# Upgrading from MariaDB 10.5 to MariaDB 10.6
### How to Upgrade
For Windows, see [Upgrading MariaDB on Windows](/docs/server/server-management/install-and-upgrade-mariadb/upgrading/platform-specific-upgrade-guides/upgrading-mariadb-on-windows.md).
For MariaDB Galera Cluster, see [Upgrading from MariaDB 10.5 to MariaDB 10.6 with Galera Cluster](/docs/galera-cluster/galera-management/upgrading-galera-cluster/upgrading-from-mariadb-10-5-to-mariadb-10-6-with-galera-cluster.md).
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 [mariadb-backup](/docs/server/server-usage/backup-and-restore/mariadb-backup/mariadb-backup-overview.md).
The suggested upgrade procedure is:
1. Modify the repository configuration, so the system's package manager installs [MariaDB 10.6](/docs/release-notes/community-server/10.6/what-is-mariadb-106.md).
1. On Debian, Ubuntu, and other similar Linux distributions, see [Updating the MariaDB APT repository to a New Major Release](/docs/server/server-management/install-and-upgrade-mariadb/installing-mariadb/binary-packages/installing-mariadb-deb-files.md#updating-the-mariadb-apt-repository-to-a-new-major-release) for more information.
2. On RHEL, CentOS, Fedora, and other similar Linux distributions, see [Updating the MariaDB YUM repository to a New Major Release](/docs/server/server-management/install-and-upgrade-mariadb/installing-mariadb/binary-packages/rpm/yum.md#updating-the-mariadb-yum-repository-to-a-new-major-release) for more information.
3. On SLES, OpenSUSE, and other similar Linux distributions, see [Updating the MariaDB ZYpp repository to a New Major Release](/docs/server/server-management/install-and-upgrade-mariadb/installing-mariadb/binary-packages/rpm/installing-mariadb-with-zypper.md#updating-the-mariadb-zypp-repository-to-a-new-major-release) for more information.
2. [Stop MariaDB](/docs/server/server-management/starting-and-stopping-mariadb/starting-and-stopping-mariadb-automatically.md).
3. Uninstall the old version of MariaDB.
1. On Debian, Ubuntu, and other similar Linux distributions, execute the following: `sudo apt-get remove mariadb-server`
2. On RHEL, CentOS, Fedora, and other similar Linux distributions, execute the following: `sudo yum remove MariaDB-server`
3. On SLES, OpenSUSE, and other similar Linux distributions, execute the following: `sudo zypper remove MariaDB-server`
4. Install the new version of MariaDB.
1. On Debian, Ubuntu, and other similar Linux distributions, see [Installing MariaDB Packages with APT](/docs/server/server-management/install-and-upgrade-mariadb/installing-mariadb/binary-packages/installing-mariadb-deb-files.md#installing-mariadb-packages-with-apt) for more information.
2. On RHEL, CentOS, Fedora, and other similar Linux distributions, see [Installing MariaDB Packages with YUM](/docs/server/server-management/install-and-upgrade-mariadb/installing-mariadb/binary-packages/rpm/yum.md#installing-mariadb-packages-with-yum) for more information.
3. On SLES, OpenSUSE, and other similar Linux distributions, see [Installing MariaDB Packages with ZYpp](/docs/server/server-management/install-and-upgrade-mariadb/installing-mariadb/binary-packages/rpm/installing-mariadb-with-zypper.md#installing-mariadb-packages-with-zypp) for more information.
5. Make any desired changes to configuration options in [option files](/docs/server/server-management/install-and-upgrade-mariadb/configuring-mariadb/configuring-mariadb-with-option-files.md), such as `my.cnf`. This includes removing any options that are no longer supported.
6. [Start MariaDB](/docs/server/server-management/starting-and-stopping-mariadb/starting-and-stopping-mariadb-automatically.md).
7. Run [mariadb-upgrade](/docs/server/clients-and-utilities/deployment-tools/mariadb-upgrade.md), to:
1. Ensure that the system tables in the [mysql](/docs/server/reference/system-tables/the-mysql-database-tables.md) database are fully compatible with the new version.
2. Perform a very quick check of all tables and marks them as compatible with the new version of MariaDB.
### Incompatible Changes Between 10.5 and 10.6
On most servers upgrading from 10.5 should be painless. However, there are some things that have changed which could affect an upgrade:
The bahaviour of sorting non-deterministic variables in a Select query can be changed ,\
see ([MDEV-27745](https://jira.mariadb.org/browse/MDEV-27745))
#### Reserved Word
* New [reserved word](/docs/server/reference/sql-structure/sql-language-structure/reserved-words.md): `OFFSET`. This can no longer be used as an [identifier](/docs/server/reference/sql-structure/sql-language-structure/identifier-names.md) without being quoted.
#### InnoDB COMPRESSED Row Format
From MariaDB 10.6.0 until MariaDB 10.6.5, tables that are of the `COMPRESSED` row format are read-only by default. This was intended to be the first step towards removing write support and deprecating the feature.
This plan has been scrapped, and from MariaDB 10.6.6, `COMPRESSED` tables are no longer read-only by default.
From MariaDB 10.6.0 to MariaDB 10.6.5, set the [innodb\_read\_only\_compressed](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_read_only_compressed) variable to `OFF` to make the tables writable.
#### Character Sets
From MariaDB 10.6, the `utf8` [character set](/docs/server/reference/data-types/string-data-types/character-sets.md) (and related collations) is by default an alias for `utf8mb3` rather than the other way around. It can be set to imply `utf8mb4` by changing the value of the [old\_mode](/docs/server/server-management/variables-and-modes/server-system-variables.md#old_mode) system variable.
