mirror of
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658128af43
This patch contains a full implementation of the optimization
that allows to use in-memory rowid / primary filters built for range
conditions over indexes. In many cases usage of such filters reduce
the number of disk seeks spent for fetching table rows.
In this implementation the choice of what possible filter to be applied
(if any) is made purely on cost-based considerations.
This implementation re-achitectured the partial implementation of
the feature pushed by Galina Shalygina in the commit
8d5a11122c.
Besides this patch contains a better implementation of the generic
handler function handler::multi_range_read_info_const() that
takes into account gaps between ranges when calculating the cost of
range index scans. It also contains some corrections of the
implementation of the handler function records_in_range() for MyISAM.
This patch supports the feature for InnoDB and MyISAM.
312 lines
15 KiB
Text
312 lines
15 KiB
Text
set @innodb_stats_persistent_save= @@innodb_stats_persistent;
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set @innodb_stats_persistent_sample_pages_save=
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@@innodb_stats_persistent_sample_pages;
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set global innodb_stats_persistent= 1;
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set global innodb_stats_persistent_sample_pages=100;
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drop view if exists v1;
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drop table if exists t1,t4;
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create table t4 (
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pk_col int auto_increment primary key, a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(64) default ' '
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) engine=innodb;
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insert into t4 (a1, a2, b, c, d) values
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('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
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('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
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('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
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('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
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('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
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('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
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('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
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('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
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('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
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('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
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('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
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('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
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('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
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('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
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('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
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('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'),
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('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
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('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
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('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
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('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
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('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
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('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
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('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
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('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
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('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
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('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
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('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
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('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
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('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
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('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
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('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
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('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4');
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create index idx12672_0 on t4 (a1);
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create index idx12672_1 on t4 (a1,a2,b,c);
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create index idx12672_2 on t4 (a1,a2,b);
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analyze table t4;
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Table Op Msg_type Msg_text
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test.t4 analyze status OK
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select distinct a1 from t4 where pk_col not in (1,2,3,4);
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a1
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a
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b
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c
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d
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drop table t4;
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create table t1 (
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a varchar(30), b varchar(30), primary key(a), key(b)
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) engine=innodb;
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select distinct a from t1;
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a
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drop table t1;
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create table t1(a int, key(a)) engine=innodb;
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insert into t1 values(1);
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select a, count(a) from t1 group by a with rollup;
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a count(a)
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1 1
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NULL 1
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drop table t1;
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create table t1 (f1 int, f2 char(1), primary key(f1,f2)) engine=innodb;
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insert into t1 values ( 1,"e"),(2,"a"),( 3,"c"),(4,"d");
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alter table t1 drop primary key, add primary key (f2, f1);
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explain select distinct f1 a, f1 b from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL PRIMARY 5 NULL 4 Using index; Using temporary
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explain select distinct f1, f2 from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL PRIMARY 5 NULL 4 Using index
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drop table t1;
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create table t1(pk int primary key) engine=innodb;
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create view v1 as select pk from t1 where pk < 20;
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insert into t1 values (1), (2), (3), (4);
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select distinct pk from v1;
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pk
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1
