What is the cause of the delay in MySQL master-slave replication?
There could be various reasons for MySQL master-slave replication delay, here are some possible causes:
- Network latency refers to the slow or unstable network connection speed between the master and slave servers, causing a delay in data synchronization.
- If the main server’s load is too high, it may result in delays in data synchronization. The load of the main server can be checked using monitoring tools such as top or htop.
- Repeated queries and long-running transactions: If there are a large number of repeated queries or transactions running for a long time on the secondary server, it may result in delays in data synchronization due to the secondary server being unable to handle update requests from the primary server in a timely manner.
- Inappropriate database configuration: If the server’s configuration is not appropriate, such as setting a small buffer area or improper index settings, it could result in delays in data synchronization.
- Slow queries on the secondary server may cause delays in data synchronization if the server cannot process update requests from the primary server in a timely manner.
- Large amount of data: If there is a significant amount of data on the main server, it may cause delays in data synchronization. The time needed for data replication will be longer during initial synchronization or when a large amount of data is being updated.
- If the versions of MySQL on the master and slave servers do not match, it may cause delays in data synchronization. Make sure that the same version of MySQL is running on both the master and slave servers.
These reasons could all potentially cause delays in MySQL master-slave synchronization, specific reasons need to be identified and optimized based on the actual situation.
