ALTER Optimization

August 14, 2012

One of my colleague asked me : « Is an ALTER TABLE with many specifications is faster than 1 ALTER TABLE by specification ? »

The answers seems quite intuitive, anyway figures are better than a long speech…

Context :

MySQL Community Server 5.5.22

InnoDB table with 8 539 238 rows.

17 columns with INT, CHAR, VARCHAR, TEXT, DATETIME, … fields

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