| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | andrew(at)supernews(dot)com, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Indexing dead tuples |
| Date: | 2005-09-01 02:08:48 |
| Message-ID: | 7596.1125540528@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> On Wed, 2005-08-31 at 19:06 -0400, Tom Lane wrote:
>> In fact, it had better be able to, since once the CREATE INDEX commits,
>> pre-existing xacts are responsible to insert index entries for anything
>> they insert into the table.
> So would it be possible to have CREATE INDEX call GetOldestXmin, just as
> VACUUM does, so it can work out which rows to ignore?
It already does. See IndexBuildHeapScan().
regards, tom lane
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