只复制MySQL中的DDL

Question

I wonder if there is any easy way to keep the scheme consistent in two different MySQL clusters. Apart from classic replication, I would like to have a special "replication" which would reproduce all DDL queries (CREATE, ALTER, DROP, ...) on another cluster (namely the master of that cluster).

I don't need the actual data to be replicated.

Has anyone ever done or tried anything like this?

Answer 1

You can filter replication in MySQL based upon the database in which a query was executed. That doesn't prevent you making changes in other databases, however; So you can do;

USE ddl_repl_db;

ALTER TABLE other_db.foo ADD COLUMN <etc>

This relies on you configuring your servers correctly. I haven't set up MySQL replication for a while, but IIRC you can both filter what you send out from the master for replication and what you accept on the slave.

Answer 2

Old but still high in search.
So, on you DDL replica set all tables engine to BLACKHOLE