How to Clear the MySQL Query Cache Without Restarting the Server?

Clear MySQL Query Cache Without Restarting Server

In this article, we'll explore alternative methods to clear the MySQL query cache without resorting to a server restart.

Query Cache

The MySQL query cache stores the results of previously executed queries, improving the response time for subsequent executions of the same query. However, this cache can accumulate unnecessary data over time, affecting performance.

Clearing the Query Cache

1. RESET QUERY CACHE:

If the user has reload rights, you can directly clear the query cache using the following command:

RESET QUERY CACHE;

2. FLUSH QUERY CACHE:

Alternatively, you can defragment the query cache, which also clears any unnecessary data, using:

FLUSH QUERY CACHE;

Additional Information

For further details on query cache status and maintenance, refer to the Query Cache Status and Maintenance section of the MySQL manual.

By implementing these techniques, you can effectively manage the MySQL query cache without requiring a server restart, optimizing performance and maintaining data integrity.

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