES ('2006-01-13'),('2006-01-20'),('2006-01-30');
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INSERT INTO t1 VALUES ('2006-02-13'),('2006-02-20'),('2006-02-28');
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INSERT INTO t1 VALUES ('2006-03-13'),('2006-03-20'),('2006-03-30');
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INSERT INTO t1 VALUES ('2006-04-13'),('2006-04-20'),('2006-04-30');
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INSERT INTO t1 VALUES ('2006-05-13'),('2006-05-20'),('2006-05-30');
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INSERT INTO t1 VALUES ('2006-06-13'),('2006-06-20'),('2006-06-30');
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INSERT INTO t1 VALUES ('2006-07-13'),('2006-07-20'),('2006-07-30');
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SELECT * FROM t1
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WHERE a >= '2004-07-01' AND a <= '2004-09-30';
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a
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2004-07-13
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2004-07-20
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2004-07-30
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2004-08-13
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2004-08-20
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2004-08-30
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2004-09-13
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2004-09-20
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2004-09-30
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EXPLAIN PARTITIONS SELECT * FROM t1
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WHERE a >= '2004-07-01' AND a <= '2004-09-30';
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p3xx,p407,p408,p409 ALL NULL NULL NULL NULL 18 Using where
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SELECT * from t1
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WHERE (a >= '2004-07-01' AND a <= '2004-09-30') OR
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(a >= '2005-07-01' AND a <= '2005-09-30');
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a
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2004-07-13
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2004-07-20
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2004-07-30
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2004-08-13
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2004-08-20
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2004-08-30
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2004-09-13
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2004-09-20
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2004-09-30
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2005-07-13
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2005-07-20
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2005-07-30
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2005-08-13
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2005-08-20
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2005-08-30
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2005-09-13
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2005-09-20
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2005-09-30
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EXPLAIN PARTITIONS SELECT * from t1
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WHERE (a >= '2004-07-01' AND a <= '2004-09-30') OR
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(a >= '2005-07-01' AND a <= '2005-09-30');
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id select_type table partitions type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 p3xx,p407,p408,p409,p507,p508,p509 ALL NULL NULL NULL NULL 27 Using where
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DROP TABLE t1;
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create table t1 (a int);
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insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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CREATE TABLE t2 (
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defid int(10) unsigned NOT NULL,
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day int(10) unsigned NOT NULL,
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count int(10) unsigned NOT NULL,
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filler char(200),
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KEY (defid,day)
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)
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PARTITION BY RANGE (day) (
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PARTITION p7 VALUES LESS THAN (20070401) ,
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PARTITION p8 VALUES LESS THAN (20070501));
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insert into t2 select 20, 20070311, 1, 'filler' from t1 A, t1 B;
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insert into t2 select 20, 20070411, 1, 'filler' from t1 A, t1 B;
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insert into t2 values(52, 20070321, 123, 'filler') ;
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insert into t2 values(52, 20070322, 456, 'filler') ;
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select sum(count) from t2 ch where ch.defid in (50,52) and ch.day between 20070320 and 20070401 group by defid;
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sum(count)
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579
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drop table t1, t2;
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#
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# Bug#50939: Loose Index Scan unduly relies on engine to remember range
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# endpoints
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#
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CREATE TABLE t1 (
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a INT,
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b INT,
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KEY ( a, b )
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);
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CREATE TABLE t1_part (
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a INT,
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b INT,
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KEY ( a, b )
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) PARTITION BY HASH (a) PARTITIONS 1;
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CREATE TABLE t2 (
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a INT,
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b INT,
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KEY ( a, b )
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);
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INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4), (5, 5);
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INSERT INTO t1 SELECT a + 5, b + 5 FROM t1;
