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62 lines
2.6 KiB
Text
62 lines
2.6 KiB
Text
CREATE TABLE t1 (
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col_1 CHAR (255),
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col_2 VARCHAR (255)
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) ENGINE = InnoDB;
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CREATE INDEX idx1 ON t1(col_1);
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CREATE INDEX idx2 ON t1(col_2);
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SHOW INDEXES FROM 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 Ignored
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t1 1 idx1 1 col_1 A 0 NULL NULL YES BTREE NO
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t1 1 idx2 1 col_2 A 0 NULL NULL YES BTREE NO
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INSERT INTO t1 VALUES ("col1_00001", "col2_00001"), ("col1_00002", "col2_00002");
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SET STATEMENT use_stat_tables=never FOR
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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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SHOW INDEXES FROM 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 Ignored
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t1 1 idx1 1 col_1 A 2 NULL NULL YES BTREE NO
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t1 1 idx2 1 col_2 A 2 NULL NULL YES BTREE NO
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FLUSH TABLES t1 FOR EXPORT;
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backup: t1
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UNLOCK TABLES;
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DROP TABLE t1;
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CREATE TABLE t1 (
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col_1 CHAR (255),
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col_2 VARCHAR (255)
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) ENGINE = InnoDB STATS_PERSISTENT=1;
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CREATE INDEX idx1 ON t1(col_1);
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CREATE INDEX idx2 ON t1(col_2);
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SHOW INDEXES FROM 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 Ignored
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t1 1 idx1 1 col_1 A 0 NULL NULL YES BTREE NO
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t1 1 idx2 1 col_2 A 0 NULL NULL YES BTREE NO
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INSERT INTO t1 VALUES ("col1_00001", "col2_00001");
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SHOW INDEXES FROM 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 Ignored
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t1 1 idx1 1 col_1 A 1 NULL NULL YES BTREE NO
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t1 1 idx2 1 col_2 A 1 NULL NULL YES BTREE NO
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SET STATEMENT use_stat_tables=never FOR
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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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SHOW INDEXES FROM 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 Ignored
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t1 1 idx1 1 col_1 A 1 NULL NULL YES BTREE NO
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t1 1 idx2 1 col_2 A 1 NULL NULL YES BTREE NO
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ALTER TABLE t1 DISCARD TABLESPACE;
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restore: t1 .ibd and .cfg files
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ALTER TABLE t1 IMPORT TABLESPACE;
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SHOW INDEXES FROM 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 Ignored
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t1 1 idx1 1 col_1 A 2 NULL NULL YES BTREE NO
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t1 1 idx2 1 col_2 A 2 NULL NULL YES BTREE NO
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SET STATEMENT use_stat_tables=never FOR
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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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SHOW INDEXES FROM 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 Ignored
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t1 1 idx1 1 col_1 A 2 NULL NULL YES BTREE NO
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t1 1 idx2 1 col_2 A 2 NULL NULL YES BTREE NO
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DROP TABLE t1;
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