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SET eq_range_index_dive_limit=default; SELECT @@eq_range_index_dive_limit; @@eq_range_index_dive_limit 200 CREATE TABLE t1 ( /* Field names reflect value(rowid) distribution, st=STairs, swt= SaWTooth */ st_a int, swt1a int, swt2a int, st_b int, swt1b int, swt2b int, key sta_swt12a(st_a,swt1a,swt2a), key sta_swt1a(st_a,swt1a), key sta_swt2a(st_a,swt2a), key sta_swt21a(st_a,swt2a,swt1a), key st_a(st_a), key stb_swt1a_2b(st_b,swt1b,swt2a), key stb_swt1b(st_b,swt1b), key st_b(st_b) ) ; ALTER TABLE t1 DISABLE KEYS; # # Printing of many insert into t1 disabled. # ALTER TABLE t1 ENABLE KEYS; ANALYZE TABLE t1; Table Op Msg_type Msg_text test.t1 analyze status Table is already up to date # # Run index_merge queries two times: 1) with index dives # 2) with index statistics # explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1 limit 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 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 3 10.00 Using intersect(sta_swt12a,stb_swt1a_2b); Using where Warnings: 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 select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1 limit 5; st_a swt1a swt2a st_b swt1b swt2b 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 limit 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 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 3 100.00 Using intersect(sta_swt12a,stb_swt1a_2b); Using where Warnings: 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 select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 limit 5; st_a swt1a swt2a st_b swt1b swt2b 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 explain select * from t1 where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1 limit 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 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 89 10.99 Using where Warnings: 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 select * from t1 where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1 limit 5; st_a swt1a swt2a st_b swt1b swt2b 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 SET eq_range_index_dive_limit=1; SET SESSION DEBUG="+d,crash_records_in_range"; explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1 limit 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 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 3 10.00 Using intersect(sta_swt12a,stb_swt1a_2b); Using where Warnings: 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 select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1 limit 5; st_a swt1a swt2a st_b swt1b swt2b 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 limit 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 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 3 100.00 Using intersect(sta_swt12a,stb_swt1a_2b); Using where Warnings: 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 select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 limit 5; st_a swt1a swt2a st_b swt1b swt2b 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 explain select * from t1 where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1 limit 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 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 90 11.11 Using where Warnings: 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 select * from t1 where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1 limit 5; st_a swt1a swt2a st_b swt1b swt2b 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 SET eq_range_index_dive_limit=1; SET SESSION DEBUG="+d,crash_records_in_range"; DROP TABLE t1;