| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Closing some 8.4 open items |
| Date: | 2009-04-08 13:50:50 |
| Message-ID: | 603c8f070904080650u101ddb19m1e841a39a6237e9f@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Apr 8, 2009 at 1:17 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Tue, Apr 7, 2009 at 10:42 PM, Josh Berkus <josh(at)agliodbs(dot)com> wrote:
>>> So has fadvise been completely dropped from 8.4, or only partially?
>
>> Bitmap scans will support it, but index scans will not.
>
> And please note that we think bitmap scans are the larger part of
> the win anyway. What's left undone there is some marginal mopup.
Can you elaborate on this? I'm fuzzy on why index scans can't benefit
from this as much as bitmap index scans.
...Robert
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