percona · alina-derkach-oaza · Jun 3, 2025
diff --git a/docs/release-notes/8.4.4-5.md b/docs/release-notes/8.4.4-5.md
@@ -0,0 +1,116 @@
+# Percona XtraDB Cluster 8.4.5-5 (2025-06-)
+
+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 8.4.5-5 is based on Percona Server for MySQL and includes all improvements and bug fixes available in the [Percona Server for MySQL 8.4.5-5 (2025-05-29) release notes](https://docs.percona.com/percona-server/8.4/release-notes/8.4.5-5.html).
+
+### Percona XtraDB Cluster 8.4.5-5
+
+Improves State Snapshot Transfer (SST) failure diagnostics. `garbd` now uses distinct exit codes to differentiate between donor exit, SST script failure, and garbd-initiated termination, making SST issues easier to identify and debug.
+
+### Percona Server for MySQL 8.4.5-5
+
+* Updates the C++ level of the KMPI library to enhance error handling capabilities.
+
+* Improves optimizer behavior by restoring correct handling of const tables in `test_quick_select()`. A MySQL Upstream refactor (commit [9a13c1c](https://github.com/percona/percona-server/commit/9a13c1c6971f4bd56d143179ecfb34cca8ecc018)) removed the `QEP_TAB` dependency, causing `get_quick_record_count()` to no longer pass const table information. This could lead to suboptimal range scan boundaries. The applied patch resolves the issue by explicitly passing `const_tables` to `test_quick_select()`, ensuring consistent behavior with the pre-refactor logic.
+
+The latest MyRocks storage engine incorporates code based on RocksDB version 9.3.1. Percona has applied minor modifications to the original RocksDB codebase. Check the list of modifications at [https://github.com/percona/rocksdb/](https://github.com/percona/rocksdb/commit/2864cd95ca72bc4a2e93fe461dbd980f8e2357be).
+
+This release adds the following changes to the list of [MyRocks variables](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html).
+
+**Adds new MyRocks variables**
+
+* [`--rocksdb_bulk_load_compression_parallel_threads`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_bulk_load_compression_parallel_threads)
+* [`--rocksdb_bulk_load_enable_unique_key_check`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_bulk_load_enable_unique_key_check)
+* [`--rocksdb_debug_skip_bloom_filter_check_on_iterator_bounds`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_debug_skip_bloom_filter_check_on_iterator_bounds)
+* [`--rocksdb_enable_udt_in_mem`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_enable_udt_in_mem)
+* [`--rocksdb_invalid_create_option_action`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_invalid_create_option_action)
+* [`--rocksdb_io_error_action`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_io_error_action)
+* [`--rocksdb_table_stats_skip_system_cf`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_table_stats_skip_system_cf)
+* [`--rocksdb_use_io_uring`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_use_io_uring)
+* [`--rocksdb_enable_instant_ddl`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_enable_instant_ddl)
+* [`--rocksdb_enable_instant_ddl_for_append_column`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_enable_instant_ddl_for_append_column)
+* [`--rocksdb_enable_instant_ddl_for_column_default_changes`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_enable_instant_ddl_for_column_default_changes)
+* [`--rocksdb_enable_instant_ddl_for_drop_index_changes`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_enable_instant_ddl_for_drop_index_changes)
+* [`--rocksdb_enable_instant_ddl_for_table_comment_changes`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_enable_instant_ddl_for_table_comment_changes)
+* [`--rocksdb-bulk-load-compression-parallel-threads`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_bulk_load_compression_parallel_threads)
+* [`--rocksdb-bulk-load-enable-unique-key-check`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_bulk_load_enable_unique_key_check)
+* [`--rocksdb-debug-skip-bloom-filter-check-on-iterator-bounds`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_debug_skip_bloom_filter_check_on_iterator_bounds)
+
+**Changes default values of MyRocks variables**
+
+* [`--rocksdb_disable_instant_ddl`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_disable_instant_ddl) - the default value is changed from `ON` to `OFF`.
+
+* [`--rocksdb_file_checksums`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_file_checksums) - the data type is changed from `Boolean` to `ENUM`. Also, the default value is changed from `OFF` to `CHECKSUMS_OFF`.
+
+* [`--rocksdb_compaction_readahead_size`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_compaction_readahead_size) - the default value is changed from `0` (zero) to `2097152`.
+
+**Deprecates MyRocks variable**
+
+* [`--rocksdb_disable_instant_ddl`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_disable_instant_ddl) - this variable is being deprecated and is expected to be removed in a future release.
+
+**Removes MyRocks variables**
+
+* [`--rocksdb-access-hint-on-compaction-start`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_access_hint_on_compaction_start)
+* [`--rocksdb_large_prefix`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_large_prefix)
+* [`--rocksdb_strict_collation_check`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_strict_collation_check)
+* [`--rocksdb_strict_collation_exceptions`](https://docs.percona.com/percona-server/8.4/myrocks-server-variables.html#rocksdb_strict_collation_exceptions)
+
+### MySQL 8.4.5
+
+Improvements and bug fixes introduced by Oracle for MySQL 8.4.5 and included in Percona Server for MySQL are the following:
+
+* Fixed an issue where `CHECK TABLE` sometimes incorrectly reported that spatial indexes were corrupted. (Bug #37286473)
+
+* Fixed an issue in InnoDB redo log recovery to improve data safety after a crash. (Bug #37061960)
+
+* Fixed an issue where reading `index_id` values could lead to incorrect behavior with indexes. (Bug #36993445, Bug #37709706)
+
+* Fixed a bug related to the `lower_case_table_names` setting that caused inconsistent behavior with table names on different systems. (Bug #32288105)
+
+* Fixed a bug where `mysqldump` did not properly escape certain special characters in its output. (Bug #37540722, Bug #37709163)
+
+* The `fprintf_string()` function in `mysqldump` did not use the correct quote character for escaping strings. (Bug #37607195)
+
+Find the complete list of bug fixes and changes in the [MySQL 8.4.5 release notes](https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-5.html).
+
+## Improvements
+
+[PXC-4645](https://perconadev.atlassian.net/browse/PXC-4645): Improves State Snapshot Transfer (SST) failure diagnostics. `garbd` now uses distinct exit codes to differentiate between donor exit, SST script failure, and garbd-initiated termination, making SST issues easier to identify and debug.
+
+## Bug fixes
+
+* [PXC-3576](https://perconadev.atlassian.net/browse/PXC-3576): Percona XtraDB Cluster created role mappings using an upper-case database name when `lower_case_table_names=1` was set.
+
+* [PXC-4394](https://perconadev.atlassian.net/browse/PXC-4394): Improved error reporting for scenarios where Percona Xtrabackup, used during State Snapshot Transfer (SST), failed to report its version. These failures may be caused by missing libraries or a broken installation.
+
+* [PXC-4399](https://perconadev.atlassian.net/browse/PXC-4399): Executing `FLUSH TABLES` on a table while writes were in progress caused the cluster node to stall.
+
+* [PXC-4512](https://perconadev.atlassian.net/browse/PXC-4512): When `RENAME TABLE` was executed on a child table concurrently with `INSERT`/`UPDATE` on a parent table, a Metadata Lock (MDL) BF-BF conflict occured on the replica, causing two cluster nodes to enter NON-PRIMARY state.
+
+* [PXC-4629](https://perconadev.atlassian.net/browse/PXC-4629): Creating a temporary table with `CREATE TEMPORARY TABLE ... AS SELECT` put the entire session into Transaction Ordered Index (TOI ) / Next Binary Operation (NBO) lock state, preventing any queries from being killed within that session.
+
+* [PXC-4638](https://perconadev.atlassian.net/browse/PXC-4638): After performing State Snapshot Transfer (SST), the `binlog.index` file contents became inconsistent, causing the `binlog_utils_udf` plugin to fail when accessing the binlog file. Was fixed within [PS-9777](https://perconadev.atlassian.net/browse/PS-9777).
+
+* [PXC-4652](https://perconadev.atlassian.net/browse/PXC-4652): Fixed a segmentation fault (SIGSEGV) on nodes with `wsrep_applier_threads > 1` under high write activity.
+
+* [PXC-4657](https://perconadev.atlassian.net/browse/PXC-4657): There was Metadata Lock (MDL) BF-BF conflict between two applier threads.
+
+* [PXC-4684](https://perconadev.atlassian.net/browse/PXC-4684): An `UPDATE` query that referenced two tables but only modified one could cause an Metadata Lock (MDL) BF-BF conflict on other cluster nodes.
+
+* [PXC-4664](https://perconadev.atlassian.net/browse/PXC-4664): Executing transactions with the same Global Transaction Identifier (GTID)  on different nodes caused a node to exit.
+
+* [PXC-4688](https://perconadev.atlassian.net/browse/PXC-4688): A regression in asynchronous replication caused the replica thread to stall when processing empty transactions. 
+
+## Useful links
+
+* The [Percona XtraDB Cluster installation instructions](https://www.percona.com/doc/percona-xtradb-cluster/8.4/install/index.html)
+
+* The [Percona XtraDB Cluster downloads](https://www.percona.com/downloads/Percona-XtraDB-Cluster-LATEST/#)
+
+* The [Percona XtraDB Cluster GitHub location](https://github.com/percona/percona-xtradb-cluster)
+
+* To contribute to the documentation, review the [Documentation Contribution Guide](https://github.com/percona/pxc-docs/blob/8.0/contributing.md)
+
diff --git a/docs/release-notes/release-notes_index.md b/docs/release-notes/release-notes_index.md
@@ -1,5 +1,7 @@
 # Percona XtraDB Cluster {{vers}} release notes index
 
