| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Scott Marlowe <smarlowe(at)g2switchworks(dot)com> |
| Cc: | Ben <bench(at)silentmedia(dot)com>, pgsql general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: index creation on 7.3 |
| Date: | 2007-01-10 05:12:49 |
| Message-ID: | 27755.1168405969@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Scott Marlowe <smarlowe(at)g2switchworks(dot)com> writes:
> On Tue, 2007-01-09 at 17:17, Ben wrote:
> If I create an index on a table that needs to be vacuumed in 7.3, will the
> dead rows get indexed as well?
> Yes. I think. I'm pretty sure that's still true in 8.2. as well. The
> way indexes work is that the index points to the oldest version of a
> tuple in existence, said tuple which then points to the next newer
> version and so on.
IIRC, CREATE INDEX will ignore tuples that are "definitely dead", ie,
too old to be visible to any open transaction. It *will* (and must)
index tuples that are recently dead but might still be visible to some
open transaction.
regards, tom lane
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