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This parameter defines the logical cluster name for the node. SHOW VARIABLES LIKE 'wsrep_cluster_address' +-+-+ | Variable_name | Value | +-+-+ | wsrep_cluster_address | gcomm : // 192. You can execute the following SHOW VARIABLES statement with a LIKE operator to see how this variable is set: However, as a rule don’t use tables without primary keys. This parameter tells the node that when it encounters a row without a primary key, it should create one for replication purposes. The node uses the primary key in replication to allow for the parallel applying of transactions to a table. Galera Cluster requires primary keys on all tables. This parameter is used to define whether the node should generate primary keys on rows without them for the purposes of certification. SHOW VARIABLES LIKE 'wsrep_certification_rules' +-+-+ | Variable_name | Value | +-+-+ | wsrep_certification_rules | STRICT | +-+-+ You can execute the following SHOW VARIABLES statement to see how this variable is set: It significantly reduces the rate of certification conflicts for INSERT statements.

This is done to reduce the likelihood that two nodes will attempt to write the same auto-increment value to a table. The wsrep_auto_increment_control parameter enables additional calculations to this process, using the number of nodes connected to the Primary Component to adjust the increment and offset.

The second relates to the offset it should use in moving to the next position. The first relates to the value auto-increment rows count from the offset. The node manages auto-increment values in a table using two variables: auto_increment_increment and auto_increment_offset. This parameter enables the automatic adjustment of auto increment system variables with changes in cluster membership. SHOW VARIABLES LIKE 'innodb-wsrep-applier-lock-wait-timeout' +-+-+ | Variable_name | Value | +-+-+ | innodb - wsrep - applier - lock - wait - timeout | 10 | +-+-+ You can execute the SHOW VARIABLES statement with the LIKE operator as shown below to get list of all Galera related variables on your server: Table, your web browser will scroll down to the entry for it with more details

If you click on a particular variable in this Was the first one to use consistent versioning scheme as was chosen asĪlmost all of the variables are global except for a few. Although there were earlier versions of MySQL-wsrep, this These are MySQL system variables starting from wsrep API patch version 21.1įor MySQL 5.1.58.

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