Replication and Binary Log Status Variables

The following status variables are useful in binary logging and replication. See Server Status Variables for a complete list of status variables that can be viewed with SHOW STATUS.

See also the Full list of MariaDB options, system and status variables.

Binlog_bytes_written

• Description: The number of bytes written to the binary log.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.3

Binlog_cache_disk_use

• Description: Number of transactions which used a temporary disk cache because they could not fit in the regular binary log cache, being larger than binlog_cache_size.
• Scope: Global
• Data Type: numeric

Binlog_cache_use

• Description: Number of transaction which used the regular binary log cache, being smaller than binlog_cache_size.
• Scope: Global
• Data Type: numeric

Binlog_commits

• Description: Total number of transactions committed to the binary log.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.3

Binlog_group_commit_trigger_count

• Description: Total number of group commits triggered because of the number of binary log commits in the group reached the limit set by the variable binlog_commit_wait_count. See Group commit for the binary log.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.1.5, MariaDB 10.0.18

Binlog_group_commit_trigger_lock_wait

• Description: Total number of group commits triggered because a binary log commit was being delayed because of a lock wait where the lock was held by a prior binary log commit. When this happens the later binary log commit is placed in the next group commit. See Group commit for the binary log.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.1.5, MariaDB 10.0.18

Binlog_group_commit_trigger_timeout

• Description: Total number of group commits triggered because of the time since the first binary log commit reached the limit set by the variable binlog_commit_wait_usec. See Group commit for the binary log.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.1.5, MariaDB 10.0.18

Binlog_group_commits

• Description: Total number of group commits done to the binary log. See Group commit for the binary log.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.3

Binlog_snapshot_file

• Description: The binary log file. Unlike SHOW MASTER STATUS, can be queried in a transactionally consistent way, irrespective of which other transactions have been committed since the snapshot was taken. See Enhancements for START TRANSACTION WITH CONSISTENT SNAPSHOT.
• Scope: Global
• Data Type: string
• Introduced: MariaDB 5.3

Binlog_snapshot_position

• Description: The binary log position. Unlike SHOW MASTER STATUS, can be queried in a transactionally consistent way, irrespective of which other transactions have been committed since the snapshot was taken. See Enhancements for START TRANSACTION WITH CONSISTENT SNAPSHOT.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.3

Binlog_stmt_cache_disk_use

• Description: Number of non-transaction statements which used a temporary disk cache because they could not fit in the regular binary log cache, being larger than binlog_stmt_cache_size.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

Binlog_stmt_cache_use

• Description: Number of non-transaction statement which used the regular binary log cache, being smaller than binlog_stmt_cache_size.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

Com_change_master

• Description: Number of CHANGE MASTER TO statements executed.
• Scope: Global, Session
• Data Type: numeric

Com_show_master_status

• Description: Number of SHOW MASTER STATUS commands executed. executed.
• Scope: Global, Session
• Data Type: numeric

Com_show_new_master

• Description:
• Scope: Global, Session
• Data Type: numeric
• Removed: MariaDB 5.5

Com_show_slave_hosts

• Description: Number of SHOW SLAVE HOSTS commands executed.
• Scope: Global, Session
• Data Type: numeric

Com_show_slave_status

• Description: Number of SHOW SLAVE STATUS commands executed.
• Scope: Global, Session
• Data Type: numeric

Com_slave_start

• Description: Number of START SLAVE commands executed. Removed in MariaDB 10.0, see Com_start_slave.
• Scope: Global, Session
• Data Type: numeric
• Removed: MariaDB 10.0

Com_slave_stop

• Description: Number of STOP SLAVE commands executed. Removed in MariaDB 10.0, see Com_stop_slave.
• Scope: Global, Session
• Data Type: numeric
• Removed: MariaDB 10.0

Com_start_all_slaves

• Description: Number of START ALL SLAVES commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

Com_start_slave

• Description: Number of START SLAVE commands executed. Replaces the old Com_slave_start.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

Com_stop_all_slaves

• Description: Number of STOP ALL SLAVES commands executed.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

Com_stop_slave

• Description: Number of STOP SLAVE commands executed. Replaces the old Com_slave_stop.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.0.0

Master_gtid_wait_count

• Description: Number of times MASTER_GTID_WAIT called.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.1.4

Master_gtid_wait_time

• Description: Total number of time spent in MASTER_GTID_WAIT.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.1.4

Master_gtid_wait_timeouts

• Description: Number of timeouts occurring in MASTER_GTID_WAIT.
• Scope: Global, Session
• Data Type: numeric
• Introduced: MariaDB 10.1.4

Rpl_status

• Description: For showing the status of fail-safe replication. Removed in MySQL 5.6, still present in MariaDB 10.0.

Rpl_transactions_multi_engine

• Description: Number of replicated transactions that involved changes in multiple (transactional) storage engines, before considering the update of mysql.gtid_slave_pos. These are transactions that were already cross-engine, independent of the GTID position update introduced by replication.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.3.1

Slave_connections

• Description:
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.1.11

Slave_heartbeat_period

• Description: Time in seconds that a heartbeat packet is requested from the master by a slave.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

Slave_open_temp_tables

• Description: Number of temporary tables the slave has open.
• Scope: Global
• Data Type: numeric

Slave_received_heartbeats

• Description: Number of heartbeats the slave has received from the master.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 5.5

Slave_retried_transactions

• Description: Number of times the slave has retried transactions since the server started.
• Scope: Global
• Data Type: numeric

Slave_running

• Description: Whether the slave is running (both I/O and SQL threads running) or not.
• Scope: Global
• Data Type: numeric

Slave_skipped_errors

• Description: The number of times a slave has skipped errors defined by slave-skip-errors.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.0.18

Slaves_connected

• Description: Number of slaves connected.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.1.11

Slaves_running

• Description: Number of slave SQL threads running.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.1.11

Transactions_gtid_foreign_engine

• Description: Number of replicated transactions where the update of the gtid_slave_pos table had to choose a storage engine that did not otherwise participate in the transaction. This can indicate that setting gtid_pos_auto_engines might be useful.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.3.1

Transactions_multi_engine

• Description: Number of transactions that changed data in multiple (transactional) storage engines. If this is significantly larger than Rpl_transactions_multi_engine, it indicates that setting gtid_pos_auto_engines could reduce the need for cross-engine transactions.
• Scope: Global
• Data Type: numeric
• Introduced: MariaDB 10.3.1