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Mysql: ALTER TABLE without locking the table?

原文 2020-08-31 12:18:23 2 1 mysql/ sql/ locking

I want to add column to an existing table.

Is there a manner to alter the table without locking it?

1 answers

No, that's not possible.

However, adding a nullable column or a not null column with a constant (immutable) default value is merely a catalog change and only takes a very short time (typically "milliseconds" if the lock can be obtained). But during that time, the exclusive lock can't be avoided.

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Mysql: ALTER TABLE without locking the table?

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1 answers

solution1 2 2020-08-31 12:24:45

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2 2020-08-31 12:24:45