tables contain status information about compressed pages that
reside in the buffer pool. Please consult
Section 14.10, “InnoDB Compressed Tables” for further information on
compressed tables and the use of the buffer pool. The
tables should provide more useful statistics on compression.
tables have identical contents, but reading from
resets the statistics on relocation operations. For example, if
every 60 minutes you archived the output of
it would show the hourly statistics. If you never read
and monitored the output of
INNODB_CMPMEM instead, it would
show the cumulated statistics since
For the table definition, see Section 21.28.2, “The INFORMATION_SCHEMA INNODB_CMPMEM and INNODB_CMPMEM_RESET Tables”.