14.16.1 InnoDB INFORMATION_SCHEMA Tables about Compression

There are two pairs of InnoDB INFORMATION_SCHEMA tables about compression that can provide insight into how well compression is working overall:

INNODB_CMP and INNODB_CMP_RESET provide information about the number of compression operations and the amount of time spent performing compression.
INNODB_CMPMEM and INNODB_CMPMEM_RESET provide information about the way memory is allocated for compression.