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How do you reduce lag in replication?
To avoid replica lag, run your transactions in smaller batches and run commits more frequently.
What causes replication lag?
Long-running transactions in the primary database If a large number of rows are updated in a single transaction, it can cause a sudden spike in the number of changes that need to be applied to the primary instance and then sent to the replica.
How do I troubleshoot MySQL replication issues?
4.4 Troubleshooting Replication
- Verify that the source has binary logging enabled by issuing a SHOW MASTER STATUS statement.
- Verify that the server_id system variable was set at startup on both the source and replica and that the ID value is unique on each server.
- Verify that the replica is running.
What is replication latency?
Replication latency is the amount of time it takes for a transaction that occurs in the primary database to be applied to the replicate database. The time includes Replication Agent processing, Replication Server processing, and network usage.
How can replication be improved?
One way to improve the performance of the replication process is to create a deeper replication structure that enables the source to replicate to only one replica, and for the remaining replicas to connect to this primary replica for their individual replication requirements.
How can SQL server improve replication performance?
Server and Network
- Set the minimum and maximum amount of memory allocated to Microsoft SQL Server Database Engine.
- Ensure proper allocation of database data files and log files.
- Consider adding memory to servers used in replication, particularly the Distributor.
- Use multiprocessor computers.
- Use a fast network.
How we can resolve replication errors?
To fix the replication error we follow the below steps.
- First, we log into the MYSQL.
- On the MySQL shell, we check the slave status.
- For that, we stop the slave from replication, using the below command.
- Next, we tell the slave to simply skip the invalid SQL query.
- Again, we start the slave.
How do you check MySQL replication is working?
Check MySQL Replication Status on Query Servers
- Start the MySQL command-line utility on the slave server: # cd /opt/mysql/mysql/bin.
- Check the replication status using the show slave status command (the status of the slave server is conveyed by the Slave_IO_Running and Slave_SQL_Running column values):
How do I fix MySQL replication error?
Solution 1
- First, we log into the MYSQL. mysql -u root -p.
- On the MySQL shell, we check the slave status.
- For that, we stop the slave from replication, using the below command.
- Next, we tell the slave to simply skip the invalid SQL query.
- Again, we start the slave.
- After that, we check if replication is working again.