How to Clear MySQL Query Cache Without Restarting the Server?

How to Clear MySQL Query Cache Without Server Restart

To enhance MySQL performance, it is essential to clear the query cache periodically. While server restart is typically used to clear the cache, there are more efficient methods.

One approach to purge the query cache without restarting the server is to execute the following command:

RESET QUERY CACHE;

This command effectively erases all cached queries, making way for new ones. However, it is important to note that the user executing this command must have reload rights.

An alternative to resetting the cache is to defragment it using the following command:

FLUSH QUERY CACHE;

Defragmentation reorganizes the query cache, improving its efficiency without removing any queries.

For more comprehensive information on managing the MySQL query cache, refer to the "Query Cache Status and Maintenance" section in the MySQL manual.

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