Reset (Re-Sync) Mysql Master-Slave Replication

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Some times we face issue in MySQL replication and slave could not sync. The cause of this issue may have lots of reason. Following Steps help you to start Re-Sync Mysql.


Note:-When you Re-Sync MySQL Replication all of your bin-log files will be deleted, so if you want, you may take a backup of bin-log files first and then follow the instructions.

Step 1: Slave Server

First we need to stop slave from slave server using following command.

# mysql> STOP SLAVE;

Step 2: Master Server

  • After stopping slave go to master server and reset the master using following command.
  • # mysql> RESET MASTER;
  • Take dump of Master Server Database.
  • # mysqldump -u username –p techoism > techoism.sql
  • After taking backup unlock the tables.
  • # mysql> UNLOCK TABLES;

    Step 3: Slave Server

  • Restore database from taken backup.
  • # mysql -u root –p techoism < techoism.sql
  • Login mysql and Reset Slave using following command.
  • # mysql> RESET SLAVE;
    # mysql> CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=1;
  • After resetting slave start slave replication.
  • # mysql> START SLAVE;
  • Now your replication has been re sync and check the slave status.
  • # mysql> show slave status\G

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