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Re: crash on 8.2 and cvshead - failed to add item to the
- From: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
- To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
- Cc: Joe Conway <mail(at)joeconway(dot)com>, "Hackers (PostgreSQL)" <pgsql-hackers(at)postgresql(dot)org>
- Subject: Re: crash on 8.2 and cvshead - failed to add item to the
- Date: Wed, 31 Jan 2007 10:46:37 +0000
- Message-id: <45C0738D(dot)10204(at)enterprisedb(dot)com>
Tom Lane wrote:
Are you still concerned about the PageGetFreeSpace issue?
Not anymore.The failure case I had in mind was not being able to find any valid split points when a page is full of max-sized index tuples. On a closer look, that doesn't seem to be a problem. Even though checksplitloc would incorrectly consider the split (HIKEY+item)-(HIKEY+item+item) as invalid, the split (HIKEY+item+item)-(HIKEY+item) is just as good. Similarly on the rightmost page, even if (HIKEY+item)-(item+item+item) is incorrectly considered as invalid, (HIKEY+item+item)-(item+item) is fine.
There also seems to always be some slack space because of alignments. -- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com
- References:
- crash on 8.2 and cvshead - failed to add item to the left sibling
- From: Joe Conway
- Re: crash on 8.2 and cvshead - failed to add item to the
- From: Heikki Linnakangas
- Re: crash on 8.2 and cvshead - failed to add item to the
- From: Heikki Linnakangas
- Re: crash on 8.2 and cvshead - failed to add item to the
- From: Tom Lane
- crash on 8.2 and cvshead - failed to add item to the left sibling
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