Release Notes for MariaDB Enterprise Server 10.4.12-6


This sixth release of MariaDB Enterprise Server 10.4 is a maintenance release, including a variety of fixes.

MariaDB Enterprise Server 10.4.12-6 was released on 2020-03-02.

Fixed Security Vulnerabilities

CVE (with link)

CVSS base score





Notable Changes

  • The systemd start and stop timeout for the MariaDB service is now set to 900 seconds (15 minutes). (MDEV-17571)

  • MariaDB ColumnStore 1.4.3 is included in this release. Specific details on this component may be found in the ColumnStore 1.4.3 release notes.

  • For MariaDB Enterprise Cluster (Galera Library 26.4.4):

    • Setting socket.recv_buf_size was not effective because it was done after the socket was connected or accepted. The default value also caused TCP receive buffer auto-tuning to be disabled. This lead to sub-optimal performance in high bandwidth WAN clusters. The default value for socket.recv_buf_size has been changed to auto, which lets the kernel tune the TCP receive buffer. A new variable socket.send_buf_size with default value auto was added to allow send buffer tuning.

  • The ENFORCE option for parameter slave-run-triggers-for-rbr can now be used to assure that triggers defined on a table on the replica are executed for row based replication (RBR) when a trigger on a primary (master) exists for this table. The LOGGING option already exists, but only allows to execute triggers on the replica for row based replication if no trigger exists for this table on the primary (master). (MENT-607)

  • On Windows: Removed a misleading OS error 203 logged by InnoDB in the error log when the datadir is defined as a network resource. (MDEV-21260)

Issues Fixed

Can result in a hang or crash

Can result in unexpected behavior

  • Executing TRUNCATE or OPTIMIZE on InnoDB tables could lead to an unexpected SQL Error (1118): Row size too large, when innodb_strict_mode=ON (default). (MDEV-21429)

  • Queries which use window functions and implicit grouping could return wrong results. (MDEV-21318)

  • Queries which use DISTINCT COUNT(*) OVER() in the expression returned wrong results. (MDEV-16579)

  • Inefficient thread handling in the thread pool, impacting any application that uses the thread pool. (MDEV-21343)

  • The MariaDB Enterprise Server config file mariadb-enterprise.cnf was not registered as a config file in RPM packages. (MENT-591)

  • ALTER USER IF EXISTS generated a SQL syntax error. (MENT-643)

  • A query using GROUP BY with an expression containing a field of a view could return wrong results. (MDEV-20922)

  • Running the script mysql_tzinfo_to_sql for MariaDB Enterprise Cluster could result in inconsistent timezone information across different nodes. (MDEV-21209)

  • Using the --use-memory option with mariabackup would cause it to run out of memory. (MDEV-20679)

  • For MariaDB Enterprise Cluster (Galera Library 26.4.4):

    • GCS delivered a JOIN message even if the node was in a DONOR state.

    • GCache could contain mixed histories from different clusters.

    • GComm socket timestamping/liveness checking produced false positives during replication of large transactions, which caused excessive amounts of broken connections.

    • Large transactions were able to monopolize bandwidth when segmentation was configured, causing delayed in messages relayed by segment representative. The fix implements fair queuing of messages.

    • Due to a bug in quorum computation, two primary conflicting primary components were formed when the group merged and partitioned again while the new primary view was forming.

  • A range plan was not always used for multi-join queries. (MDEV-21383)

  • An ALTER TABLE on an InnoDB table adding a new first column which is used to define system versioning period could lead to unexpected errors. This only happened when the transaction-based system version was used. (MDEV-18865, MDEV-18875)

Interface Changes


In alignment to the enterprise lifecycle, MariaDB Enterprise Server 10.4.12-6 is provided for:

  • Red Hat Enterprise Linux 8

  • Red Hat Enterprise Linux 7

  • Red Hat Enterprise Linux 6

  • CentOS 8

  • CentOS 7

  • CentOS 6

  • Ubuntu 18.04

  • Ubuntu 16.04

  • Debian 10

  • Debian 9

  • Debian 8

  • SUSE Linux Enterprise Server 15

  • SUSE Linux Enterprise Server 12

  • Microsoft Windows

Some components of MariaDB Enterprise Server might not support all platforms. For additional information, see "MariaDB Corporation Engineering Policies".


CentOS 6, Debian 8, and Red Hat Enterprise Linux 6 are no longer supported as per the MariaDB Engineering Policy. Older releases are available from the MariaDB Downloads page. Instructions for installation are included as a README file within the download.