| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi> |
| Cc: | pgsql-patches(at)postgresql(dot)org, Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Subject: | Re: Page at a time index scan |
| Date: | 2006-05-05 19:13:04 |
| Message-ID: | 27275.1146856384@sss.pgh.pa.us |
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| Lists: | pgsql-patches |
Heikki Linnakangas <hlinnaka(at)iki(dot)fi> writes:
> The first solution that occurs to me is to force page splits to choose the
> target page so that it's blkno > the original page's blkno during vacuum.
I thought about that too, but don't like it for three reasons:
* it encourages index bloat, the more the longer the vacuum runs. Not
good, especially if you've got aggressive vacuum cost delay settings.
* there's a locking problem with respect to how you turn that behavior on.
* there's a failure mode where the behavior doesn't get turned off if
vacuum fails partway through.
regards, tom lane
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