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Why is MySQL slave not replicating anything?
The Master is an active server with many updates and deletes running, but the slave will just not replicate anything. There are no errors in the log and the slave is reading binary logs fine from the master, but it does nothing on the slave.
Why is MySQL slave stuck at system lock most of the time?
There are no errors in the log and the slave is reading binary logs fine from the master, but it does nothing on the slave. The Seconds_Behind_Master value keeps increasing. This is what show processlist on slave shows: The only sign of life is that Relay_Log_Pos from the slave status is changing values but very slowly.
What to look for if your MySQL Replication is lagging?
However, this always comes to a price especially when bad queries (such as lack of primary or unique keys) are replicated or some trouble with the hardware (such as network or disk IO issues). When these issues occur, the most common problem to face is the replication lag.
What does system lock mean in MySQL profiling?
Load file can generally cause this issue. I had answered a question back in January 2013 concerning the thread state “System Lock” : What does ‘system lock’ mean in mysql profiling a LOAD DATA INFILE statement? The thread is going to request or is waiting for an internal or external system lock for the table.
How to run replication monitor in SQL Server?
The Distribution Agent finds data in the distribution database and then applies it to the subscriber. Connect to the publisher in SQL Server Management Studio. Expand the server node, right-click the Replication folder, and then select Launch Replication Monitor.
How to find errors with transactional replication in SQL Server?
This view shows you two agents, the Snapshot Agent and the Log Reader Agent. The one that’s encountering an error has the red X. In this case, it’s the Log Reader Agent. Double-click the line that’s reporting the error to open the agent history for the Log Reader Agent.
Why is MySQL slave running at system lock most of the time?
You have mentioned that Slave_SQL_Running_State is also getting change which means I/O thread is also working. What bad is :”relay log space is increasing” which means data is coming but taking time to execute. Are you observing slowness in Master as well ?