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Percona Server for MySQL 8.4.0-1 (2024-08-28)

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Percona Server for MySQL 8.4.0-1 includes all the features and bug fixes available in the MySQL 8.4 Community Edition in addition to enterprise-grade features developed by Percona.

Release highlights

In MySQL 8.0, the release model changed to include new features in patch releases, allowing MySQL to introduce new features more frequently. However, this approach was complex for projects and applications needing only critical patches with minimal changes.

MySQL then moved to a versioning model with two options: Innovation releases and Long-Term Support (LTS) releases. Both types are production-ready.

Innovation releases offer access to the latest features, making them ideal for dynamic environments with strong automated testing and continuous integration.

Changes were made to each Innovation release that are now included in the 8.4 (LTS) release. You should review the Innovation release notes for details.

LTS releases are more suitable for stable, established environments where minimal changes are needed. These releases include only essential fixes, reducing the risk of changes in the database software’s behavior.

This 8.4.0-1 release is the first 8.4 LTS series.

Improvements and bug fixes introduced by Oracle for MySQL 8.4 and included in Percona Server for MySQL are the following:

  • The MySQL native password has been deprecated and is no longer loaded by default. However, it can be loaded if needed.

  • The clone plugin allows cloning between different point releases within the same series. You only must match the major and minor version numbers for cloning.

  • GTIDs (Global Transaction Identifiers) can now handle groups of transactions, which helps speed up processing.

  • mysqldump can now create output for older versions of MySQL.

  • Automatic updates for histograms. When enabled, the histogram updates automatically whenever ANALYZE TABLE is run on the table. InnoDB’s automatic recalculation of persistent statistics also updates the histogram when automatic updates are enabled.

  • Adds a new privilege called FLUSH_PRIVILEGES. This privilege explicitly allows the use of FLUSH PRIVILEGES statements. Unlike the RELOAD privilege, FLUSH_PRIVILEGES only applies to FLUSH PRIVILEGES statements.

  • The terms “MASTER” and “SLAVE” in replication commands are being replaced with “SOURCE” and “REPLICA”. This change is part of an ongoing effort to use more inclusive language.

  • Removed the the mysqlpump utility.

  • Removed the mysql_upgrade utility.

  • The default values for specific InnoDB server system variables have changed. See What is new in MySQL 8.4 since 8.0 for details.

Find the complete list of bug fixes and changes in the MySQL 8.4 Release Notes.’

New features

  • PS-9233: Adds the UUID_VX component which provides a set of functions for generating and working with various versions of the Universally Unique Identifier (UUID).

Improvements

  • PS-9302: Changed underlying internal data structure used by the binlog transaction dependency tracking in WRITESET mode (MySQL 8.4 removed the COMMIT_ORDER mode). Instead of std::map (an RB-tree) we now use std::unordered_map (a hash) which gives much better performance for lookup operations. This change showed an up to 17% Queries per second (QPS) increase in the oltp_inlist_update workload.

Bug fixes

  • PS-9092: There were data inconsistencies during a high rate of page split/merge.

  • PS-9121: MySQL exited when InnoDB failed to update a spatial index.

  • PS-9151: Percona server 8.0 build failed on CentOS 7 with -DWITH_SSL=openssl11.

  • PS-9219: While converting the charset collation in a table, MySQL converted the date and time data types columns in the .ibd file. However, the collation_id in the .ibd file did not align with that of the data dictionary.

  • PS-9155: The server exited during the execution of the complicated query with 9 CTEs.

  • PS-9235: Keyring vault failed to work with binlog_rotate_encryption_master_key_at_startup.

Deprecation

  • PS-8963: The SEQUENCE_TABLE() function is deprecated and may be removed in a future release. We recommend that you use PERCONA_SEQUENCE_TABLE() instead. To maintain compatibility with existing third-party software, SEQUENCE_TABLE is no longer a reserved term and can be used as a regular identifier. Find more information in PERCONA_SEQUENCE_TABLE(n) function

Packaging notes

Percona Server for MySQL 8.4.0-1 is compatible with Ubuntu 24.04.

Additional resources

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Last update: 2024-07-24