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Percona XtraDB Cluster Documentation

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Percona XtraDB Cluster 8.0.29-21 (2022-09-12)

Percona XtraDB Cluster (PXC) supports critical business applications in your public, private, or hybrid cloud environment. Our free, open source, enterprise-grade solution includes the high availability and security features your business requires to meet your customer expectations and business goals.

Release Highlights

Percona XtraDB Cluster is based on Percona Server for MySQL. Find a complete list of improvements and bug fixes in the Percona Server for MySQL 8.0.29-21 (2022-08-08) release notes.

The improvements and bug fixes for MySQL 8.0.29, provided by Oracle, and included in Percona Server for MySQL are the following:

The Performance Schema tracks if a query was processed on the PRIMARY engine, InnoDB, or a SECONDARY engine, HeatWave. An EXECUTION_ENGINE column, which indicates the engine used, was added to the Performance Schema statement event tables and the sys.processlist and the sys.x$processlist views.

Added support for the IF NOT EXISTS option for the CREATE FUNCTION, CREATE PROCEDURE, and CREATE TRIGGER statements.

Added support for ALTER TABLE … DROP COLUMN ALGORITHM=INSTANT.

An anonymous user with the PROCESS privilege was unable to select processlist table rows.

Find the full list of bug fixes and changes in the MySQL 8.0.29 Release Notes.

Note

Percona Server for MySQL has changed the default for the supported DDL column operations to ALGORITHM=INPLACE. This change fixes the corruption issue with the INSTANT ADD/DROP COLUMNS (find more details in PS-8292.

In MySQL 8.0.29, the default setting for supported DDL operations is ALGORITHM=INSTANT. You can explicitly specify ALGORITHM=INSTANT in DDL column operations.

Bugs Fixed

  • PXC-3982: When the replica node is also an asynchronous slave and, while joining the cluster, this node was not ready to accept connections, a SQL thread failed at the start.

  • PXC-3118: A fix for when, using a thread pool, a brute force abort for a metadata locking (MDL) subsystem conflict stalled.

  • PXC-3999: The cluster was stalled on Waiting for acl cache lock with concurrent user DDL commands.

Packaging Notes

Debian 9 is no longer supported.