How to Resynchronize a MySQL Master-Slave Replication Setup?

Resynchronizing MySQL Databases in Master-Slave Replication

In a MySQL replication setup, it may occur that the master and slave databases become out of sync. This can happen if the slave is removed from the network and reconnected after a period of time, or if there are other connectivity issues.

Procedure for Resynchronizing

To resynchronize the databases, follow these steps:

At the Master:

1. RESET MASTER;
2. FLUSH TABLES WITH READ LOCK;
3. SHOW MASTER STATUS; (note the values in the output)
4. Create a dump of the master database via mysqldump.

Transfer the Dump to the Slave:

Transfer the dump file to the slave server using a method such as scp.

At the Slave:

1. STOP SLAVE;
2. Load the master's dump via mysql.
3. Sync the slave and master logs using RESET SLAVE and CHANGE MASTER TO. (Replace the placeholder values with those obtained from the master's SHOW MASTER STATUS output)
4. START SLAVE;

Verification:

Check the slave status using SHOW SLAVE STATUS;. The output should indicate that both Slave_IO_Running and Slave_SQL_Running are Yes.

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