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189 lines
6.9 KiB
Text
189 lines
6.9 KiB
Text
#
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# Test of optimizer_costs
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#
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--source include/have_innodb.inc
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--source include/have_sequence.inc
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select table_name,engine from information_schema.tables where table_name="optimizer_costs";
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show create table information_schema.optimizer_costs;
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let $start_engines=`select count(*) from information_schema.optimizer_costs`;
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--vertical_results
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select * from information_schema.optimizer_costs where engine in
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("memory","innodb","aria","default") order by engine;
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--horizontal_results
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show variables like "optimizer%cost";
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show variables like "optimizer_disk_read_ratio";
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--echo #
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--echo # Test change some 'default' variables
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--echo #
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SELECT @@optimizer_disk_read_ratio,@@optimizer_index_block_copy_cost;
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SET global optimizer_disk_read_ratio=0.8;
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SET global optimizer_index_block_copy_cost=0.1;
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SELECT @@optimizer_disk_read_ratio,@@optimizer_index_block_copy_cost;
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select optimizer_disk_read_ratio,optimizer_index_block_copy_cost from information_schema.optimizer_costs where engine='default';
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SET global optimizer_disk_read_ratio=default;
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SET global optimizer_index_block_copy_cost=default;
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SELECT @@optimizer_disk_read_ratio,@@optimizer_index_block_copy_cost;
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--echo #
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--echo # Test change some 'engine' variables
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--echo #
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select @@MEMORY.optimizer_row_lookup_cost;
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set @tmp=@@MEMORY.optimizer_row_lookup_cost;
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set @@global.MEMORY.optimizer_row_lookup_cost=1;
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select @@MEMORY.optimizer_row_lookup_cost;
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set @@global.MEMORY.optimizer_row_lookup_cost=default;
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select @@MEMORY.optimizer_row_lookup_cost;
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set @@global.MEMORY.optimizer_row_lookup_cost=@tmp;
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select @@MEMORY.optimizer_row_lookup_cost;
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--echo #
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--echo # Print variables with different syntaxes
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--echo #
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SHOW VARIABLES like "optimizer_row_lookup_cost";
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SELECT @@optimizer_row_lookup_cost;
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SELECT @@global.default.optimizer_row_lookup_cost;
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SELECT @@global.default.`optimizer_row_lookup_cost`;
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SELECT @@MEMORY.optimizer_row_lookup_cost;
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SELECT @@memory.optimizer_row_lookup_cost;
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SELECT @@InnoDB.optimizer_row_lookup_cost;
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--echo #
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--echo # Accessing not existing cost
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--echo #
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SELECT @@not_existing.optimizer_row_lookup_cost;
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SELECT @@NOT_existing.optimizer_row_lookup_cost;
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select engine from information_schema.optimizer_costs where engine like '%existing';
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--echo #
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--echo # Creating a new cost structure
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--echo #
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SET global new_engine.optimizer_disk_read_cost=100;
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select * from information_schema.optimizer_costs where engine like 'new_engine';
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select @@new_engine.optimizer_disk_read_cost, @@new_engine.optimizer_row_copy_cost;
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--echo #
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--echo # Errors
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--echo #
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--error ER_PARSE_ERROR
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SELECT @@default.optimizer_disk_read_cost;
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--error ER_WRONG_TYPE_FOR_VAR
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set global Aria.optimizer_disk_read_cost=NULL;
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set @tmp=@@Aria.optimizer_disk_read_cost;
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SET global Aria.optimizer_disk_read_cost=-1;
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select @@Aria.optimizer_disk_read_cost;
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SET global Aria.optimizer_disk_read_cost=200000;
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select @@Aria.optimizer_disk_read_cost;
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set global Aria.optimizer_disk_read_cost=@tmp;
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select @@Aria.optimizer_disk_read_cost;
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--echo #
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--echo # Test of cost of ref compared to table scan + join_cache
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--echo #
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create or replace table t1 (p int primary key, a char(10)) engine=myisam;
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create or replace table t2 (p int primary key, i int, a char(10), key k2(a)) engine=myisam;
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insert into t2 select seq,seq,'a' from seq_1_to_512;
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insert into t1 select seq,'a' from seq_1_to_4;
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explain select count(*) from t1, t2 where t1.p = t2.i;
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insert into t1 select seq,'a' from seq_5_to_10;
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explain select count(*) from t1, t2 where t1.p = t2.i;
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drop table t1,t2;
