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Re: draft RFC: concept for partial, wal-based replication

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Craig Ringer <craig(at)postnewspapers(dot)com(dot)au>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: draft RFC: concept for partial, wal-based replication
Date: 2009-11-30 15:07:24
Message-ID: 3947.1259593644@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Craig Ringer <craig(at)postnewspapers(dot)com(dot)au> writes:
> Just a side note: in addition to its use for partial replication, this
> might have potential for performance-prioritizing databases or tablespaces.

> Being able to separate WAL logging so that different DBs, tablespaces,
> etc went to different sets of WAL logs would allow a DBA to give some
> databases or tablespaces dedicated WAL logging space on faster storage.

I don't think this can possibly work without introducing data corruption
issues.  What happens when a transaction touches tables in different
tablespaces?  You can't apply the changes out-of-order.

			regards, tom lane

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