MySQL 9.3 Reference Manual Including MySQL NDB Cluster 9.3
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 19.2.2, “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 BINARY LOGS AND
GTIDS or
RESET
REPLICA resets the values shown in these
columns.
LAST_ERROR_TIMESTAMP
A timestamp in '
format that shows when the most recent I/O error took
place.
YYYY-MM-DD
hh:mm:ss[.fraction]'
LAST_HEARTBEAT_TIMESTAMP
A timestamp in '
format that shows when the most recent heartbeat signal
was received by a replica.
YYYY-MM-DD
hh:mm:ss[.fraction]'
COUNT_RECEIVED_HEARTBEATS
The total number of heartbeat signals that a replica
received since the last time it was restarted or reset, or
a CHANGE REPLICATION SOURCE
TO statement was issued.
LAST_QUEUED_TRANSACTION
The global transaction ID (GTID) of the last transaction that was queued to the relay log.
LAST_QUEUED_TRANSACTION_ORIGINAL_COMMIT_TIMESTAMP
A timestamp in '
format that shows when the last transaction queued in the
relay log was committed on the original source.
YYYY-MM-DD
hh:mm:ss[.fraction]'
LAST_QUEUED_TRANSACTION_IMMEDIATE_COMMIT_TIMESTAMP
A timestamp in '
format that shows when the last transaction queued in the
relay log was committed on the immediate source.
YYYY-MM-DD
hh:mm:ss[.fraction]'
LAST_QUEUED_TRANSACTION_START_QUEUE_TIMESTAMP
A timestamp in '
format that shows when the last transaction was placed in
the relay log queue by this I/O thread.
YYYY-MM-DD
hh:mm:ss[.fraction]'
LAST_QUEUED_TRANSACTION_END_QUEUE_TIMESTAMP
A timestamp in '
format that shows when the last transaction was queued to
the relay log files.
YYYY-MM-DD
hh:mm:ss[.fraction]'
QUEUEING_TRANSACTION
The global transaction ID (GTID) of the currently queueing transaction in the relay log.
QUEUEING_TRANSACTION_ORIGINAL_COMMIT_TIMESTAMP
A timestamp in '
format that shows when the currently queueing transaction
was committed on the original source.
YYYY-MM-DD
hh:mm:ss[.fraction]'
QUEUEING_TRANSACTION_IMMEDIATE_COMMIT_TIMESTAMP
A timestamp in '
format that shows when the currently queueing transaction
was committed on the immediate source.
YYYY-MM-DD
hh:mm:ss[.fraction]'
QUEUEING_TRANSACTION_START_QUEUE_TIMESTAMP
A timestamp in '
format that shows when the first event of the currently
queueing transaction was written to the relay log by this
I/O thread.
YYYY-MM-DD
hh:mm:ss[.fraction]'
When the Performance Schema is disabled, local timing information is not collected, so the fields showing the start and end timestamps for queued transactions are zero.
The replication_connection_status
table has these indexes:
Primary key on (CHANNEL_NAME)
Index on (THREAD_ID)
The following table shows the correspondence between
replication_connection_status
columns and
SHOW
REPLICA STATUS columns.
replication_connection_status Column |
SHOW REPLICA STATUS Column |
|---|---|
SOURCE_UUID |
Master_UUID |
THREAD_ID |
None |
SERVICE_STATE |
Replica_IO_Running |
RECEIVED_TRANSACTION_SET |
Retrieved_Gtid_Set |
LAST_ERROR_NUMBER |
Last_IO_Errno |
LAST_ERROR_MESSAGE |
Last_IO_Error |
LAST_ERROR_TIMESTAMP |
Last_IO_Error_Timestamp |