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2
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3
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4
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insert into t1 values (5), (6), (7);
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select distinct pk from v1;
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pk
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1
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2
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3
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4
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5
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6
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7
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drop view v1;
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drop table t1;
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End of 5.1 tests
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#
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# Bug#12540545 61101: ASSERTION FAILURE IN THREAD 1256741184 IN
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# FILE /BUILDDIR/BUILD/BUILD/MYSQ
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#
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CREATE TABLE t1 (a CHAR(1), b CHAR(1), PRIMARY KEY (a,b)) ENGINE=InnoDB;
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INSERT INTO t1 VALUES ('a', 'b'), ('c', 'd');
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EXPLAIN SELECT COUNT(DISTINCT a) FROM t1 WHERE b = 'b';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL PRIMARY 2 NULL 2 Using where; Using index
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SELECT COUNT(DISTINCT a) FROM t1 WHERE b = 'b';
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COUNT(DISTINCT a)
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1
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DROP TABLE t1;
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CREATE TABLE t1 (a CHAR(1) NOT NULL, b CHAR(1) NOT NULL, UNIQUE KEY (a,b))
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ENGINE=InnoDB;
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INSERT INTO t1 VALUES ('a', 'b'), ('c', 'd');
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EXPLAIN SELECT COUNT(DISTINCT a) FROM t1 WHERE b = 'b';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL a 2 NULL 2 Using where; Using index
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SELECT COUNT(DISTINCT a) FROM t1 WHERE b = 'b';
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COUNT(DISTINCT a)
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1
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DROP TABLE t1;
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End of 5.5 tests
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#
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# Bug#17909656 - WRONG RESULTS FOR A SIMPLE QUERY WITH GROUP BY
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#
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CREATE TABLE t0 (
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i1 INTEGER NOT NULL
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);
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INSERT INTO t0 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),
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(11),(12),(13),(14),(15),(16),(17),(18),(19),(20),
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(21),(22),(23),(24),(25),(26),(27),(28),(29),(30);
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CREATE TABLE t1 (
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c1 CHAR(1) NOT NULL,
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i1 INTEGER NOT NULL,
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i2 INTEGER NOT NULL,
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UNIQUE KEY k1 (c1,i2)
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) ENGINE=InnoDB;
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INSERT INTO t1 SELECT 'A',i1,i1 FROM t0;
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INSERT INTO t1 SELECT 'B',i1,i1 FROM t0;
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INSERT INTO t1 SELECT 'C',i1,i1 FROM t0;
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INSERT INTO t1 SELECT 'D',i1,i1 FROM t0;
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INSERT INTO t1 SELECT 'E',i1,i1 FROM t0;
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INSERT INTO t1 SELECT 'F',i1,i1 FROM t0;
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CREATE TABLE t2 (
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c1 CHAR(1) NOT NULL,
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i1 INTEGER NOT NULL,
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i2 INTEGER NOT NULL,
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UNIQUE KEY k2 (c1,i1,i2)
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) ENGINE=InnoDB;
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INSERT INTO t2 SELECT 'A',i1,i1 FROM t0;
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INSERT INTO t2 SELECT 'B',i1,i1 FROM t0;
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INSERT INTO t2 SELECT 'C',i1,i1 FROM t0;
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INSERT INTO t2 SELECT 'D',i1,i1 FROM t0;
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INSERT INTO t2 SELECT 'E',i1,i1 FROM t0;
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INSERT INTO t2 SELECT 'F',i1,i1 FROM t0;
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ANALYZE TABLE t1;
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ANALYZE TABLE t2;
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EXPLAIN SELECT c1, max(i2) FROM t1 WHERE (c1 = 'C' AND i2 = 17) OR ( c1 = 'F')
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GROUP BY c1;
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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 k1 k1 5 NULL 31 Using where; Using index
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SELECT c1, max(i2) FROM t1 WHERE (c1 = 'C' AND i2 = 17) OR ( c1 = 'F')
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GROUP BY c1;
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c1 max(i2)
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C 17
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F 30
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EXPLAIN SELECT c1, max(i2) FROM t1 WHERE (c1 = 'C' OR ( c1 = 'F' AND i2 = 17))
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GROUP BY c1;
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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 k1 k1 5 NULL 31 Using where; Using index
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SELECT c1, max(i2) FROM t1 WHERE (c1 = 'C' OR ( c1 = 'F' AND i2 = 17))
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GROUP BY c1;
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c1 max(i2)
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C 30
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F 17
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EXPLAIN SELECT c1, max(i2) FROM t1 WHERE (c1 = 'C' OR c1 = 'F' ) AND ( i2 = 17 )
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GROUP BY c1;
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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 k1 k1 5 NULL 1 Using where; Using index for group-by
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SELECT c1, max(i2) FROM t1 WHERE (c1 = 'C' OR c1 = 'F' ) AND ( i2 = 17 )
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GROUP BY c1;
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c1 max(i2)
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C 17
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F 17
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EXPLAIN SELECT c1, max(i2) FROM t1
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WHERE ((c1 = 'C' AND (i2 = 40 OR i2 = 30)) OR ( c1 = 'F' AND (i2 = 40 )))
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GROUP BY c1;
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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 k1 k1 5 NULL 3 Using where; Using index
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SELECT c1, max(i2) FROM t1
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WHERE ((c1 = 'C' AND (i2 = 40 OR i2 = 30)) OR ( c1 = 'F' AND (i2 = 40 )))
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GROUP BY c1;
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c1 max(i2)
