2010-09-07 16:06:33 +00:00
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SET STORAGE_ENGINE = 'tokudb';
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DROP TABLE IF EXISTS foo;
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create table foo ( a int, b int, c int);
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insert into foo values (1,1,1),(1,2,2),(1,3,3),(2,1,1),(2,2,2),(2,3,3),(3,1,1),(3,2,2),(3,3,3);
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insert into foo values (4,4,1),(4,5,2),(4,6,3),(5,4,1),(5,5,2),(5,6,3),(6,4,1),(6,5,2),(6,6,3);
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insert into foo select * from foo;
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insert into foo select * from foo;
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insert into foo select * from foo;
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insert into foo select * from foo;
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insert into foo select * from foo;
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insert into foo select * from foo;
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insert into foo select * from foo;
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insert into foo select * from foo;
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insert into foo select * from foo;
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insert into foo select * from foo;
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insert into foo select * from foo;
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select count(*) from foo;
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count(*)
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36864
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alter table foo add index (a), add index (b);
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explain select * from foo where a=2 and b=2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE foo index_merge a,b a,b 5,5 NULL 1024 Using intersect(a,b); Using where
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alter table foo drop index a;
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alter table foo add clustering index (a);
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explain select * from foo where a=2 and b=2;
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id select_type table type possible_keys key key_len ref rows Extra
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2010-11-12 16:29:14 +00:00
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1 SIMPLE foo ref b,a a 5 const 6144 Using where
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2010-09-07 16:06:33 +00:00
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alter table foo drop index a;
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alter table foo drop index b;
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alter table foo add index (a);
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alter table foo add clustering index(b);
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explain select * from foo where a=2 and b=2;
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id select_type table type possible_keys key key_len ref rows Extra
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2010-11-12 16:29:14 +00:00
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1 SIMPLE foo ref a,b b 5 const 6144 Using where
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2010-09-07 16:06:33 +00:00
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alter table foo drop index a;
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alter table foo drop index b;
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alter table foo add clustering index (a), add clustering index (b);
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explain select * from foo where a=2 and b=2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE foo ref a,b a 5 const 6144 Using where
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DROP TABLE foo;
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