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Home Database Mysql Tutorial Troubleshooting common replication errors in MySQL

Troubleshooting common replication errors in MySQL

Jul 10, 2025 pm 12:15 PM
mysql copy troubleshooting

Common MySQL replication errors include Error 1236, Error 1032, connection errors and Error 1062. 1. Error 1236 is because the read location of the slave library exceeds the scope of the binlog of the main library. The solution is to manually adjust the slave library to the latest binlog file and location; 2. Error 1032 is caused by inconsistency in master and slave data, and can be skipped transactions or tools to repair data consistency; 3. Connection errors are mostly caused by network problems, so you need to check access rights, firewalls and adjust connection parameters; 4. Error 1062 is a unique key conflict, you can view conflict statements and skip or set them uniformly to avoid human intervention. When encountering problems, you should check the log and status before processing.

Troubleshooting common replication errors in MySQL

MySQL replication is very common in actual use, but occasionally there are some problems. The most common mistakes actually have corresponding troubleshooting and solutions, and it is not complicated to deal with after understanding the causes.

Troubleshooting common replication errors in MySQL

1. Error 1236: The slave is trying to read beyond the end of the relay log

This error usually occurs after a master-slave switch or restart. Simply put, the binlog position attempted to read from the library exceeds the current binlog range of the main library.

Troubleshooting common replication errors in MySQL

Possible reasons:

  • After the main library is restarted, the binlog file is cleared or reset.
  • From the library's Exec_Master_Log_Pos points to a non-existent location.

Solution:

Troubleshooting common replication errors in MySQL
  • Log in to the slave library and execute SHOW SLAVE STATUS\G to view the specific error message.
  • If you are sure that the data in the main library is up to date, you can manually adjust the pointing of the slave library:
     STOP SLAVE;
    CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=4;
    START SLAVE;

    The file name and location should be filled in according to the current latest binlog of the main library.

2. Error 1032: Can't find record in 'table_name'

This error occurs when the slave library applies the event and cannot find the corresponding record, which is usually caused by inconsistent master-slave data.

Common scenarios:

  • A record was deleted on the main library, but this record no longer exists on the slave library (for example, the synchronization failed before).
  • Or the main library has an update operation, but the slave library does not have that data.

How to deal with it:

  • If the occasional small data is inconsistent, you can use SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1; to skip the current transaction.
  • A safer approach is to check master-slave consistency and use tools such as pt-table-checksum and pt-table-sync to fix it.

Note: Although it is convenient to skip transactions, if it occurs frequently, it means that there may be a greater risk of data consistency between master and slave.

3. Connection errors: Error 2003 / 2005 / 115 / timeout

This type of error is usually not a problem with MySQL itself, but a problem with network connection.

Typical manifestations:

  • The slave library cannot connect to the main library.
  • The copying process is interrupted, prompting that the connection timed out.

Troubleshooting direction:

  • Make sure the master library allows slave library IP access, and the default port is 3306.
  • Check the firewall settings, including system firewall and cloud platform security groups.
  • Increase connect_retry time to avoid interruptions caused by temporary network fluctuations.
  • Set the appropriate slave_net_timeout to control the time the slave library waits for the main library to respond.

If you are replicating in a public network environment, it is recommended to enable a compressed connection ( replicate-compressed ) to reduce the impact of network latency.

4. Duplicate entry error (Error 1062) on slave

This error indicates a unique key conflict occurred when inserting a record from the library.

Cause analysis:

  • The main library operates normally, but the slave library already has records of the same primary or unique key for some reasons (such as manual insertion and error deletion of data).
  • Or the master-slave auto-increasing IDs are inconsistent.

Coping strategies:

  • You can use SHOW SLAVE STATUS\G to view specific conflict statements.
  • If confirming that the conflict statement does not affect the business, you can also use SQL_SLAVE_SKIP_COUNTER to skip it.
  • The more fundamental solution is to unify the self-increase settings of the master and slave to avoid human intervention in data writing.

When encountering these common replication errors, don’t panic. Look at the log first and then check the status. In most cases, you can find the corresponding causes and solutions. Basically, these are all things that are often encountered in daily operation and maintenance.

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