What is MariaDB 10.2?

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The most recent release of MariaDB 10.2 is:
MariaDB 10.2.44 Stable (GA) Download Now

MariaDB 10.2 is the current major stable version.

The following lists the major new features in MariaDB 10.2:

Implemented Features

InnoDB as default

  • InnoDB is now the default storage engine. Until MariaDB 10.1, MariaDB used the XtraDB storage engine as default

Syntax / general features

Triggers

Replication / binary log

GeoJSON / JSON

Information Schema

EXPLAIN

  • EXPLAIN FORMAT=JSON now shows outer_ref_condition field which contains the condition that the(?) SELECT checks on each re-execution (MDEV-9652)
  • EXPLAN FORMAT=JSON now shows sort_key field which shows the sort criteria used by filesort operation. (commit 2078392)
  • EXPLAIN used to show incorrect information about how the optimizer resolved ORDER BY clause or Distinct. This was a long-standing problem with roots back in MySQL. Now, after MDEV-8646 and related fixes, the problem doesn't exist anymore. (For test cases, see MDEV-7982, MDEV-8857, MDEV-7885, MDEV-326)

Optimizations

  • Connection setup was made faster by moving creation of THD to new thread (MDEV-6150)
  • Pushdown conditions into non-mergeable views/derived tables (MDEV-9197) — Original code from Galina Shalygina
  • ANALYZE TABLE has been re-implemented so as not to lock the entire table when collecting engine independent statistics (MDEV-7901)
  • Internal CRC32 routines use the optimized implementation on Power8 — MDEV-9872
  • Table cache can automatically partition itself as needed to reduce the contention (MDEV-10296)

Compatibility

  • NO PAD collations, which means that end space are significant in comparisons (MDEV-9711) — Original code from Daniil Medvedev
  • MariaDB now works when started with a MySQL 5.7.6+ data directory (MDEV-11170)

CONNECT

System variables

For a list of all new variables, see System Variables Added in MariaDB 10.2 and Status Variables Added in MariaDB 10.2. These include:

New status variables

Scripts

Other changes

  • Added support for OpenSSL 1.1 and LibreSSL (MDEV-10332)
  • Persistent AUTO_INCREMENT for InnoDB (MDEV-6076)
  • Support COM_RESET_CONNECTION (MDEV-10340)
  • "fast mutexes" have been removed. These aren't faster than normal mutexes, and have been disabled by default for years (MDEV-8111)
  • Old GPL client library is gone; now MariaDB Server comes with the LGPL Connector/C client library (MDEV-9055)

List of all MariaDB 10.2 releases

See also

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