MySQL Forums
Forum List  »  Replication

Replication Problem
Posted by: Irfan Ali
Date: March 31, 2009 07:24AM

Hi,

I am using replication on mysql-4.1(Master) to mysql-4.1(Slave). Suppose Master DB inserting queries in binary log file at master-bin.01 at position 100.

And on slave somehow replication is stopped.
mysql-slave> show slave status\G

Master_Host: master-ip-address
Master_Log_File: master-bin.01
Relay_Log_File: slave-relay.01
Slave_IO_Running: No
Slave_SQL_Running: No
Read_Master_Log_Pos: 100
Exec_Master__Log_Pos: 50

After fixing slave problem when i run following command

mysql> START SLAVE;

starts Slave IO_THREAD and Slave SQL_THREAD. Because slave io_thread started that's why new relay log file created slave-relay.02 and slave io_thread resumes to log queries after position 100 (Read_Master_Log_Pos: 100) to new relay file slave-relay.02 file like position 101,102 .... onwards.

Now my question is what happen when slave sql_thread executes queries. When replication stopped it executed queries till position 50 (Exec_Master__Log_Pos: 50). Either it starts executing queries from new relay file slave-relay.02 if it does so than queries are missed between position 50 to 100 on slave ?

Or slave sql_thread finishes queries first from old relay file (slave-relay.01) by executing queries in it and then executes queries from slave-relay.02 ?

Regards,
Muhammad Irfan

Options: ReplyQuote


Subject
Views
Written By
Posted
Replication Problem
2520
March 31, 2009 07:24AM
1849
March 31, 2009 12:23PM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.