MariaDB 10.2.40 Release Notes

Download Release Notes Changelog Overview of 10.2

Alternate download from mariadb.org

Release date: 6 Aug 2021

MariaDB 10.2 is a previous stable series of MariaDB. It is an evolution of MariaDB 10.1 with several entirely new features not found anywhere else and with backported and reimplemented features from MySQL 5.6 and 5.7.

MariaDB 10.2.40 is a Stable (GA) release.

For an overview of MariaDB 10.2 see the What is MariaDB 10.2? page.

Thanks, and enjoy MariaDB!

Notable Items

InnoDB

  • InnoDB no longer acquires advisory file locks by default (MDEV-24393)
  • Encryption: Automatically disable key rotation checks for file_key_management plugin (MDEV-14180)
  • Some fixes from MySQL 5.7.35 (MDEV-26205)

Optimizer

  • A query that uses ORDER BY .. LIMIT clause and "Range checked for each record optimization" could produce incorrect results under some circumstances (MDEV-25858)
  • Queries that have more than 32 equality conditions comparing columns of different tables ("tableX.colX=tableY.colY) could cause a stack overrun in the query optimizer (MDEV-17783, MDEV-23937)
  • "Condition pushdown into derived table" optimization cannot be applied if the expression being pushed refers to a derived table column which is computed from expression that has a stored function call, @session variable reference, or other similar construct. The fix for MDEV-25969 makes it so that only the problematic part of the condition is not pushed. The rest of the condition is now pushed. (MDEV-25969)
  • A query with window function on the left side of the subquery could cause a crash. (MDEV-25630)
  • Wrong result selecting from simple view with LIMIT and ORDER BY Queries with views/derived table/CTEs that have this form: "(SELECT ... LIMIT <n>) ORDER BY ...>" could produce wrong results (MDEV-25679)

Packaging & Misc

Security

Upgrading from 10.2 versions earlier than 10.2.17 is highly recommended
for all Galera users due to bug MDEV-12837 which caused serious stability
issues with earlier versions. See the bug issue page for more information.

When upgrading from MariaDB 10.2.16 or earlier to MariaDB 10.2.17 or higher,
running mysql_upgrade is required due to changes introduced in MDEV-14637.

Changelog

For a complete list of changes made in MariaDB 10.2.40 with links to detailed information on each push, see the changelog.


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