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MariaDB Options

These are MariaDB Server and Enterprise options. If you click on a particular variable in this table, your web browser will scroll down to the entry for it with more details and an explanation.

MariaDB Server Options


Option
Default Value
Global
Dynamic		 Initial
Version		 Version
Deprecated
wsrep_gtid_domain_id 0 Yes Yes    
wsrep_gtid_mode OFF Yes Yes    
wsrep_gtid_seq_no   No Yes    
wsrep-mysql-replication-bundle 0 Yes No    
wsrep_patch_version   Yes No    
wsrep_mode=REPLICATE_ARIA OFF Yes      
wsrep_mode=REPLICATE_MYISAM OFF Yes      

wsrep_gtid_domain_id

This system variable defines the GTID domain ID that is used for wsrep GTID mode.

  • When wsrep_gtid_mode is set to ON, wsrep_gtid_domain_id is used in place of gtid_domain_id for all Galera Cluster write sets.
  • When wsrep_gtid_mode is set to OFF, wsrep_gtid_domain_id is simply ignored to allow for backward compatibility.
  • There are some additional requirements that need to be met in order for this mode to generate consistent GTIDs. For more information, see Using MariaDB GTIDs with MariaDB Galera Cluster.
Command-line Format --wsrep-gtid-domain-id=#
System Variable wsrep_gtid_domain_id
Variable Scope Global
Dynamic Variable Yes
Data Type Numeric
Default Value 0
Range 0 to 4294967295
MariaDB Version Version 10.1.4

wsrep_gtid_mode

Wsrep GTID mode attempts to keep GTIDs consistent for Galera Cluster write sets on all cluster nodes. GTID state is initially copied to a joiner node during an SST. If you are planning to use Galera Cluster with MariaDB replication, then wsrep GTID mode can be helpful.

Command-line Format --wsrep-gtid-mode[={0|1}]
System Variable wsrep_gtid_mode
Variable Scope Global
Dynamic Variable Yes
Data Type Boolean
Default Value OFF
MariaDB Version Version 10.1.4

wsrep_gtid_seq_no

Internal server usage, manually set WSREP GTID seqno.

Command-line Format None
System Variable Internal server usage, manually set WSREP GTID seqno.
Variable Scope Session only
Dynamic Variable Yes
Data Type Numeric
Range 0 to 18446744073709551615
MariaDB Version Version 10.5.1

wsrep-mysql-replication-bundle

Defines the number of replication events that are grouped together. This is an experimental implementation aimed to assist with bottlenecks when a single replica faces a large commit time delay. If set to 0 (the default), there is no grouping.

Command-line Format --wsrep-mysql-replication-bundle=#
System Variable wsrep-mysql-replication-bundle
Variable Scope Global
Dynamic Variable No
Data Type Numeric
Default Value 0
Range 0 to 1000

wsrep_patch_version

Wsrep patch version, for example wsrep_25.10.

Command-line Format None
System Variable wsrep_patch_version
Variable Scope Global
Dynamic Variable No
Data Type String
Default Value None
MariaDB Version Version 10.1.5

wsrep_mode=REPLICATE_ARIA

Note

This functionality is experimental and should not be relied upon in production systems.

Together with wsrep_mode=REPLICATE_MYISAM, this parameter enables Galera to replicate both DDL and DML for ARIA and/or MyISAM using TOI.

For example:

SET GLOBAL wsrep_mode = "REQUIRED_PRIMARY_KEY,REPLICATE_MYISAM,REPLICATE_ARIA";

Replicates both Aria and MyISAM DML, but requires a primary key for replicated table.

Command-line Format --wsrep_mode_replicate_aria
System Variable wsrep_mode_replicate_aria
Variable Scope Global
Dynamic Variable  
Permitted Values Boolean
Default Value OFF
Initial Version Version 1.0
MariaDB Version Version 10.6

You can execute the following SHOW VARIABLES statement to see how its set:

SHOW VARIABLES LIKE 'wsrep_mode_replicate_aria';

 +------------------------------+-------+
 | Variable_name                | Value |
 +------------------------------+-------+
 | wsrep_mode_replicate_aria    | ON    |
 +------------------------------+-------+

wsrep_mode=REPLICATE_MYISAM

Note

This functionality is experimental and should not be relied upon in production systems.