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C 30
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EXPLAIN SELECT c1, i1, max(i2) FROM t2
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WHERE (c1 = 'C' OR ( c1 = 'F' AND i1 < 35)) AND ( i2 = 17 )
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GROUP BY c1,i1;
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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 k2 k2 9 NULL 60 Using where; Using index for group-by
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SELECT c1, i1, max(i2) FROM t2
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WHERE (c1 = 'C' OR ( c1 = 'F' AND i1 < 35)) AND ( i2 = 17 )
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GROUP BY c1,i1;
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c1 i1 max(i2)
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C 17 17
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F 17 17
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EXPLAIN SELECT c1, i1, max(i2) FROM t2
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WHERE (((c1 = 'C' AND i1 < 40) OR ( c1 = 'F' AND i1 < 35)) AND ( i2 = 17 ))
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GROUP BY c1,i1;
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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 k2 k2 9 NULL 60 Using where; Using index for group-by
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SELECT c1, i1, max(i2) FROM t2
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WHERE (((c1 = 'C' AND i1 < 40) OR ( c1 = 'F' AND i1 < 35)) AND ( i2 = 17 ))
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GROUP BY c1,i1;
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c1 i1 max(i2)
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C 17 17
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F 17 17
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EXPLAIN SELECT c1, i1, max(i2) FROM t2
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WHERE ((c1 = 'C' AND i1 < 40) OR ( c1 = 'F' AND i1 < 35) OR ( i2 = 17 ))
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GROUP BY c1,i1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 index k2 k2 9 NULL 180 Using where; Using index
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SELECT c1, i1, max(i2) FROM t2
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WHERE ((c1 = 'C' AND i1 < 40) OR ( c1 = 'F' AND i1 < 35) OR ( i2 = 17 ))
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GROUP BY c1,i1;
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c1 i1 max(i2)
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A 17 17
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B 17 17
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C 1 1
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C 2 2
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C 3 3
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C 4 4
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C 5 5
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C 6 6
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C 7 7
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C 8 8
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C 9 9
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C 10 10
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C 11 11
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C 12 12
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C 13 13
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C 14 14
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C 15 15
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C 16 16
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C 17 17
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C 18 18
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C 19 19
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C 20 20
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C 21 21
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C 22 22
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C 23 23
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C 24 24
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C 25 25
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C 26 26
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C 27 27
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C 28 28
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C 29 29
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C 30 30
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D 17 17
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E 17 17
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F 1 1
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F 2 2
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F 3 3
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F 4 4
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F 5 5
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F 6 6
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F 7 7
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F 8 8
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F 9 9
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F 10 10
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F 11 11
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F 12 12
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F 13 13
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F 14 14
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F 15 15
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F 16 16
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F 17 17
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F 18 18
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F 19 19
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F 20 20
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F 21 21
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F 22 22
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F 23 23
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F 24 24
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F 25 25
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F 26 26
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F 27 27
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F 28 28
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F 29 29
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F 30 30
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DROP TABLE t0,t1,t2;
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#
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# MDEV-MariaDB daemon leaks memory with specific query
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#
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CREATE TABLE t1 (`voter_id` int(11) unsigned NOT NULL,
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`language_id` int(11) unsigned NOT NULL DEFAULT '1'
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) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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CREATE TABLE t2 (`voter_id` int(10) unsigned NOT NULL DEFAULT '0',
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`serialized_c` mediumblob) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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insert into t2 values (1,repeat("a",1000)),(2,repeat("a",1000)),(3,repeat("b",1000)),(4,repeat("c",1000)),(4,repeat("b",1000));
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SELECT GROUP_CONCAT(t1.language_id SEPARATOR ',') AS `translation_resources`, `d`.`serialized_c` FROM t2 AS `d` LEFT JOIN t1 ON `d`.`voter_id` = t1.`voter_id` GROUP BY `d`.`voter_id` ORDER BY 10-d.voter_id+RAND()*0;
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translation_resources serialized_c
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NULL cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
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NULL bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
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NULL aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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NULL aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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drop table t1,t2;
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set global innodb_stats_persistent= @innodb_stats_persistent_save;
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set global innodb_stats_persistent_sample_pages=
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@innodb_stats_persistent_sample_pages_save;
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