Upgrading from MariaDB 10.4 to MariaDB 10.5

How to Upgrade

For Windows, see Upgrading MariaDB on Windows instead.

Before you upgrade, it would be best to take a backup of your database. This is always a good idea to do before an upgrade. We would recommend Mariabackup.

The suggested upgrade procedure is:

Modify the repository configuration, so the system's package manager installs MariaDB 10.5. For example,
- On Debian, Ubuntu, and other similar Linux distributions, see Updating the MariaDB APT repository to a New Major Release for more information.
- On RHEL, CentOS, Fedora, and other similar Linux distributions, see Updating the MariaDB YUM repository to a New Major Release for more information.
- On SLES, OpenSUSE, and other similar Linux distributions, see Updating the MariaDB ZYpp repository to a New Major Release for more information.
Stop MariaDB.
Uninstall the old version of MariaDB.
- On Debian, Ubuntu, and other similar Linux distributions, execute the following:
  sudo apt-get remove mariadb-server
- On RHEL, CentOS, Fedora, and other similar Linux distributions, execute the following:
  sudo yum remove MariaDB-server
- On SLES, OpenSUSE, and other similar Linux distributions, execute the following:
  sudo zypper remove MariaDB-server
Install the new version of MariaDB.
- On Debian, Ubuntu, and other similar Linux distributions, see Installing MariaDB Packages with APT for more information.
- On RHEL, CentOS, Fedora, and other similar Linux distributions, see Installing MariaDB Packages with YUM for more information.
- On SLES, OpenSUSE, and other similar Linux distributions, see Installing MariaDB Packages with ZYpp for more information.
Make any desired changes to configuration options in option files, such as my.cnf. This includes removing any options that are no longer supported.
Start MariaDB.
Run mysql_upgrade.
- mysql_upgrade does two things:
  1. Ensures that the system tables in the#mysql database are fully compatible with the new version.
  2. Does a very quick check of all tables and marks them as compatible with the new version of MariaDB .

Incompatible Changes Between 10.4 and 10.5

On most servers upgrading from 10.4 should be painless. However, there are some things that have changed which could affect an upgrade:

Binary name changes

All binaries previously beginning with mysql now begin with mariadb, with symlinks for the corresponding mysql command.

Usually that shouldn't cause any changed behavior, but when starting the MariaDB server via systemd, or via the mysqld_safe script symlink, the server process will now always be started as mariadbd, not mysqld.

So anything looking for the mysqld name in the system process list, like e.g. monitoring solutions, now needs for mariadbd instead when the server / service is not started directly, but via mysqld_safe or as a system service.

GRANT PRIVILEGE changes

A number of statements changed the privileges that they require. The old privileges were historically inappropriately chosen in the upstream. 10.5.2 fixes this problem. Note, these changes are incompatible to previous versions. A number of GRANT commands might be needed after upgrade.

SHOW BINLOG EVENTS now requires the BINLOG MONITOR privilege (requred REPLICATION SLAVE prior to 10.5.2).
SHOW SLAVE HOSTS now requires the REPLICATION MASTER ADMIN privilege (required REPLICATION SLAVE prior to 10.5.2).
SHOW SLAVE STATUS now requires the REPLICATION SLAVE ADMIN or the SUPER privilege (required REPLICATION CLIENT or SUPER prior to 10.5.2).
SHOW RELAYLOG EVENTS now requires the REPLICATION SLAVE ADMIN privilege (required REPLICATION SLAVE prior to 10.5.2).

Options That Have Changed Default Values

Option	Old default value	New default value
innodb_adaptive_hash_index	ON	OFF
innodb_checksum_algorithm	crc32	full_crc32
innodb_log_optimize_ddl	ON	OFF
slave_parallel_mode	conservative	optimistic
performance_schema_max_cond_classes	80	90
performance_schema_max_file_classes	50	80
performance_schema_max_mutex_classes	200	210
performance_schema_max_rwlock_classes	40	50
performance_schema_setup_actors_size	100	-1
performance_schema_setup_objects_size	100	-1

Options That Have Been Removed or Renamed

The following options should be removed or renamed if you use them in your option files:

Option	Reason
innodb_checksums	Deprecated and functionality replaced by innodb_checksum_algorithms in MariaDB 10.0.
idle_flush_pct	Has had no effect since merging InnoDB 5.7 from mysql-5.7.9 (MariaDB 10.2.2).
innodb_locks_unsafe_for_binlog	Deprecated in MariaDB 10.0. Use READ COMMITTED transaction isolation level instead.
innodb_rollback_segments	Deprecated and replaced by innodb_undo_logs in MariaDB 10.0.
innodb_stats_sample_pages	Deprecated in MariaDB 10.0. Use innodb_stats_transient_sample_pages instead.
max_long_data_size	Deprecated and replaced by max_allowed_packet in MariaDB 5.5.
multi_range_count	Deprecated and has had no effect since MariaDB 5.3.
thread_concurrency	Deprecated and has had no effect since MariaDB 5.5.
timed_mutexes	Deprecated and has had no effect since MariaDB 5.5.

Deprecated Options

The following options have been deprecated. They have not yet been removed, but will be in a future version, and should ideally no longer be used.

Option	Reason
innodb_adaptive_max_sleep_delay	No need for thread throttling any more.
innodb_background_scrub_data_check_interval	Problematic ‘background scrubbing’ code removed.
innodb_background_scrub_data_interval	Problematic ‘background scrubbing’ code removed.
innodb_background_scrub_data_compressed	Problematic ‘background scrubbing’ code removed.
innodb_background_scrub_data_uncompressed	Problematic ‘background scrubbing’ code removed.
innodb_buffer_pool_instances	Having more than one buffer pool is no longer necessary.
innodb_commit_concurrency	No need for thread throttling any more.
innodb_concurrency_tickets	No need for thread throttling any more.
innodb_log_files_in_group	Redo log was unnecessarily split into multiple files. Limited to 1 from MariaDB 10.5.
innodb_log_optimize_ddl	Prohibited optimizations.
innodb_page_cleaners	Having more than one page cleaner task no longer necessary.
innodb_replication_delay	No need for thread throttling any more.
innodb_scrub_log	Never really worked as intended, redo log format is being redone.
innodb_scrub_log_speed	Never really worked as intended, redo log format is being redone.
innodb_thread_concurrency	No need for thread throttling any more.
innodb_thread_sleep_delay	No need for thread throttling any more.
innodb_undo_logs	It always makes sense to use the maximum number of rollback segments.
large_page_size	Unused since multiple page size support was added.

Major New Features To Consider

You might consider using the following major new features in MariaDB 10.5:

The S3 storage engine allows one to archive MariaDB tables in Amazon S3, or any third-party public or private cloud that implements S3 API.
ColumnStore columnar storage engine.
See also System Variables Added in MariaDB 10.5.