| From: | Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at> |
|---|---|
| To: | "'Tom Lane'" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | AW: CRCs |
| Date: | 2001-01-15 09:31:23 |
| Message-ID: | 11C1E6749A55D411A9670001FA6879633681B3@sdexcsrv1.f000.d0188.sd.spardat.at |
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| Lists: | pgsql-hackers |
> Instead of a partial row CRC, we could just as well use some other bit
> of identifying information, say the row OID. Given a block CRC on the
> heap page, we'll be pretty confident already that the heap page is OK,
> we just need to guard against the possibility that it's older than the
> index item. Checking that there is a valid tuple at the slot indicated
> by the index item, and that it has the right OID, should be a good
> enough (and cheap enough) test.
I would hardly call an additional 4 bytes for OID per index entry cheap.
Andreas
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