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Percona Software for MySQL Documentation

Percona Server for MySQL 8.0.28-19 (2022-05-12)

Percona Server for MySQL 8.0.28-19 includes all the features and bug fixes available in the MySQL 8.0.28 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. It delivers more 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

Improvements and bug fixes introduced by Oracle for MySQL 8.0.28 and included in Percona Server for MySQL are the following:

  • The ASCII shortcut for CHARACTER SET latin1 and UNICODE shortcut for CHARACTER SET ucs2 are deprecated and raise a warning to use CHARACTER SET instead. The shortcuts will be removed in a future version.

  • A stored function and a loadable function with the same name can share the same namespace. Add the schema name when invoking a stored function in the shared namespace. The server generates a warning when function names collide.

  • InnoDB supports ALTER TABLE ... RENAME COLUMN operations when using ALGORITHM=INSTANT.

  • The limit for innodb_open_files now includes temporary tablespace files. The temporary tablespace files were not counted in the innodb_open_files in previous versions.

Find the full list of bug fixes and changes in the MySQL 8.0.28 Release Notes.

Deprecation and removal

Starting with Percona Server for MySQL 8.0.28-19, the TokuDB storage engine is no longer supported. We have removed the storage engine from the installation packages and the storage engine is disabled in our binary builds.

Improvement

  • PS-7871: Using the SET_VAR syntax, MyRocks variables can be set dynamically.

  • PS-8064: The ability to change log file locations dynamically is restricted.

Bugs fixed

  • PS-7999: The FEDERATED storage engine would not reconnect when a wait_timeout was exceeded. (Thanks to Sami Ahlroos for reporting this issue) (Upstream #105878)

  • PS-7856: Fixed for a sever exit caused by an update query on a partition tables.

  • PS-8032: An Inplace index build with lock=exclusive did not generate an MLOG_ADD_INDEX redo.

  • PS-8050: An upgrade from Percona Server for MySQL 5.7 to MySQL 8.0.26, caused a server exit with an assertion failure.

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Last update: 2024-11-15