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85cc6b70bd
Introduced new alter algorithm type called NOCOPY & INSTANT for inplace alter operation. NOCOPY - Algorithm refuses any alter operation that would rebuild the clustered index. It is a subset of INPLACE algorithm. INSTANT - Algorithm allow any alter operation that would modify only meta data. It is a subset of NOCOPY algorithm. Introduce new variable called alter_algorithm. The values are DEFAULT(0), COPY(1), INPLACE(2), NOCOPY(3), INSTANT(4) Message to deprecate old_alter_table variable and make it alias for alter_algorithm variable. alter_algorithm variable for slave is always set to default.
51 lines
1.5 KiB
Plaintext
51 lines
1.5 KiB
Plaintext
CREATE TABLE t1(f1 INT NOT NULL,
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f2 INT NOT NULL,
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f3 INT AS (f2 * f2) VIRTUAL,
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INDEX idx (f2))engine=innodb;
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CREATE TABLE t2(f1 INT NOT NULL, f2 INT NOT NULL,
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f3 VARCHAR(10),
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INDEX(f1))ENGINE=INNODB;
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INSERT INTO t1(f1, f2) VALUES(1, 1);
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select @@alter_algorithm;
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@@alter_algorithm
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NOCOPY
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# Add column at the end of the table
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ALTER TABLE t1 ADD COLUMN f4 char(100) default "BIG WALL";
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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# Change virtual column expression
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ALTER TABLE t1 CHANGE f3 f3 INT AS (f2 * f2) VIRTUAL;
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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# Add virtual column
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ALTER TABLE t1 ADD COLUMN f5 INT AS (f2) VIRTUAL;
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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# Rename Column
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ALTER TABLE t1 CHANGE f3 vcol INT AS (f2) VIRTUAL;
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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# Rename table
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ALTER TABLE t1 RENAME t3;
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affected rows: 0
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# Drop Virtual Column
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ALTER TABLE t3 DROP COLUMN vcol;
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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# Column length varies
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ALTER TABLE t2 CHANGE f3 f3 VARCHAR(20);
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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SET foreign_key_checks = 0;
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affected rows: 0
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ALTER TABLE t3 ADD FOREIGN KEY `fidx`(f2) REFERENCES t2(f1);
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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SET foreign_key_checks = 1;
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affected rows: 0
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ALTER TABLE t3 DROP FOREIGN KEY `fidx`;
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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DROP TABLE t3, t2;
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affected rows: 0
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