Information Schema QUERY_CACHE_INFO Table

MariaDB starting with 5.5.31

The QUERY_CACHE_INFO table was introduced as part of the QUERY_CACHE_INFO plugin in MariaDB 5.5.31.


The table is not a standard Information Schema table, and is a MariaDB extension.

The QUERY_CACHE_INFO table is created by the QUERY_CACHE_INFO plugin, and allows you to see the contents of the query cache. It creates a table in the information_schema database that shows all queries that are in the cache. You must have the PROCESS privilege (see GRANT) to use this table.

It contains the following columns:

STATEMENT_SCHEMADatabase used when query was included
RESULT_BLOCKS_COUNTNumber of result blocks
RESULT_BLOCKS_SIZESize in bytes of result blocks
RESULT_BLOCKS_SIZE_USEDSize in bytes of used blocks

For example:

SELECT * FROM information_schema.QUERY_CACHE_INFO;
| test             | SELECT * FROM a |                   1 |                512 |                     143 |
| test             | select * FROM a |                   1 |                512 |                     143 |

The QUERY_CACHE_INFO table will be removed in a future release, and replaced by the QUERY_CACHE_QUERIES table (see MDEV-4682).


Comments loading...
Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.