Re: Autovacuum integration patch

Tom Lane wrote:

>"Matthew T. O'Connor" <matthew@zeut.net> writes:
>
>
>>The current implementation of XID wraparound requires that the vacuum
>>command be run against the entire database, you can not run it on a per
>>table basis and have it work.  At least that is my understanding,
>>
>>
>
>No, you're wrong.  VACUUMing of individual tables is perfectly good
>enough as far as XID wrap protection goes, it's just that we chose to
>track whether it had been done at the database level.  If we tracked it
>in, say, a new pg_class column then in principle you could protect
>against XID wrap with only table-at-a-time VACUUMs.  (I think you'd
>still want the pg_database column, but you'd update it to be the minimum
>of the per-table values at the completion of any VACUUM.)
>
>At the time this didn't seem particularly worth the complication since
>no one would be likely to try to do that manually --- but with
>autovacuum handling the work, it starts to sound more realistic.
>

Good, I'm glad I'm wrong on this.  This will be another nice advantage
of autovacuum then and should be fairly easy to do.  Any thoughts on
this being a change we can get in for 8.1?

Matt