SHOW SLAVE STATUS
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Syntax
SHOW SLAVE ["connection_name"] STATUS
or
SHOW ALL SLAVES STATUS
Description
This statement provides status information on essential parameters of the replication slave threads.
This statement requires the SUPER or the REPLICATION_CLIENT privilege.
Multi-source
MariaDB 10.0 introduced the FULL and "connection_name" options to
allow you to connect to many masters at the same time.
ALL SLAVES gives you a list of all connections to the master.
The rows will be sorted according to Connection_name.
If you specify a connection_name, you only get the information about that
connection. If connection_name is not used, then the name set by default_master_connection is used. If the connection name doesn't exist you will get an error:
There is no master connection for 'xxx'.
Column descriptions
| Name | Description | Added |
|---|---|---|
| Connection_name | Name of the master connection. Returned with SHOW ALL SLAVES STATUS only. | MariaDB 10.0 |
| Slave_SQL_State | State of SQL thread. Returned with SHOW ALL SLAVES STATUS only. | MariaDB 10.0 |
| Master_host | Master host that the slave is connected to. | |
| Master_user | Account user name being used to connect to the master. | |
| Master_port | The port being used to connect to the master. | |
| Connect_Retry | Time in seconds between retries to connect. The default is 60. The CHANGE MASTER TO statement can set this. The master_retry_count system variable determines the maximum number of reconnection attempts. | |
| Master_Log_File | Name of the master binary log file that the I/O thread is currently reading from. | |
| Read_Master_Log_Pos | Position up to which the I/O thread has read in the current master binary log file. | |
| Relay_Log_File | Name of the relay log file that the SQL thread is currently processing. | |
| Relay_Log_Pos | Position up to which the SQL thread has finished processing in the current relay log file. | |
| Relay_Master_Log_File | Name of the master binary log file that contains the most recent event executed by the SQL thread. | |
| Slave_IO_Running | Whether the slave I/O thread is running and connected (Yes), running but not connected to a master (Connecting) or not running (No). | |
| Slave_SQL_Running | Whether or not the SQL thread is running. | |
| Replicate_Do_DB | Databases specified for replicating with the replicate_do_db option. | |
| Replicate_Ignore_DB | Databases specified for ignoring with the replicate_ignore_db option. | |
| Replicate_Do_Table | Tables specified for replicating with the replicate_do_table option. | |
| Replicate_Ignore_Table | Tables specified for ignoring with the replicate_ignore_table option. | |
| Replicate_Wild_Do_Table | Tables specified for replicating with the replicate_wild_do_table option. | |
| Replicate_Wild_Ignore_Table | Tables specified for ignoring with the replicate_wild_ignore_table option. | |
| Last_Errno | Alias for Last_SQL_Errno (see below) | |
| Last Error | Alias for Last_SQL_Error (see below) | |
| Skip_Counter | Number of events that a slave skips from the master, as recorded in the sql_slave_skip_counter system variable. | |
| Exec_Master_Log_Pos | Position up to which the SQL thread has processed in the current master binary log file. Can be used to start a new slave from a current slave with the CHANGE MASTER TO ... MASTER_LOG_POS option. | |
| Relay_Log_Space | Total size of all relay log files combined. | |
| Until_Condition | ||
| Until_Log_File | The MASTER_LOG_FILE value of the START SLAVE UNTIL condition. | |
| Until_Log_Pos | The MASTER_LOG_POS value of the START SLAVE UNTIL condition. | |
| Master_SSL_Allowed | Whether an SSL connection is permitted (Yes), not permitted (No) or permitted but without the slave having SSL support enabled (Ignored) | |
| Master_SSL_CA_File | The MASTER_SSL_CA option of the CHANGE MASTER TO statement. | |
| Master_SSL_CA_Path | The MASTER_SSL_CAPATH option of the CHANGE MASTER TO statement. | |
| Master_SSL_Cert | The MASTER_SSL_CERT option of the CHANGE MASTER TO statement. | |
| Master_SSL_Cipher | The MASTER_SSL_CIPHER option of the CHANGE MASTER TO statement. | |
| Master_SSL_Key | The MASTER_SSL_KEY option of the CHANGE MASTER TO statement. | |
| Seconds_Behind_Master | Difference between the timestamp logged on the master for the event that the slave is currently processing, and the current timestamp on the slave. Zero if the slave is not currently processing an event. From MariaDB 10.0.23 and MariaDB 10.1.9, with parallel replication, seconds_behind_master is updated only after transactions commit. | |
| Master_SSL_Verify_Server_Cert | The MASTER_SSL_VERIFY_SERVER_CERT option of the CHANGE MASTER TO statement. | |
| Last_IO_Errno | Error code of the most recent error that caused the I/O thread to stop (also recorded in the slave's error log). 0 means no error. RESET SLAVE or RESET MASTER will reset this value. | |
