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Percona Software for MySQL Documentation

Percona Server for MySQL 8.0.27-18 (2022-03-02)

Percona Server for MySQL 8.0.27-18 includes all the features and bug fixes available in the MySQL 8.0.27 Community Edition. in addition to enterprise-grade features developed by Percona.

Percona Server for MySQL is a free, fully compatible, enhanced and open source drop-in replacement for any MySQL database. It provides superior performance, scalability, and instrumentation.

Percona Server for MySQL is trusted by thousands of enterprises to provide better performance and concurrency for their most demanding workloads, and delivers greater value to MySQL server users with optimized performance, greater performance scalability and availability, enhanced backups and increased visibility. Commercial support contracts are available.

Release highlights

The following lists a number of the bug fixes for MySQL 8.0.27, provided by Oracle, and included in Percona Server for MySQL:

  • The default_authentication_plugin is deprecated. Support for this plugin may be removed in future versions. Use the authentication_policy variable.

  • The binary operator is deprecated. Support for this operator may be removed in future versions. Use CAST(... AS BINARY).

  • Fix for when a parent table initiates a cascading SET NULL operation on the child table, the virtual column can be set to NULL instead of the value derived from the parent table.

Find the full list of bug fixes and changes in the MySQL 8.0.27 Release Notes.

New features

  • PS-7960: Documented the rocksdb_partial_index_sort_max_mem variable, the rocksdb_bulk_load_partial_index variable, and the rocksdb_cancel_manual_compactions variable.

  • PS-2346: LP #720547: Implemented an option to allow queries with specific error codes to add entries to the Slow Query Log.

Improvements

  • PS-7955: Enabled ZenFS functionality on standard Percona Server packages on Debian 11 and Ubuntu 20.04.

  • PS-7931: Implemented a Slow Query Log Rotation and Expiration in Percona Server for MySQL 8.0.

  • PS-6730: The ‘Last_errno:’ field in the Slow Query Log contains only error information.

  • PS-8076: Added a deprecation warning when using XtraDB changed page tracking.

Bugs fixed

  • PS-7883: An ALTER query caused a server exit when --rocksdb_write_disable_wal was enabled.

  • PS-8007: Percona Server for MySQL can fail to start if the server starts before the network mounts the datadir or a local mount of the datadir.

  • PS-7977: The AppArmor profile is broken after an 8.0.22-13 to 8.0.23-14 upgrade. (Thanks to Alex Kompel for reporting this issue)

  • PS-7958: A SELECT statement using a Full-Text Search index with a special character caused a server exit.

  • PS-7940: The initialization of a virtual column template if a child table had a virtual column caused a restart loop. This initialization prevented a server exit when there was an ON DELETE CASCADE statement in the parent table and the child table had virtual columns. (Upstream #105290)

  • PS-5654: On a view, the query digest for each SELECT statement is now based on the SELECT statement and not the view definition, which was the case for earlier versions (Upstream #89559)

  • PS-7975: Fix to allow test main.mtr_unit_tests to complete successfully (Thanks to Thomas Deutschmann for reporting this issue)

  • PS-7873: Fix for when the log_status table reported an incorrect executed_gtid (Thanks to zhujzhuo for reporting this issue) (Upstream #102175)

  • PS-5168 Fix for when the Slow Query Log reports tmp_table_size:0.

  • Normalized the zenfs utility backup and restore requirements for the --path command line option, the --backup_path command-lne option, and the restore_path command-line option. For more information, see Installing and configuring Percona Server for MySQL with ZenFS support.

Packaging notes

  • Red Hat Enterprise Linux 6 (and derivative Linux distributions) are no longer supported.

Known issues

The RPM packages for Red Hat Enterprise Linux 7 (and compatible derivatives) do not support TLSv1.3, as it requires OpenSSL 1.1.1, which is currently not available on this platform.

Contact us

The Documentation Contribution Guide describes the methods available to contribute to the Percona Server for MySQL documentation.

For free technical help, visit the Percona Community Forum.

To report bugs or submit feature requests, open a JIRA ticket.

For paid support and managed services or consulting services, contact Percona Sales.

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Last update: 2024-11-15