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--echo #
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--echo # Test of optimizer_scan_setup_cost
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--echo #
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create table t1 (p int primary key, a char(10)) engine=myisam;
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create table t2 (p int primary key, i int, a char(10), key k1(i), key k2(a)) engine=myisam;
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insert into t1 values (2, 'qqqq'), (11, 'yyyy');
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insert into t2 values (1, 2, 'qqqq'), (2, 2, 'pppp'),
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(3, 2, 'yyyy'), (4, 3, 'zzzz');
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set @org_myisam_disk_read_ratio=@@myisam.optimizer_disk_read_ratio;
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set @@optimizer_scan_setup_cost=10,@@global.myisam.optimizer_disk_read_ratio=0.2;
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flush tables;
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explain select sum(t2.p+length(t1.a)) from t1, t2 where t1.p = t2.i;
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set @@optimizer_scan_setup_cost=0.0, @@global.myisam.optimizer_disk_read_ratio=0.0;
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flush tables;
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explain select sum(t2.p+length(t1.a)) from t1, t2 where t1.p = t2.i;
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set @@optimizer_scan_setup_cost=default,@@global.myisam.optimizer_disk_read_ratio=@org_myisam_disk_read_ratio;
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flush tables;
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drop table t1,t2;
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--echo #
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--echo # Test of group by optimization
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--echo #
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set @@optimizer_scan_setup_cost=0;
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CREATE TABLE t1 (id INT NOT NULL, a DATE, KEY(id,a)) engine=myisam;
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INSERT INTO t1 values (1,'2001-01-01'),(1,'2001-01-02'),
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(1,'2001-01-03'),(1,'2001-01-04'),
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(2,'2001-01-01'),(2,'2001-01-02'),
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(2,'2001-01-03'),(2,'2001-01-04'),
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(3,'2001-01-01'),(3,'2001-01-02'),
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(3,'2001-01-03'),(3,'2001-01-04'),
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(4,'2001-01-01'),(4,'2001-01-02'),
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(4,'2001-01-03'),(4,'2001-01-04');
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analyze table t1;
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EXPLAIN SELECT id,MIN(a),MAX(a) FROM t1 WHERE a>=20010104e0 GROUP BY id;
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insert into t1 values (3,'2001-01-03'),(3,'2001-01-04');
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insert into t1 values (3,'2001-01-03'),(3,'2001-01-04');
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insert into t1 values (3,'2001-01-03'),(3,'2001-01-04');
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insert into t1 values (3,'2001-01-03'),(3,'2001-01-04');
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analyze table t1;
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EXPLAIN SELECT id,MIN(a),MAX(a) FROM t1 WHERE a>=20010104e0 GROUP BY id;
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drop table t1;
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set @@optimizer_scan_setup_cost=default;
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--echo #
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--echo # Test of straight join costs
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--echo #
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create table t1 (l_orderkey int(11) NOT NULL,
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l_partkey int(11) DEFAULT NULL,
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l_suppkey int(11) DEFAULT NULL,
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PRIMARY KEY (l_orderkey)) engine=aria;
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insert into t1 select seq,seq,seq from seq_1_to_1000;
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explain select straight_join count(*) from seq_1_to_10000,t1 where seq=l_orderkey;
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show status like "last_query_cost";
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set @org_cost=@@aria.optimizer_key_next_find_cost;
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# Set cost for t1 high so that we cannot use it for index scans
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set global aria.optimizer_key_next_find_cost=1000;
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flush tables;
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explain select count(*) from seq_1_to_10000,t1 where seq=l_orderkey;
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show status like "last_query_cost";
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set global aria.optimizer_key_next_find_cost=@org_cost;
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drop table t1;
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--echo #
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--echo # Testing distinct group optimization
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--echo #
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create table t1 (a int, b int, key(a,b));
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insert into t1 select seq,seq from seq_1_to_1000;
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explain select count(distinct a,b) from t1;
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explain select count(distinct a,b) from t1 where a>100;
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explain select count(distinct a,b) from t1 where a>800;
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update t1 set a=mod(a,10);
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analyze table t1;
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explain select count(distinct a,b) from t1;
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explain select count(distinct a,b) from t1 where a>1;
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explain select count(distinct a,b) from t1 where a>8;
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update t1 set b=mod(b,2);
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analyze table t1;
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explain select count(distinct a,b) from t1;
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explain select count(distinct a,b) from t1 where a>1;
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explain select count(distinct a,b) from t1 where a>8;
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drop table t1;
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--echo #
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--echo # cleanup
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--echo #
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let $end_engines=`select count(*) from information_schema.optimizer_costs`;
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let $diff=`select $end_engines - $start_engines`;
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--echo "New cost structures: $diff (should be 1)"
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