Lan Yiyun: MySQL master-slave data is inconsistent, how to repair master-slave inconsistency, how to avoid master-slave inconsistency?

MySQL master-slave data inconsistency is a common database replication problem, which may be caused by network problems, configuration errors, or other factors. Methods to fix master-slave inconsistency usually involve the following steps:

Repair MySQL master-slave data inconsistency:

1. Check the master-slave replication status:
   First, use  SHOW SLAVE STATUS\Gthe command to check the master-slave replication status of the slave server. Pay attention to the following important information: Slave_IO_Runningand  Slave_SQL_Running, make sure both are  Yes, indicating that the replication thread is functioning properly.
2. Check the master and slave log locations:
   Check the Binlog file name and location of the master server ( SHOW MASTER STATUS), and the Relay Log file name and location of the slave server ( SHOW SLAVE STATUS). Compare whether the two are consistent and ensure that the replication process of the slave server is synchronized with the master server.
3. Resynchronize the slave server:
   If the master and slave are inconsistent, you can try to resynchronize the slave server. Stop the replication process of the slave server ( STOP SLAVE;), then use  CHANGE MASTER TOthe command to update the Binlog file name and location of the master server, and then use  START SLAVE;the command to restart the replication process.
4. Data comparison and repair:
   After resynchronization, compare the data consistency between the master and slave servers. You can use some data comparison tools, such as pt-table-checksum and pt-table-sync, to detect and repair data inconsistencies.

Avoid MySQL master-slave data inconsistency:

1. Ensure network stability:
   The network connection between the master and slave servers must be stable and reliable to avoid network interruption or delay during the replication process.
2. Regularly monitor the master-slave status:
   Regularly check the replication status of the master-slave server, and detect and handle replication problems in a timely manner by monitoring alarms and log records.
3. Use the correct replication configuration:
   Make sure to use the correct replication configuration, such as configuring the correct master-slave replication accounts, permissions, etc., to avoid replication problems caused by configuration errors.
4. Database version consistency:
   The MySQL versions of the master and slave servers should be consistent to avoid replication problems caused by version incompatibility.
5. Properly plan server resources:
   Ensure that the hardware resources of the master and slave servers are sufficient to avoid replication delays due to excessive server load.

Through the above method, the problem of MySQL master-slave data inconsistency can be repaired, and the occurrence of master-slave inconsistency can be avoided in daily operation and maintenance, ensuring the reliability and consistency of database replication.