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b716231238
fil_space_extend_must_retry(): If the table is being truncated, do not call fil_flush_low(). The operation is covered by the truncate log. File extension during TRUNCATE only occurs if there are many indexes on the table. With smaller innodb_page_size, the file extension occurs already with fewer indexes on the table.
81 lines
2.9 KiB
Plaintext
81 lines
2.9 KiB
Plaintext
#
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# TRUNCATE TABLE
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#
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# Truncating is disallowed for parent tables unless such table
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# participates in self-referencing foreign keys only.
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#
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CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
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CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `test`.`t1` (`pk`))
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# Truncation of child should succeed.
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TRUNCATE TABLE t2;
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DROP TABLE t2;
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DROP TABLE t1;
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CREATE TABLE t1 (pk INT PRIMARY KEY, fk INT,
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FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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# Truncation of self-referencing table should succeed.
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TRUNCATE TABLE t1;
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DROP TABLE t1;
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#
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# Also, truncating such tables is allowed if foreign key
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# checks are disabled.
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#
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SET @old_foreign_key_checks = @@SESSION.foreign_key_checks;
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CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
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CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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CREATE TABLE t3 (pk INT PRIMARY KEY, fk INT,
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FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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SET @@SESSION.foreign_key_checks = 0;
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TRUNCATE TABLE t1;
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TRUNCATE TABLE t2;
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TRUNCATE TABLE t3;
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SET @@SESSION.foreign_key_checks = 1;
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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `test`.`t1` (`pk`))
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TRUNCATE TABLE t2;
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TRUNCATE TABLE t3;
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LOCK TABLES t1 WRITE;
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SET @@SESSION.foreign_key_checks = 0;
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TRUNCATE TABLE t1;
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SET @@SESSION.foreign_key_checks = 1;
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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `test`.`t1` (`pk`))
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UNLOCK TABLES;
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DROP TABLE t3,t2,t1;
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SET @@SESSION.foreign_key_checks = @old_foreign_key_checks;
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#
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# Test that TRUNCATE resets auto-increment.
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#
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CREATE TABLE t1 (a INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
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b INT, c INT, d INT, e INT, f INT, g INT, h INT, i INT, j INT, k INT,
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l INT, m INT, n INT, o INT, p INT, q INT, r INT, s INT, t INT, u INT,
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KEY(b),KEY(c),KEY(d),KEY(e),KEY(f),KEY(g),KEY(h),KEY(i),KEY(j),KEY(k),
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KEY(l),KEY(m),KEY(n),KEY(o),KEY(p),KEY(q),KEY(r),KEY(s),KEY(t),KEY(u),
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KEY(c,b),KEY(d,b),KEY(e,b),KEY(f,b),KEY(g,b),KEY(h,b),KEY(i,b),KEY(j,b),
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KEY(k,b),KEY(l,b),KEY(m,b),KEY(n,b),KEY(o,b),KEY(p,b),KEY(q,b),KEY(r,b),
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KEY(s,b),KEY(t,b),KEY(u,b),
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KEY(d,c),KEY(e,c),KEY(f,c),KEY(g,c),KEY(h,c),KEY(i,c),KEY(j,c),
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KEY(k,c),KEY(l,c),KEY(m,c),KEY(n,c),KEY(o,c),KEY(p,c),KEY(q,c),KEY(r,c),
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KEY(s,c),KEY(t,c),KEY(u,c),
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KEY(e,d),KEY(f,d),KEY(g,d),KEY(h,d),KEY(i,d),KEY(j,d)
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) ENGINE=InnoDB;
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INSERT INTO t1 () VALUES (), ();
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SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
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AUTO_INCREMENT
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3
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SELECT a FROM t1 ORDER BY a;
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a
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1
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2
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TRUNCATE TABLE t1;
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SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
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AUTO_INCREMENT
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1
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INSERT INTO t1 () VALUES (), ();
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SELECT a FROM t1 ORDER BY a;
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a
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1
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2
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DROP TABLE t1;
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