Release Notes for MariaDB Enterprise Server 10.3.20-4


This fourth release of MariaDB Enterprise Server 10.3 is a maintenance release, including a variety of fixes.

MariaDB Enterprise Server 10.3.20-4 was released on 2019-11-18.

Fixed Security Vulnerabilities

CVE (with link)

CVSS base score







Notable Changes

  • New option innodb_change_buffer_dump added to Debug builds. This option dumps the contents of the InnoDB change buffer to the server error log at startup. This is useful when a slow shutdown cannot be performed successfully. (MDEV-20864)

  • Eliminated unnecessary logging of warnings to the error log regarding InnoDB maximum row size for DML statements which should be present only for DDL operations. (MENT-454)

Issues Fixed

Can result in data loss

  • mariabackup --prepare --export ... could overwrite binary logs if certain conditions were present. (MDEV-20703)

    Conditions which must be present to trigger this bug:

    • mariabackup is executed on the MariaDB Server host, and

    • Configuration files from the master are used, and

    • Configuration files enable binary logging

    If unable to upgrade to MariaDB Enterprise Server 10.3.20-4, where this bug is fixed, a workaround is available: use the --defaults option to mariabackup to avoid the bug-triggering conditions by specifying a different configuration file.

Can result in a hang or crash

Can result in unexpected behavior

  • Unnecessary logging of warnings to the error log regarding InnoDB maximum row size for DML statements which should be present only for DDL operations. (MENT-454)

  • After server restart, a SELECT using a FULLTEXT index on InnoDB tables can fail to return some data. (MDEV-19073)

  • MariaDB Enterprise Backup and MariaDB Backup, when using mbstream, recreated xtrabackup_info in the same directory as the backup file. Repeated extract of the backup could fail. (MDEV-18438)

  • script could not be launched and returned a syntax error. (MENT-433)

  • Though not supported on Microsoft Windows, the server_audit_output_type system variable for the Audit plugin accepted a SYSLOG value. (MDEV-19851)

  • FOREIGN KEY constraints have been ignored during DELETE when parent table is System-Versioned. (MDEV-16210)

  • DELETE from child table with FOREIGN KEY was not possible when the table is System-Versioned. (MDEV-20812)

Interface Changes



In alignment to the enterprise lifecycle, MariaDB Enterprise Server 10.3.20-4 is provided for:

  • CentOS 8

  • CentOS 7

  • CentOS 6

  • Debian 10

  • Debian 9

  • Debian 8

  • Red Hat Enterprise Linux 8

  • Red Hat Enterprise Linux 7

  • Red Hat Enterprise Linux 6

  • SUSE Linux Enterprise Server 15

  • SUSE Linux Enterprise Server 12

  • Ubuntu 18.04

  • Ubuntu 16.04

  • 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.