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53 lines
1.1 KiB
Plaintext
53 lines
1.1 KiB
Plaintext
SET DEFAULT_STORAGE_ENGINE = 'tokudb';
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DROP TABLE IF EXISTS foo;
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set session unique_checks=off;
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create table foo (a int, b int, c int, primary key (a), key(b));
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insert into foo values (1,10,100),(2,20,200),(3,30,300),(4,40,400),(5,50,500),(6,60,600);
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explain select * from foo;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE foo ALL NULL NULL NULL NULL 6
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select * from foo;
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a b c
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1 10 100
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2 20 200
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3 30 300
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4 40 400
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5 50 500
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6 60 600
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explain select b from foo;
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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 NULL b 5 NULL 6 Using index
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select b from foo;
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b
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10
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20
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30
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40
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50
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60
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replace into foo values (1,1,1);
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explain select * from foo;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE foo ALL NULL NULL NULL NULL 6
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select * from foo;
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a b c
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1 1 1
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2 20 200
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3 30 300
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4 40 400
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5 50 500
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6 60 600
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explain select b from foo;
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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 NULL b 5 NULL 6 Using index
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select b from foo;
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b
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1
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20
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30
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40
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50
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60
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set session unique_checks=on;
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DROP TABLE foo;
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