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Re: Buffer access rules, and a probable bug

From: Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Vadim Mikheev <vmikheev(at)sectorbase(dot)com>, pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: Buffer access rules, and a probable bug
Date: 2001-07-03 03:27:58
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Lists: pgsql-hackers
Tom Lane wrote:
> I have been making some notes about the rules for accessing shared disk
> buffers, since they aren't spelled out anywhere now AFAIK.  In process
> I found what seems to be a nasty bug in the code that tries to build
> btree indexes that include already-dead tuples.  (If memory serves,
> Hiroshi added that code awhile back to help suppress the "heap tuples
> != index tuples" complaint from VACUUM.)


> I believe that nbtree.c's btbuild() code is currently in violation of
> these rules, because it calls HeapTupleSatisfiesNow() while holding a
> pin but no lock on the containing buffer.

OK, we had better avoid using heapam routines in btbuild() ? 


Hiroshi Inoue

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