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INSERT INTO t1 SELECT a + 10, b + 10 FROM t1;
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INSERT INTO t1 SELECT a + 20, b + 20 FROM t1;
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INSERT INTO t1 SELECT a + 40, b + 40 FROM t1;
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INSERT INTO t1 values(10,0),(10,1),(10,2),(100,0),(100,1);
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select count(*) from t1;
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count(*)
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85
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select count(*) from t1 where a=10;
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count(*)
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4
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select count(*) from t1 where a=100;
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count(*)
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2
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INSERT INTO t1_part SELECT * FROM t1;
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INSERT INTO t2 SELECT * FROM t1;
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ANALYZE TABLE t1_part,t2;
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Table Op Msg_type Msg_text
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test.t1_part analyze status Engine-independent statistics collected
|
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test.t1_part analyze status OK
|
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test.t2 analyze status Engine-independent statistics collected
|
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test.t2 analyze status Table is already up to date
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# plans should be identical
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EXPLAIN SELECT a, MAX(b) FROM t1_part WHERE a IN (10,100) GROUP BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1_part range a a 5 NULL 2 Using where; Using index for group-by
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EXPLAIN SELECT a, MAX(b) FROM t2 WHERE a IN (10,100) GROUP BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 range a a 5 NULL 2 Using where; Using index for group-by
|
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FLUSH status;
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SELECT a, MAX(b) FROM t1_part WHERE a IN (10, 100) GROUP BY a;
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a MAX(b)
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10 10
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100 1
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SHOW status LIKE 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 6
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Handler_read_last 1
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_retry 0
|
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
|
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FLUSH status;
|
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SELECT a, MAX(b) FROM t2 WHERE a IN (10, 100) GROUP BY a;
|
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a MAX(b)
|
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10 10
|
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100 1
|
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SHOW status LIKE 'handler_read%';
|
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Variable_name Value
|
|
Handler_read_first 0
|
|
Handler_read_key 6
|
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Handler_read_last 1
|
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Handler_read_next 0
|
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Handler_read_prev 0
|
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Handler_read_retry 0
|
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Handler_read_rnd 0
|
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Handler_read_rnd_deleted 0
|
|
Handler_read_rnd_next 0
|
|
insert into t2 select 100,seq from seq_1_to_100;
|
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EXPLAIN SELECT a, MAX(b) FROM t2 WHERE a IN (10,100) GROUP BY a;
|
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id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 range a a 5 NULL 2 Using where; Using index for group-by
|
|
DROP TABLE t1,t1_part,t2;
|
|
#
|
|
# MDEV-18501 Partition pruning doesn't work for historical queries
|
|
#
|
|
set time_zone= '+00:00';
|
|
create or replace table t1 (d datetime(6))
|
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partition by range (unix_timestamp(d)) (
|
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partition p0 values less than (1),
|
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partition p1 values less than (maxvalue));
|
|
ERROR HY000: Constant, random or timezone-dependent expressions in (sub)partitioning function are not allowed
|
|
# DECIMAL functions are now allowed, partitioning is done by integer part
|
|
create or replace table t1 (d timestamp(6))
|
|
partition by range (unix_timestamp(d)) (
|
|
partition p0 values less than (946684801),
|
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partition p1 values less than (maxvalue));
|
|
insert into t1 values
|
|
# go to p0
|
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('2000-01-01 00:00:00'),
|
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('2000-01-01 00:00:00.000001'),
|
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# goes to p1
|
|
('2000-01-01 00:00:01');
|
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select * from t1 partition (p0);
|
|
d
|
|
2000-01-01 00:00:00.000000
|
|
2000-01-01 00:00:00.000001
|
|
select * from t1 partition (p1);
|
|
d
|
|
2000-01-01 00:00:01.000000
|
|
DROP TABLE t1;
|
|
#
|
|
# MDEV-21195 INSERT chooses wrong partition for RANGE partitioning by DECIMAL column
|
|
#
|
|
create or replace table t (
|
|
d decimal(2,1)) partition by range (d)
|
|
(partition p1 values less than (10));
|
|
insert into t values (9.9);
|
|
create or replace table t (
|
|
d decimal(2,1)) partition by range (d)
|
|
(partition p1 values less than (10),
|
|
partition p2 values less than (20));
|
|
insert into t values (9.9);
|
|
select * from t partition (p1);
|
|
d
|
|
9.9
|
|
select * from t partition (p2);
|
|
d
|
|
create or replace table t (
|
|
d decimal(2,1)) partition by range (d)
|
|
(partition p1 values less than (-3));
|
|
insert into t values (-3.3);
|
|
create or replace table t (
|
|
d decimal(2,1)) partition by range (d+1)
|
|
(partition p1 values less than (10),
|
|
partition p2 values less than (20));
|
|
insert into t values (8.9);
|
|
select * from t partition (p1);
|
|
d
|
|
8.9
|
|
select * from t partition (p2);
|
|
d
|
|
set time_zone='+00:00';
|
|
create or replace table t (
|
|
d timestamp(1)) partition by range (unix_timestamp(d))
|
|
(partition p1 values less than (1577836800),
|
|
partition p2 values less than (2000000000));
|
|
insert into t values (from_unixtime(1577836799.9));
|
|
select * from t partition (p1);
|
|
d
|
|
2019-12-31 23:59:59.9
|
|
select * from t partition (p2);
|
|
d
|
|
set time_zone=default;
|
|
drop table t;
|