#### Options That Have Changed Default Values
| Option | Old default value | New default value |
| ------------------------------------------------------------------------------------------------------------------------------------ | ----------------- | ----------------- |
| [character\_set\_client](/docs/server/server-management/variables-and-modes/server-system-variables.md#character_set_client) | utf8 | utf8mb3 |
| [character\_set\_connection](/docs/server/server-management/variables-and-modes/server-system-variables.md#character_set_connection) | utf8 | utf8mb3 |
| [character\_set\_results](/docs/server/server-management/variables-and-modes/server-system-variables.md#character_set_results) | utf8 | utf8mb3 |
| [character\_set\_system](/docs/server/server-management/variables-and-modes/server-system-variables.md#character_set_system) | utf8 | utf8mb3 |
| [innodb\_flush\_method](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_flush_method) | fsync | O\_DIRECT |
| [old\_mode](/docs/server/server-management/variables-and-modes/server-system-variables.md#old_mode) | Empty | UTF8\_IS\_UTF8MB3 |
#### Options That Have Been Removed or Renamed
The following options should be removed or renamed if you use them in your [option files](/docs/server/server-management/install-and-upgrade-mariadb/configuring-mariadb/configuring-mariadb-with-option-files.md):
| Option | Reason |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [innodb\_adaptive\_max\_sleep\_delay](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_adaptive_max_sleep_delay) | |
| [innodb\_background\_scrub\_data\_check\_interval](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_background_scrub_data_check_interval) | |
| [innodb\_background\_scrub\_data\_compressed](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_background_scrub_data_compressed) | |
| [innodb\_background\_scrub\_data\_interval](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_background_scrub_data_interval) | |
| [innodb\_background\_scrub\_data\_uncompressed](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_background_scrub_data_uncompressed) | |
| [innodb\_buffer\_pool\_instances](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_buffer_pool_instances) | |
| [innodb\_checksum\_algorithm](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_checksum_algorithm) | The variable is still present, but the \*innodb and \*none options have been removed as the crc32 algorithm only is supported from [MariaDB 10.6](/docs/release-notes/community-server/10.6/what-is-mariadb-106.md). |
| [innodb\_commit\_concurrency](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_commit_concurrency) | |
| [innodb\_concurrency\_tickets](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_concurrency_tickets) | |
| [innodb\_file\_format](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_file_format) | |
| [innodb\_large\_prefix](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_large_prefix) | |
| [innodb\_lock\_schedule\_algorithm](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_lock_schedule_algorithm) | |
| [innodb\_log\_checksums](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_log_checksums) | |
| [innodb\_log\_compressed\_pages](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_log_compressed_pages) | |
| [innodb\_log\_files\_in\_group](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_log_files_in_group) | |
| [innodb\_log\_optimize\_ddl](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_log_optimize_ddl) | |
| [innodb\_page\_cleaners](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_page_cleaners) | |
| [innodb\_replication\_delay](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_replication_delay) | |
| [innodb\_scrub\_log](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_scrub_log) | |
| [innodb\_scrub\_log\_speed](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_scrub_log_speed) | |
| [innodb\_sync\_array\_size](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_sync_array_size) | |
| [innodb\_thread\_concurrency](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_thread_concurrency) | |
| [innodb\_thread\_sleep\_delay](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_thread_sleep_delay) | |
| [innodb\_undo\_logs](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_undo_logs) | |
#### 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 |
| -------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------- |
| [wsrep\_replicate\_myisam](/docs/galera-cluster/reference/galera-cluster-system-variables.md#wsrep_replicate_myisam) | Use [wsrep\_mode](/docs/galera-cluster/reference/galera-cluster-system-variables.md#wsrep_mode) instead. |
| [wsrep\_strict\_ddl](/docs/galera-cluster/reference/galera-cluster-system-variables.md#wsrep_strict_ddl) | Use [wsrep\_mode](/docs/galera-cluster/reference/galera-cluster-system-variables.md#wsrep_mode) instead. |
### Major New Features To Consider
* See also [System Variables Added in MariaDB 10.6](/docs/server/ha-and-performance/optimization-and-tuning/system-variables/system-and-status-variables-added-by-major-release/system-variables-added-in-mariadb-10-6.md).
### See Also
* [Features in MariaDB 10.6](/docs/release-notes/community-server/10.6/what-is-mariadb-106.md)
* [Upgrading from MariaDB 10.5 to MariaDB 10.6 with Galera Cluster](/docs/galera-cluster/galera-management/upgrading-galera-cluster/upgrading-from-mariadb-10-5-to-mariadb-10-6-with-galera-cluster.md)
* [Upgrading from MariaDB 10.4 to MariaDB 10.5](/docs/server/server-management/install-and-upgrade-mariadb/upgrading/mariadb-community-server-upgrade-paths/upgrading-to-unmaintained-mariadb-releases/upgrading-from-mariadb-10-4-to-mariadb-10-5.md)
* [Upgrading from MariaDB 10.3 to MariaDB 10.4](/docs/server/server-management/install-and-upgrade-mariadb/upgrading/mariadb-community-server-upgrade-paths/upgrading-to-unmaintained-mariadb-releases/upgrading-from-mariadb-103-to-mariadb-104.md)
* [Upgrading from MariaDB 10.2 to MariaDB 10.3](/docs/server/server-management/install-and-upgrade-mariadb/upgrading/mariadb-community-server-upgrade-paths/upgrading-to-unmaintained-mariadb-releases/upgrading-from-mariadb-102-to-mariadb-103.md)
*This page is licensed: CC BY-SA / Gnu FDL*
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