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Percona Software for MySQL Documentation

Percona Distribution for MySQL 8.0.31 using Percona XtraDB Cluster (2023-03-15)

Release date March 15, 2023
Install instructions Installing Percona Distribution for MySQL

Percona Distribution for MySQL is the most stable, scalable and secure open-source MySQL distribution, with two download options: one based on Percona Server for MySQL and one based on Percona XtraDB Cluster.

This release is focused on the Percona XtraDB Cluster-based deployment variation. It is based on Percona XtraDB Cluster 8.0.31-23

Release highlights

This release adds the GCache encryption and Write-Set cache encryption feature in tech preview.

Improvements and bug fixes introduced by Oracle for MySQL 8.0.31 and included in Percona XtraDB Cluster and Percona Distribution for MySQL are the following:

  • MySQL adds support for the SQL standard INTERSECT and EXCEPT table operators.

  • InnoDB supports parallel index builds. This improves index build performance. The sorted index entries are loaded into a B-tree in a multithread. In previous releases, this action was performed by a single thread.

  • The Performance and sys schemas show metrics for the global and session memory limits introduced in MySQL 8.0.28.

    The following columns have been added to the Performance Schema tables:

    Performance Schema tables Columns
    SETUP_INSTRUMENTS FLAGS
    THREADS CONTROLLED_MEMORY, MAX_CONTROLLED_MEMORY, TOTAL_MEMORY, MAX_TOTAL_MEMORY
    EVENTS_STATEMENTS_CURRENT, EVENTS_STATEMENTS_HISTORY, EVENTS_STATEMENTS_HISTORY_LONG MAX_CONTROLLED_MEMORY, MAX_TOTAL_MEMORY
    Statement Summary Tables MAX_CONTROLLED_MEMORY, MAX_TOTAL_MEMORY
    Performance Schema Connection Tables MAX_SESSION_CONTROLLED_MEMORY, MAX_SESSION_TOTAL_MEMORY
    PREPARED_STATEMENTS_INSTANCES MAX_CONTROLLED_MEMORY, MAX_TOTAL_MEMORY

    The following columns have been added to the sys schema STATEMENT_ANALYSIS and X$STATEMENT_ANALYSIS views:

    • MAX_CONTROLLED_MEMORY

    • MAX_TOTAL_MEMORY

    The controlled_by_default flag has been added to the PROPERTIES column of the SETUP_INSTRUMENTS table.

    Now, you can add and remove non-global memory instruments to the set of controlled-memory instruments. To do this, set the value of the FLAGS column of SETUP_INSTRUMENTS.

    SQL> UPDATE PERFORMANCE_SCHEMA.SETUP_INTRUMENTS SET FLAGS="controlled" 
WHERE NAME='memory/sql/NET::buff';

  • The audit_log_flush variable has been deprecated and will be removed in future releases.

Find the full list of bug fixes and changes in the MySQL 8.0.31 Release Notes.

Supplied components

Review each component’s release notes for What’s new, improvements, or bug fixes. The following is a list of the components supplied with the Percona Server for MySQL-based variation of the Percona Distribution for MySQL:

Component Version Description
Percona XtraBackup 8.0.31-24 An open-source hot backup utility for MySQL-based servers that doesn’t lock your database during the backup.
HAProxy 2.5.12 A high-availability and load-balancing solution for Percona XtraDB Cluster. This is a default proxy.
ProxySQL 2.4.8 A high performance, high-availability, protocol-aware proxy for MySQL.
Percona Toolkit 3.5.1 The set of scripts to simplify and optimize database operation.
relication_manager.sh 1.0 A tool to manage multi-source replication between multiple Percona XtraDB Cluster clusters.

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