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45 lines
2.2 KiB
Text
45 lines
2.2 KiB
Text
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (a <INT_COLUMN>, <CUSTOM_INDEX>(a)) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
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INSERT INTO t1 (a) VALUES (10);
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INSERT INTO t1 (a) VALUES
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(1),(2),(3),(4),(5),(6),(7),(8),(9),
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(21),(22),(23),(24),(25),(26),(27),(28),(29);
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EXPLAIN SELECT a FROM t1 ORDER BY a;
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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 5 NULL # Using index
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SHOW INDEX IN t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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t1 1 a 1 a # # NULL NULL YES BTREE
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ALTER TABLE t1 DISABLE KEYS;
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SHOW INDEX IN t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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t1 1 a 1 a # # NULL NULL YES BTREE disabled
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EXPLAIN SELECT a FROM t1 ORDER BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 19 Using filesort
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INSERT INTO t1 (a) VALUES
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(11),(12),(13),(14),(15),(16),(17),(18),(19),(20);
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ALTER TABLE t1 ENABLE KEYS;
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SHOW INDEX IN t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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t1 1 a 1 a # # NULL NULL YES BTREE
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EXPLAIN SELECT a FROM t1 ORDER BY a;
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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 5 NULL # Using index
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DROP TABLE t1;
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CREATE TABLE t1 (a <INT_COLUMN>, UNIQUE INDEX(a)) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
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INSERT INTO t1 (a) VALUES
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(1),(2),(3),(4),(5),(6),(7),(8),(9),
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(21),(22),(23),(24),(25),(26),(27),(28),(29);
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ALTER TABLE t1 DISABLE KEYS;
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INSERT INTO t1 (a) VALUES (29);
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ERROR 23000: Duplicate entry '29' for key 'a'
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# Statement ended with one of expected results (ER_DUP_ENTRY,ER_DUP_KEY).
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# If you got a difference in error message, just add it to rdiff file
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SHOW INDEX IN t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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t1 0 a 1 a # # NULL NULL YES BTREE
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EXPLAIN SELECT a FROM t1 ORDER BY a;
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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 5 NULL # Using index
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DROP TABLE t1;
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