| Last_IO_Error | Error message of the most recent error that caused the I/O thread to stop (also recorded in the slave's error log). An empty string means no error. RESET SLAVE or RESET MASTER will reset this value. | |
| Last_SQL_Errno | Error code of the most recent error that caused the SQL thread to stop (also recorded in the slave's error log). 0 means no error. RESET SLAVE or RESET MASTER will reset this value. | |
| Last_SQL_Error | Error message of the most recent error that caused the SQL thread to stop (also recorded in the slave's error log). An empty string means no error. RESET SLAVE or RESET MASTER will reset this value. | |
| Replicate_Ignore_Server_Ids | List of server_ids that are currently being ignored for replication purposes, or an empty string for none, as specified in the IGNORE_SERVER_IDS option of the CHANGE MASTER TO statement. | |
| Master_Server_Id | The master's server_id value. | |
| Master_SSL_Crl | The MASTER_SSL_CRL option of the CHANGE MASTER TO statement. | MariaDB 10.0 |
| Master_SSL_Crlpath | The MASTER_SSL_CRLPATH option of the CHANGE MASTER TO statement. | MariaDB 10.0 |
| Using_Gtid | Whether or not global transaction ID's are being used for replication (either No or Slave_Pos). | MariaDB 10.0.2 |
| Gtid_IO_Pos | Current global transaction ID value. | MariaDB 10.0.2 |
| Retried_transactions | Number of retried transactions for this connection. Returned with SHOW ALL SLAVES STATUS only. | MariaDB 10.0 |
| Max_relay_log_size | Max relay log size for this connection. Returned with SHOW ALL SLAVES STATUS only. | MariaDB 10.0 |
| Executed_log_entries | How many log entries the slave has executed. Returned with SHOW ALL SLAVES STATUS only. | MariaDB 10.0 |
| Slave_received_heartbeats | How many heartbeats we have got from the master. Returned with SHOW ALL SLAVES STATUS only. | MariaDB 10.0 |
| Slave_heartbeat_period | How often to request a heartbeat packet from the master (in seconds). Returned with SHOW ALL SLAVES STATUS only. | MariaDB 10.0 |
| Gtid_Slave_Pos | GTID of the last event group replicated on a slave server, for each replication domain, as stored in the gtid_slave_pos system variable. Returned with SHOW ALL SLAVES STATUS only. | MariaDB 10.0 |
| SQL_Delay | Value specified by MASTER_DELAY in CHANGE MASTER (or 0 if none). | MariaDB 10.2.3 |
| SQL_Remaining_Delay | When the slave is delaying the execution of an event due to MASTER_DELAY, this is the number of seconds of delay remaining before the event will be applied. Otherwise, the value is NULL. | MariaDB 10.2.3 |
| Slave_SQL_Running_State | The state of the SQL driver threads, same as in SHOW PROCESSLIST. When the slave is delaying the execution of an event due to MASTER_DELAY, this field displays: "Waiting until MASTER_DELAY seconds after master executed event". | MariaDB 10.2.3 |
Examples
If you issue this statement using the mysql client,
you can use a \G
SHOW SLAVE STATUS\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: db01.example.com
Master_User: replicant
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mariadb-bin.000010
Read_Master_Log_Pos: 548
Relay_Log_File: relay-bin.000004
Relay_Log_Pos: 837
Relay_Master_Log_File: mariadb-bin.000010
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 548
Relay_Log_Space: 1497
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 101
Master_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
MariaDB [(none)]> SHOW ALL SLAVES STATUS\G
*************************** 1. row ***************************
Connection_name:
Slave_SQL_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Slave_IO_State: Waiting for master to send event
Master_Host: db01.example.com
Master_User: replicant
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mariadb-bin.000010
Read_Master_Log_Pos: 3608
Relay_Log_File: relay-bin.000004
Relay_Log_Pos: 3897
Relay_Master_Log_File: mariadb-bin.000010
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 3608
Relay_Log_Space: 4557
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 101
Master_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: No
Gtid_IO_Pos:
Retried_transactions: 0
Max_relay_log_size: 104857600
Executed_log_entries: 40
Slave_received_heartbeats: 11
Slave_heartbeat_period: 1800.000
Gtid_Slave_Pos: 0-101-2320
You can also access some of the variables directly from status variables:
SET @@default_master_connection="test" ; show status like "%slave%" Variable_name Value Com_show_slave_hosts 0 Com_show_slave_status 0 Com_start_all_slaves 0 Com_start_slave 0 Com_stop_all_slaves 0 Com_stop_slave 0 Rpl_semi_sync_slave_status OFF Slave_connections 0 Slave_heartbeat_period 1800.000 Slave_open_temp_tables 0 Slave_received_heartbeats 0 Slave_retried_transactions 0 Slave_running OFF Slaves_connected 0 Slaves_running 1
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