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help / color / mirror / Atom feedFrom: Paul M. Aoki <[email protected]>
To: V.Grabner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Subject: Re: hash indices
Date: Tue, 05 Mar 96 15:46:19 -0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
"V.Grabner" <[email protected]> writes:
> We had the same problem when using hash indices. Hash indices
> alsways crashed the database when creating an index or inserting
> > 50 rows into the table.
>
> Do not use them, use btree indices instead.
>
> I tried to trace the problem but I did not find it. I found
> out it always happend during the split of an hash page but I
> never found out why. Without documentation I was lost.
the hash index split code is really, really broken in 4.2. it doesn't
surface until you hit some fill factor (i.e., get a bunch of page
collisions), but after that the hash index is corrupt. i think the
fixes (bug fixes, taking out the bogus "high concurrency" locking,
rewriting the split code) made it into some release of pg95 or
another..
--
Paul M. Aoki | University of California at Berkeley
[email protected] | Dept. of EECS, Computer Science Division (#1776)
| Berkeley, CA 94720-1776
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