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Showing content from https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/mysql_rds_replica_status.html below:

mysql.rds_replica_status - Amazon Relational Database Service

Shows the replication status of a MariaDB read replica.

Call this procedure on the read replica to show status information on essential parameters of the replica threads.

CALL mysql.rds_replica_status;

This procedure is only supported for MariaDB DB instances running MariaDB version 10.5 and higher.

This procedure is the equivalent of the SHOW REPLICA STATUS command. This command isn't supported for MariaDB version 10.5 and higher DB instances.

In prior versions of MariaDB, the equivalent SHOW SLAVE STATUS command required the REPLICATION SLAVE privilege. In MariaDB version 10.5 and higher, it requires the REPLICATION REPLICA ADMIN privilege. To protect the RDS management of MariaDB 10.5 and higher DB instances, this new privilege isn't granted to the RDS master user.

The following example shows the status of a MariaDB read replica:

call mysql.rds_replica_status;

The response is similar to the following:

*************************** 1. row ***************************
                Replica_IO_State: Waiting for master to send event
                     Source_Host: XX.XX.XX.XXX
                     Source_User: rdsrepladmin
                     Source_Port: 3306
                   Connect_Retry: 60
                 Source_Log_File: mysql-bin-changelog.003988
             Read_Source_Log_Pos: 405
                  Relay_Log_File: relaylog.011024
                   Relay_Log_Pos: 657
           Relay_Source_Log_File: mysql-bin-changelog.003988
              Replica_IO_Running: Yes
             Replica_SQL_Running: Yes
                 Replicate_Do_DB:
             Replicate_Ignore_DB:
              Replicate_Do_Table:
          Replicate_Ignore_Table: mysql.rds_sysinfo,mysql.rds_history,mysql.rds_replication_status
         Replicate_Wild_Do_Table:
     Replicate_Wild_Ignore_Table:
                      Last_Errno: 0
                      Last_Error:
                    Skip_Counter: 0
             Exec_Source_Log_Pos: 405
                 Relay_Log_Space: 1016
                 Until_Condition: None
                  Until_Log_File:
                   Until_Log_Pos: 0
              Source_SSL_Allowed: No
              Source_SSL_CA_File:
              Source_SSL_CA_Path:
                 Source_SSL_Cert:
               Source_SSL_Cipher:
                  Source_SSL_Key:
           Seconds_Behind_Master: 0
   Source_SSL_Verify_Server_Cert: No
                   Last_IO_Errno: 0
                   Last_IO_Error:
                  Last_SQL_Errno: 0
                  Last_SQL_Error:
     Replicate_Ignore_Server_Ids:
                Source_Server_Id: 807509301
                  Source_SSL_Crl:
              Source_SSL_Crlpath:
                      Using_Gtid: Slave_Pos
                     Gtid_IO_Pos: 0-807509301-3980
         Replicate_Do_Domain_Ids:
     Replicate_Ignore_Domain_Ids:
                   Parallel_Mode: optimistic
                       SQL_Delay: 0
             SQL_Remaining_Delay: NULL
       Replica_SQL_Running_State: Reading event from the relay log
              Replica_DDL_Groups: 15
Replica_Non_Transactional_Groups: 0
    Replica_Transactional_Groups: 3658
1 row in set (0.000 sec)

Query OK, 0 rows affected (0.000 sec)

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