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Percona Server for MySQL 8.4.8-8 (2025-03-12)

Get started with Quickstart Guide for Percona Server for MySQL.

Percona Server for MySQL 8.4.8-8 includes all the features and bug fixes available in the MySQL 8.4.8 Community Edition in addition to enterprise-grade features developed by Percona.

Release highlights

MySQL 8.4.8

Improvements and bug fixes introduced by Oracle for MySQL 8.4.8 and included in Percona Server for MySQL are the following:

  • The warning associated with redo logging being disabled is no longer present, as the underlying condition that triggered the warning has been eliminated. (Bug #37645185)

  • A problem affecting the handling of large insert operations has been corrected, improving stability during bulk data loads. (Bug #38208188)

  • An error that could arise when running certain SQL statements has been resolved. (Bug #38573285)

  • Issues encountered when generating table definitions via SHOW CREATE TABLE have been fixed. (Bug #38448700)

  • Bug #38298692 was addressed as part of the same fix set as Bug #38448700, resolving related inconsistencies in table metadata handling. (Bug #38298692)

  • Performance regressions affecting queries that rely on regular expression matching have been corrected. (Bug #114056, Bug #36326728)

  • The bundled OpenSSL dependency has been updated, addressing the issue tracked under Bug #38632932. (Bug #38632932)

  • A concurrency flaw in InnoDB that could occur when executing SQL through the que_eval_sql interface has been removed. (Bug #118705, Bug #38310595)

  • A timing issue that allowed binary logs to be removed before persisted expiration settings were fully applied has been fixed. (Bug #38554467)

  • A fault affecting clustered environments, where multiple instances could lose connectivity under specific conditions, has been corrected. (Bug #38380392)

  • Several defects that prevented connections from closing properly when using the Thread Pool have been resolved. (Bug #38170188, Bug #36782728, Bug #38549372)

  • An issue that caused gaps in GTID sequences when the replica_skip_errors option was enabled has been fixed. (Bug #28590993)

Find the complete list of bug fixes and changes in the MySQL 8.4.8 release notes .

Bug Fixes

  • PS-9828: The Audit Log Filter could crash when audit_log_filter.file pointed to a non-existent directory.

  • PS-10229: The audit_log_filter_remove_filter failed after upgrading from Percona Server for MySQL 8.0 to 8.4.6 due to an index being renamed from filter_name to filtername. The issue resulted in the error: ERROR: Failed to remove filter from users table.

  • PS-10232: MySQL 8.0.40 and later could be about 2–3 times slower than 8.0.39 in a particular index scan scenario.

  • PS-10260: Expanded Fast Index Creation could fail with partitioned tables.

  • PS-10287: A table definition mismatch between MyRocks and the data dictionary after a crash could cause a crash or assertion failures.

  • PS-10332: MySQL terminated with signal SIGABRT when an invalid value was specified for audit-log-filter.compression.

  • PS-10345: The Audit Log Filter could crash when the definition passed to audit_log_filter_set_filter() contained invalid data replacement fields.

  • PS-10347: The AuditJsonHandler used by the audit_log_read UDF could return malformed JSON.

  • PS-10383: The MeCab plugin did not enforce phrase adjacency for quoted phrase search in BOOLEAN MODE.

  • PS-10387: The audit_log_read() function ignored max_array_length and had pagination issues.

  • PS-10446: Back-ported the fix for Bug #118512 (missing semi-join condition causes incorrect result) to 8.4.

  • PS-10447: Back-ported the fix for Bug #119606 (assertion failure in item_func.cc:3937) to 8.4.

  • PS-10545: MySQL Test Run (MTR) --only-big-test incorrectly skipped tests that included both big_test.inc and no_valgrind_without_big.inc.

  • PS-10591: On systems running OpenSSL 3.4 or later (for example, Debian Trixie and Oracle Linux 10), the use of SHAKE128 and SHAKE256 resulted in an assertion failure. Because SHAKE algorithms are extendable-output functions (XOFs), EVP_MD_CTX_size() returned 0, which triggered assert(digest_size > 0) in finalize(). The implementation was updated to properly handle XOF algorithms and to use EVP_DigestFinalXOF() instead of EVP_DigestFinal_ex() for finalizing XOF digests.

Additional resources