重命名锁定的表 [英] renaming a locked table

问题描述

将表迁移到新架构时，我想确保使用复制和重命名过程将原子切换到新表.因此，我试图像这样重命名锁定的表:

When migrating a table to a new schema I want to make sure to have an atomic switch to the new table using the copy and rename procedure. Hence I am trying to rename a locked table like this:

CREATE TABLE foo_new (...)

-- copy data to new table, might take very long
INSERT INTO foo_new (id,created_at,modified_at)
  SELECT * FROM foo WHERE id <= 3;

LOCK TABLES foo WRITE, foo_new WRITE;

-- quickly copy the tiny rest over
INSERT INTO foo_new (id,created_at,modified_at)
  SELECT * FROM foo WHERE id > 3;

-- now switch to the new table
RENAME TABLE foo TO foo_old, foo_new TO foo;

UNLOCK TABLES;

不幸的是，结果为ERROR 1192 (HY000): Can't execute the given command because you have active locked tables or an active transaction.

这应该怎么做?

这是与mariadb:10.1一起使用的.

推荐答案

一般而言，Rick有权使用Percona工具(请参阅似乎不是这种情况.

While in general Rick is right to use the Percona Tools (see 1 and 2), the answer to the question really is to use ALTER TABLE. I thought RENAME was just an alias - but it seems like that's not the case.

测试似乎表明它可以正常工作:

Test seem to indicate that this works OK:

CREATE TABLE foo_new (...)

-- copy data to new table, might take very long
INSERT INTO foo_new (id,created_at,modified_at)
  SELECT * FROM foo WHERE id <= 3;

LOCK TABLES foo WRITE, foo_new WRITE;

-- quickly copy the tiny rest over
INSERT INTO foo_new (id,created_at,modified_at)
  SELECT * FROM foo WHERE id > 3;

-- now switch to the new table
ALTER TABLE foo RENAME TO foo_old;
ALTER TABLE foo_new RENAME TO foo;

UNLOCK TABLES;

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