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All versions of MySQL (not Microsoft SQL Server). Please also add a version-specific tag like mysql-5.7 if that is relevant to the question.

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A few days ago mysql became suddenly very slow with queries taking more than 10s to complete when they used to complete under 100ms... It lasted about an hour and then the speed was normal again … . What could cause such a problem? A few more information: The mysql version is 5.0.51a The mysql database is on a dedicated box with 1.5 GB ram. There was no swap being used when the mysql server was …
asked Oct 23 '11 by Thomas Wang