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Re: An idea on faster CHAR field indexing

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Giles Lean <giles(at)nemeton(dot)com(dot)au>
Cc: "Randall Parker" <randall(at)nls(dot)net>, "PostgreSQL-Dev" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: An idea on faster CHAR field indexing
Date: 2000-06-22 03:18:19
Message-ID: 7122.961643899@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Giles Lean <giles(at)nemeton(dot)com(dot)au> writes:
> My only experience of this was tuning a sort utility, where the extra
> time to convert the strings with strxfrm() and the large additional
> memory requirement killed any advantage strcmp() had over strcoll().
> Whether this would be the case for database indexes in general or
> ideed ever I don't know.

Interesting.  That certainly suggests strxfrm could be a loser for
a database index too, but I agree it'd be nice to see some actual
measurements rather than speculation.

What locale(s) were you using when testing your sort code?  I suspect
the answers might depend on locale quite a bit...

			regards, tom lane

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