Will deleting data in master automatically delete data in slave? I have data replication setup on MySQL.  If I delete data on the master, will replication know data was deleted and automatically delete the same data on slave?
Yes, it will automatic apply the delete on the slave, with some restrictions:


If you have replicate-do-db=db_name enabled, it will automatically filter out the statements to the given database names
If you have replicate-ignore-db=db_name enabled, it will automatically filter out statements to the given table names