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Re: SearchSysCache

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: uwcssa <uwcssa(at)gmail(dot)com>
Cc: "Bruce Momjian" <bruce(at)momjian(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: SearchSysCache
Date: 2007-01-02 21:36:06
Message-ID: 20579.1167773766@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
uwcssa <uwcssa(at)gmail(dot)com> writes:
> My program (indirectly) calls the following function twice,
> tuple = SearchSysCache(STATRELATT, ObjectIdGetDatum(relid),
> Int16GetDatum(colnum),  0, 0);
> The first time it assigns NULL to tuple, while the second time it
> assigns a valid pointer. Why is it like that?

You did an ANALYZE in between, perhaps?  That's the only operation
that puts new rows in pg_statistic.

			regards, tom lane

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