From: Josh Berkus <josh@agliodbs.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
To: Stephan Szabo <sszabo@megazone.bigpanda.com>
Cc: Dani Oderbolz <oderbolz@ecologic.de>
Cc: pgsql-hackers@postgresql.org
Subject: Re: [SQL] "SELECT IN" Still Broken in 7.4b
Date: Thu, 21 Aug 2003 14:19:47 -0700
Message-ID: <200308211419.47226.josh@agliodbs.com> (raw)
In-Reply-To: <25062.1061498540@sss.pgh.pa.us>
References: <20030821102627.C51705-100000@megazone.bigpanda.com>
<25062.1061498540@sss.pgh.pa.us>
Tom,
> I'm toying with the notion of ripping out that logic and instead
> building an in-memory hashtable of already-returned TIDs. This could
> theoretically run out of memory if the multiple indexscan returns enough
> tuples, but I think in practice that wouldn't happen because the planner
> wouldn't choose an indexscan when very large numbers of tuples are being
> selected.
Don't forget all of the tyros who tune their queries through "set
enable_seqscan=false". I think we'd need some kind of memory safety valve on
this, like sandboxing it in sort_mem.
--
-Josh Berkus
Aglio Database Solutions
San Francisco
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To: pgsql-sql@postgresql.org
Cc: josh@agliodbs.com, tgl@sss.pgh.pa.us, sszabo@megazone.bigpanda.com, oderbolz@ecologic.de, pgsql-hackers@postgresql.org
Subject: Re: [SQL] "SELECT IN" Still Broken in 7.4b
In-Reply-To: <200308211419.47226.josh@agliodbs.com>
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