| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Neil Conway <neilc(at)samurai(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: locks in CREATE TRIGGER, ADD FK |
| Date: | 2005-03-23 04:33:02 |
| Message-ID: | 200503230433.j2N4X2m25327@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
Neil Conway wrote:
> Tom Lane wrote:
> > Utterly wrong. When you commit you will physically drop the old table.
> > If there is a SELECT running against the old table it will be quite
> > unhappy after that.
>
> How can we drop the file at commit, given that a serializable
> transaction's snapshot should still be able to see old relfilenode's
> content?
Vacuum will not remove any old rows because of the transaction xid so
why does it care if the table is clustered/reindexed? It doesn't have
the table open yet.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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