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SELECT * FROM performance_schema.replication_applier_status_by_worker
LIMIT 1;
SELECT * FROM performance_schema.replication_applier_status_by_worker
WHERE service_state='YES' OR last_error_message='ERROR';
INSERT INTO performance_schema.replication_applier_status_by_worker
SET service_state='YES', last_error_message='ERROR',
worker_id=1, thread_id=2, last_error_number=1234;
ERROR 42000: INSERT command denied to user 'root'@'localhost' for table `performance_schema`.`replication_applier_status_by_worker`
UPDATE performance_schema.replication_applier_status_by_worker
SET worker_id=12;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`replication_applier_status_by_worker`
UPDATE performance_schema.replication_applier_status_by_worker
SET worker_d=12 where service_state like "YES";
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table `performance_schema`.`replication_applier_status_by_worker`
DELETE FROM performance_schema.replication_applier_status_by_worker
WHERE worker_id=1;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`replication_applier_status_by_worker`
DELETE FROM performance_schema.replication_applier_status_by_worker;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table `performance_schema`.`replication_applier_status_by_worker`
LOCK TABLES performance_schema.replication_applier_status_by_worker READ;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`replication_applier_status_by_worker`
UNLOCK TABLES;
LOCK TABLES performance_schema.replication_applier_status_by_worker WRITE;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table `performance_schema`.`replication_applier_status_by_worker`
UNLOCK TABLES;
#
# MDEV-25325 column_comment for performance_schema tables
#
select column_name, column_comment
from information_schema.columns
where table_schema='performance_schema' and table_name='replication_applier_status_by_worker';
column_name column_comment
CHANNEL_NAME Name of replication channel through which the transaction is received.
THREAD_ID Thread_Id as displayed in the performance_schema.threads table for thread with name 'thread/sql/rpl_parallel'. THREAD_ID will be NULL when worker threads are stopped due to error/force stop.
SERVICE_STATE Whether or not the thread is running.
LAST_SEEN_TRANSACTION Last GTID executed by worker
LAST_ERROR_NUMBER Last Error that occurred on a particular worker.
LAST_ERROR_MESSAGE Last error specific message.
LAST_ERROR_TIMESTAMP Time stamp of last error.
WORKER_IDLE_TIME Total idle time in seconds that the worker thread has spent waiting for work from SQL thread.
LAST_TRANS_RETRY_COUNT Total number of retries attempted by last transaction.
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