| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
| Cc: | "Jim C(dot) Nasby" <jim(at)nasby(dot)net>, ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Dead Space Map version 2 |
| Date: | 2007-02-28 05:34:51 |
| Message-ID: | 25502.1172640891@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-patches pgsql-performance |
Heikki Linnakangas <heikki(at)enterprisedb(dot)com> writes:
> Tom Lane wrote:
>> I'd be happier if the DSM content could be
>> treated as just a hint.
> If we don't have a frozen state, we can't use the DSM to implement
> index-only scans.
To implement index-only scans, the DSM would have to be expected to
provide 100% reliable coverage, which will increase its cost and
complexity by orders of magnitude. If you insist on that, I will bet
you lunch at a fine restaurant that it doesn't make it into 8.3.
regards, tom lane
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