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MySQL 5.5 Reference Manual
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14.18.1.1 INNODB_CMP and INNODB_CMP_RESET

The INNODB_CMP and INNODB_CMP_RESET tables contain status information about operations related to compressed tables, which are described in Section 14.12, “InnoDB Table Compression”. The PAGE_SIZE column reports the compressed page size.

These two tables have identical contents, but reading from INNODB_CMP_RESET resets the statistics on compression and uncompression operations. For example, if you archive the output of INNODB_CMP_RESET every 60 minutes, you see the statistics for each hourly period. If you monitor the output of INNODB_CMP (making sure never to read INNODB_CMP_RESET), you see the cumulated statistics since InnoDB was started.

For the table definition, see Section 21.28.4, “The INFORMATION_SCHEMA INNODB_CMP and INNODB_CMP_RESET Tables”.


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