+* [Percona XtraDB Cluster 8.4.5-5 (2025-06-)](8.4.5-5.md)
+
 * [Percona XtraDB Cluster 8.4.4-4 (2025-04-16)](8.4.4-4.md)
 
 * [Percona XtraDB Cluster 8.4.3-3 (2025-01-21)](8.4.3-3.md)

diff --git a/docs/templates/pdf_cover_page.tpl b/docs/templates/pdf_cover_page.tpl
@@ -7,5 +7,5 @@
 {% if config.site_description %}
 <h1>{{ config.site_description }}</h1>
 {% endif %} 
-<h2>8.4.4-4 (April 16, 2025)</h2>
+<h2>8.4.5-5 (June , 2025)</h2>
 <!--<h3>Percona Technical Documentation Team</h3>-->
diff --git a/mkdocs-base.yml b/mkdocs-base.yml
@@ -170,6 +170,7 @@ nav:
   - get-help.md
   - Release notes:
       - Release notes index: release-notes/release-notes_index.md
+      - release-notes/8.4.5-5.md
       - release-notes/8.4.4-4.md
       - release-notes/8.4.3-3.md 
       - release-notes/8.4.2-2.md 

diff --git a/variables.yml b/variables.yml
@@ -1,8 +1,8 @@
 # variables for HTML output
 
-release: '8.4.4-4'
+release: '8.4.5-5'
 version: '8.4'
 vers: '8.4' # we are going to use it instead of version
 pkg: 'pxc-84-lts'
-release_date: '2025-04-16'
-title_date: '2025-04-16'
+release_date: '2025-06-'
+title_date: '2025-06-'