> I considered setting up triggers on Pgsql system tables to replicate DDL
> statements and replicate those system row changes much like user data, and
> to also use system table triggers to create replication triggers for newly
> added tables. But user triggers are not allowed on system tables, and I'm
> not sure it'd be reasonable or wise anyway. Comments or other ideas?
One potential problem you might run into is triggers on said added tables.
I had to disable my user-made triggers on slave databases because those
triggers would add rows to secondary audit tables, which were also covered
by replication. In other words, I would have had duplicate entries in my
audit tables... one for the master being replicated, one for the slave as
the trigger executed.
Additionally, I have functions that set timestamps to reflect the last
updated time of a row. If I kept the triggers on the mirrored database, the
timestamps will differ from the slave to the master (and possibly even the
other slaves).
I imagine things could get hairy pretty fast.
Greg