Together with wsrep_mode=REPLICATE_ARIA, this parameter enables Galera to replicate both DDL and DML for MyISAM and/or Aria using TOI.

For example:

SET GLOBAL wsrep_mode = "REQUIRED_PRIMARY_KEY,REPLICATE_MYISAM,REPLICATE_ARIA";

Replicates both MyISAM and Aria DML, but requires a primary key for replicated table.

Command-line Format --wsrep_mode_replicate_myisam
System Variable wsrep_mode_replicate_myisam
Variable Scope Global
Dynamic Variable  
Permitted Values Boolean
Default Value OFF
Initial Version Version 1.0
MariaDB Version Version 10.6

You can execute the following SHOW VARIABLES statement to see how its set:

SHOW VARIABLES LIKE 'wsrep_mode_replicate_myisam';

 +------------------------------+-------+
 | Variable_name                | Value |
 +------------------------------+-------+
 | wsrep_mode_replicate_myisam  | ON    |
 +------------------------------+-------+

MariaDB Enterprise Options


Option
Default Value
Global
Dynamic		 Initial
Version		 Version
Deprecated
wsrep-OSU-mode TOI Global and Session Yes 1.0  
wsrep_strict_ddl OFF Yes Yes 1.0  

wsrep-osu-mode

This parameter defines the mode for Online Schema Upgrade that the node uses to replicate DDL statements. The following methods are available:

DDL statements are non-transactional and as such don’t replicate through write-sets. There are two methods available that determine how the node handles replicating these statements:

  • TOI In the Total Order Isolation method, the cluster runs the DDL statement on all nodes in the same total order sequence, blocking other transactions from committing while the DDL is in progress.
  • RSU In the Rolling Schema Upgrade method, the node runs the DDL statements locally, thus blocking only the one node where the statement was made. While processing the DDL statement, the node is not replicating and may be unable to process replication events due to a table lock. Once the DDL operation is complete, the node catches up and syncs with the cluster to become fully operational again. The DDL statement or its effects are not replicated; the user is responsible for manually executing this statement on each node in the cluster.
  • NBO When the Non Blocking Option is used, DDL statements are processed in three phases:
    1. MDL lock requests for the operation are replicated first
    2. DDL statements are executed, with MDL protection
    3. Finally, the MDL lock release requests are replicated

For more information on DDL statements and OSU methods, see Schema Upgrades.

Command-line Format --wsrep-osu-mode
System Variable wsrep-osu-mode
Variable Scope Global and Session
Dynamic Variable Yes
Permitted Values (TOI | RSU | NBO)
Default Value TOI
Initial Version Version 1.0
MariaDB Version Version 10.5
MariaDB Enterprise Server (for NBO) Version 10.5

You can execute the following SHOW VARIABLES statement to see how its set:

SHOW VARIABLES LIKE 'Parameters; wsrep-osu-mode';

 +------------------------------+-------+
 | Variable_name                | Value |
 +------------------------------+-------+
 | Parameters; wsrep-osu-mode   | TOI   |
 +------------------------------+-------+

wsrep_strict_ddl

If set, rejects DDL on affected tables not supporting Galera replication.

Command-line Format --wsrep_strict_ddl
System Variable wsrep_strict_ddl
Variable Scope Global
Dynamic Variable Yes
Permitted Values Boolean (OFF, ON)
Default Value OFF
Initial Version Version 1.0
MariaDB Version Version 10.5

You can execute the following SHOW VARIABLES statement to see how its set:

SHOW VARIABLES LIKE 'Parameters; wsrep_strict_ddl';

 +------------------------------+-------+
 | Variable_name                | Value |
 +------------------------------+-------+
 | Parameters; wsrep_strict_ddl | OFF   |
 +------------------------------+-------+