142 lines
6.6 KiB
Plaintext
142 lines
6.6 KiB
Plaintext
SET eq_range_index_dive_limit=default;
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SELECT @@eq_range_index_dive_limit;
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@@eq_range_index_dive_limit
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200
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CREATE TABLE t1
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(
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/* Field names reflect value(rowid) distribution, st=STairs, swt= SaWTooth */
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st_a int,
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swt1a int,
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swt2a int,
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st_b int,
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swt1b int,
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swt2b int,
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key sta_swt12a(st_a,swt1a,swt2a),
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key sta_swt1a(st_a,swt1a),
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key sta_swt2a(st_a,swt2a),
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key sta_swt21a(st_a,swt2a,swt1a),
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key st_a(st_a),
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key stb_swt1a_2b(st_b,swt1b,swt2a),
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key stb_swt1b(st_b,swt1b),
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key st_b(st_b)
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) ;
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ALTER TABLE t1 DISABLE KEYS;
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Warnings:
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Note 1031 Table storage engine for 't1' doesn't have this option
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#
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# Printing of many insert into t1 disabled.
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#
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ALTER TABLE t1 ENABLE KEYS;
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Warnings:
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Note 1031 Table storage engine for 't1' doesn't have this option
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ANALYZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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#
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# Run index_merge queries two times: 1) with index dives
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# 2) with index statistics
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#
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explain
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select * from t1
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1 limit 5;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a 15 const,const,const 1 5.00 Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b` from `test`.`t1` where ((`test`.`t1`.`swt2b` = 1) and (`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt2a` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1)) limit 5
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select * from t1
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1 limit 5;
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st_a swt1a swt2a st_b swt1b swt2b
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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explain
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select * from t1
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 limit 5;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a 15 const,const,const 1 5.00 Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b` from `test`.`t1` where ((`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt2a` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1)) limit 5
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select * from t1
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 limit 5;
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st_a swt1a swt2a st_b swt1b swt2b
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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explain
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select * from t1
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where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1 limit 5;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a 10 const,const 1 5.00 Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b` from `test`.`t1` where ((`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1)) limit 5
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select * from t1
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where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1 limit 5;
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st_a swt1a swt2a st_b swt1b swt2b
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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SET eq_range_index_dive_limit=1;
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SET SESSION DEBUG="+d,crash_records_in_range";
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explain
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select * from t1
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1 limit 5;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 15,15 NULL 1 10.00 Using intersect(sta_swt12a,stb_swt1a_2b); Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b` from `test`.`t1` where ((`test`.`t1`.`swt2b` = 1) and (`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt2a` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1)) limit 5
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select * from t1
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1 limit 5;
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st_a swt1a swt2a st_b swt1b swt2b
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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explain
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select * from t1
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 limit 5;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 15,15 NULL 1 100.00 Using intersect(sta_swt12a,stb_swt1a_2b); Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b` from `test`.`t1` where ((`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt2a` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1)) limit 5
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select * from t1
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 limit 5;
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st_a swt1a swt2a st_b swt1b swt2b
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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1 1 1 1 1 1
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explain
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select * from t1
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where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1 limit 5;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 10,10 NULL 1 100.00 Using intersect(sta_swt1a,stb_swt1b); Using where
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`st_a` AS `st_a`,`test`.`t1`.`swt1a` AS `swt1a`,`test`.`t1`.`swt2a` AS `swt2a`,`test`.`t1`.`st_b` AS `st_b`,`test`.`t1`.`swt1b` AS `swt1b`,`test`.`t1`.`swt2b` AS `swt2b` from `test`.`t1` where ((`test`.`t1`.`swt1b` = 1) and (`test`.`t1`.`st_b` = 1) and (`test`.`t1`.`swt1a` = 1) and (`test`.`t1`.`st_a` = 1)) limit 5
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select * from t1
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where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1 limit 5;
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st_a swt1a swt2a st_b swt1b swt2b
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1 1 3 1 1 3
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1 1 3 1 1 3
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1 1 3 1 1 3
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1 1 3 1 1 3
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1 1 3 1 1 3
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SET eq_range_index_dive_limit=1;
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SET SESSION DEBUG="+d,crash_records_in_range";
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DROP TABLE t1;
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