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Help understanding Master Slave replication behavior
Posted by: Pavin Joseph
Date: February 06, 2019 06:17PM

Hello MySQLers,

I'm new here and trying to understand the intricacies of MySQL Master Slave replication in version 5.5.

My current understanding/setup (please correct me where I'm wrong):

- GRANT statement updates the 'mysql' system database.
- In replication, master writes all transactions to binlog file, from which slave reads and copies to relay log file. The relay log file is then used to execute statements on slave.
- Setting binlog-do-db = mydb would tell master to only copy changes affecting mydb to binlog file.
- Not setting replicate-do-db or replicate-ignore-db on slave would execute all statements irrespective of DB from relay log file.

My problem with above setup:

Replication on slave failed with the following error
Last_Error: Error 'Table 'notmydb.sometable' doesn't exist' on query. Default database: ''. Query: 'GRANT SELECT,UPDATE on notmydb.sometable TO 'user'@'IPAddress' IDENTIFIED BY 'password''

My question:

- Why did master copy statements to be executed on 'mysql' database to binlog when I explicitly set it to copy only statements affecting mydb.

Thank you for consideration.

Kind regards,
Pavin Joseph.

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