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SET @old_innodb_file_per_table = @@innodb_file_per_table;
SET GLOBAL innodb_file_per_table = 1;
SELECT @@innodb_file_per_table;
@@innodb_file_per_table
1
CREATE TABLE t1 (
col_1 CHAR (255),
col_2 VARCHAR (255)
) ENGINE = InnoDB;
CREATE INDEX idx1 ON t1(col_1);
CREATE INDEX idx2 ON t1(col_2);
SHOW INDEXES FROM t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 idx1 1 col_1 A 0 NULL NULL YES BTREE
t1 1 idx2 1 col_2 A 0 NULL NULL YES BTREE
INSERT INTO t1 VALUES ("col1_00001", "col2_00001"), ("col1_00002", "col2_00002");
SHOW INDEXES FROM t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 idx1 1 col_1 A 2 NULL NULL YES BTREE
t1 1 idx2 1 col_2 A 2 NULL NULL YES BTREE
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
SHOW INDEXES FROM t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 idx1 1 col_1 A 2 NULL NULL YES BTREE
t1 1 idx2 1 col_2 A 2 NULL NULL YES BTREE
FLUSH TABLES t1 FOR EXPORT;
backup: t1
UNLOCK TABLES;
DROP TABLE t1;
CREATE TABLE t1 (
col_1 CHAR (255),
col_2 VARCHAR (255)
) ENGINE = InnoDB;
CREATE INDEX idx1 ON t1(col_1);
CREATE INDEX idx2 ON t1(col_2);
SHOW INDEXES FROM t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 idx1 1 col_1 A 0 NULL NULL YES BTREE
t1 1 idx2 1 col_2 A 0 NULL NULL YES BTREE
INSERT INTO t1 VALUES ("col1_00001", "col2_00001");
SHOW INDEXES FROM t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 idx1 1 col_1 A 1 NULL NULL YES BTREE
t1 1 idx2 1 col_2 A 1 NULL NULL YES BTREE
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
SHOW INDEXES FROM t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 idx1 1 col_1 A 1 NULL NULL YES BTREE
t1 1 idx2 1 col_2 A 1 NULL NULL YES BTREE
ALTER TABLE t1 DISCARD TABLESPACE;
restore: t1 .ibd and .cfg files
ALTER TABLE t1 IMPORT TABLESPACE;
SHOW INDEXES FROM t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 idx1 1 col_1 A 2 NULL NULL YES BTREE
t1 1 idx2 1 col_2 A 2 NULL NULL YES BTREE
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
SHOW INDEXES FROM t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 idx1 1 col_1 A 2 NULL NULL YES BTREE
t1 1 idx2 1 col_2 A 2 NULL NULL YES BTREE
DROP TABLE t1;
SET GLOBAL innodb_file_per_table = @old_innodb_file_per_table;