From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jeff Frost <jeff@frostconsultingllc.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: separating improperly grouped page views
Date: Mon, 18 Jun 2007 01:54:53 -0400
Message-ID: <2169.1182146093@sss.pgh.pa.us> (raw)
In-Reply-To: <Pine.LNX.4.64.0706172157410.14506@discord.home.frostconsultingllc.com>
References: <Pine.LNX.4.64.0706172157410.14506@discord.home.frostconsultingllc.com>
Jeff Frost <jeff@frostconsultingllc.com> writes:
> [ umpteen million iterations of: ]
> -> Limit (cost=0.00..367.09 rows=1 width=8)
> -> Index Scan Backward using page_view_stamp_idx on page_view pv2 (cost=0.00..158215.86 rows=431 width=8)
> Index Cond: (stamp < $1)
> Filter: ((stamp IS NOT NULL) AND (visit_id = $0))
Perhaps an index on (visit_id, stamp) would help. This one is doing the
best it can, but if the visit_id's you want are thinly scattered, it'll
still suck...
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, jeff@frostconsultingllc.com
Subject: Re: separating improperly grouped page views
In-Reply-To: <2169.1182146093@sss.pgh.pa.us>
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