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## 27.12.11.2 The replication_connection_status Table 

This table shows the current status of the I/O thread that handles the replica’s connection to the source, information on the last transaction queued in the relay log, and information on the transaction currently being queued in the relay log. 

Compared to the replication_connection_configuration  table, replication_connection_status  changes more frequently. It contains values that change during the connection, whereas replication_connection_configuration  contains values which define how the replica connects to the source and that remain constant during the connection. 

The replication_connection_status  table has these columns: 

• CHANNEL_NAME 

The replication channel which this row is displaying. There is always a default replication channel, and more replication channels can be added. See Section 17.2.2, “Replication Channels”  for more information. 

• GROUP_NAME 

If this server is a member of a group, shows the name of the group the server belongs to. 

• SOURCE_UUID 

The server_uuid  value from the source. 

• THREAD_ID 

The I/O thread ID. 

• SERVICE_STATE 

ON  (thread exists and is active or idle), OFF  (thread no longer exists), or CONNECTING  (thread exists and is connecting to the source). 

• RECEIVED_TRANSACTION_SET 

The set of global transaction IDs (GTIDs) corresponding to all transactions received by this replica. Empty if GTIDs are not in use. See GTID Sets for more information. 

• LAST_ERROR_NUMBER , LAST_ERROR_MESSAGE 

The error number and error message of the most recent error that caused the I/O thread to stop. An error number of 0 and message of the empty string mean “no error.”  If the LAST_ERROR_MESSAGE  value is not empty, the error values also appear in the replica’s error log. 

Issuing RESET MASTER  or RESET REPLICA | SLAVE  resets the values shown in these columns. 

• LAST_ERROR_TIMESTAMP 

A timestamp in ’ YYYY-MM-DD hh:mm:ss [. fraction ]’  format that shows when the most recent I/O error took place. 

