MySQL 5.7 Release Notes
This section provides information about the
InnoDB table compression and
InnoDB page compression features. The page
compression feature is referred to as
transparent page
compression.
Using the compression features of InnoDB, you can
create tables where the data is stored in compressed form.
Compression can help to improve both raw performance and
scalability. The compression means less data is transferred between
disk and memory, and takes up less space on disk and in memory. The
benefits are amplified for tables with
secondary indexes,
because index data is compressed also. Compression can be especially
important for SSD storage devices,
because they tend to have lower capacity than
HDD devices.