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Percona XtraDB Cluster 8.4.6-6 (2025-10-06)

Percona XtraDB Cluster (PXC) supports critical business applications in both cloud and on-premises environments, including public, private, and hybrid setups. 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 8.4.6-6 is based on Percona Server for MySQL and includes all improvements and bug fixes available in the Percona Server for MySQL 8.4.6-6 (2025-09-08) release notes.

Percona XtraDB Cluster 8.4.6-6

Percona XtraDB Cluster now prevents a node from automatically attempting a State Snapshot Transfer (SST) after a failed Incremental State Transfer (IST).

Percona XtraDB Cluster 8.4.6-6 Pro build

The Percona XtraDB Cluster Pro xtrabackup SST (State Snapshot Transfer) method, based on Percona XtraBackup Pro, now uses the Reduced backup lock time feature. This enhancement minimizes blocking on the Donor node during SST process while the backup is being prepared. The Percona XtraBackup reduced lock feature is enabled by default. To modify this behavior, set the desired lock_ddl value in the [xtrabackup] section of the my.cnf configuration file. For more information about the --lock-ddl option and its available values, refer to the xtrabackup command-line options documentation.

Percona Server for MySQL 8.4.6-6

Implements Link-Time Optimization (LTO) to generate more optimized release binaries, resulting in improved performance for specific workloads.

MySQL 8.4.6

Bug fixes introduced by Oracle for MySQL 8.4.6 and included in Percona Server for MySQL are the following:

  • Fixed an issue where rebuilding a primary key with duplicate entries could cause the server to stop unexpectedly. (Bug #37822992)

  • Fixed an issue related to dropping columns that were part of an index. (Bug #37726881)

  • Fixed an issue with indexing spatial datatype columns. (Bug #36682518)

  • Fixed an issue where creating a secondary index on a VARCHAR column could exceed configured memory limits, with the amount allocated being directly related to the value of innodb_ddl_buffer_size, leading to errors such as ERROR 1136 (21S01): Column count doesn’t match value count at row 1. (Bug #37233273)

Find the complete list of bug fixes and changes in the MySQL 8.4.6 release notes.

New features

  • PXC-4631: Percona XtraDB Cluster now prevents a node from automatically attempting a State Snapshot Transfer (SST) after a failed Incremental State Transfer (IST).

Bug fixes

  • PXC-4392: The issue was resolved by PXB-3470, which occurred when users had large databases containing compressed tables.

  • PXC-4644: Creating a foreign key (FK) without sufficient privileges causes a cluster inconsistency. The node where the command is executed fails with Error 1216 (Cannot add or drop foreign key constraint), while other nodes in the cluster that replicate the event fail with Error 1452 (Cannot add or update a child row: a foreign key constraint fails).

Build & packaging notes

  • The official packages were built with the WITH_LTO=ON flag to enable the Link-Time Optimization (LTO) feature.

  • This release adds support for Red Hat Enterprise Linux 10.