The Ultimate Guide to High Availability with MariaDB

Storage-engine independent column compression

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MariaDB starting with 10.3.2

Storage-engine independent support for column compression was introduced in MariaDB 10.3.2

Storage-engine independent column compression enables TINYBLOB, BLOB, MEDIUMBLOB, LONGBLOB, TINYTEXT, TEXT, MEDIUMTEXT, LONGTEXT, VARCHAR and VARBINARY columns to be compressed.

This is performed by means of a new COMPRESSED column attribute: COMPRESSED[=<compression_method>]

New System Variables

  • column_compression_threshold
  • column_compression_zlib_level
  • column_compression_zlib_strategy
  • column_compression_zlib_wrap

New Status Variables

  • Column_compressions
  • Column_decompressions

Limitations

  • The only supported method currently is zlib,
  • The CSV storage engine stores data uncompressed on-disk even if the COMPRESSED attribute is present
  • It is not possible to create indexes over compressed columns.

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