What is MariaDB 10.2?

You are viewing an old version of this article. View the current version here.

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. It will be supported until May 2022.

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. XtraDB in 10.2 is not up to date with the latest features of InnoDB and cannot be used. The main reason for this change is that most of the important features of XtraDB are nowadays implemented in InnoDB . As the MariaDB team is doing a lot more InnoDB development than ever before, we can't anymore manage updating two almost identical engines. The InnoDB version in MariaDB contains the best features of MySQL InnoDB and XtraDB and a lot more. As the InnoDB on disk format is identical to XtraDB's this will not cause any problems when upgrading to MariaDB 10.2.

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. Variable changes 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

Comments

Comments loading...
Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.