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Re: More FK patches

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com>
Cc: pgsql-patches(at)postgresql(dot)org
Subject: Re: More FK patches
Date: 2001-11-13 04:07:04
Message-ID: 625.1005624424@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> writes:
> This patch should help fix cases with two separate fk constraints
> in a row that happen to reference the same pk constraint with
> an on update cascade and similar cases.

Aren't those NOT EXISTS clauses going to cause a humungous
performance hit?

Seems it would be better for the RI triggers to do more in C code
and stop expecting the query engine to handle these things.  I've
always thought that ReferentialIntegritySnapshotOverride was an
absolutely unacceptable kluge, not least because it's turned on
*before* we do parsing/planning of the RI queries, and so is
likely to screw up system catalog checks.

			regards, tom lane

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