Received: from localhost (unknown [200.46.204.184]) by postgresql.org (Postfix) with ESMTP id 70B312E0042 for ; Mon, 18 Feb 2008 14:53:12 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.184]) (amavisd-maia, port 10024) with ESMTP id 96710-01-6 for ; Mon, 18 Feb 2008 14:52:54 -0400 (AST) Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 9A77B2E0058 for ; Mon, 18 Feb 2008 14:52:41 -0400 (AST) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m1IIqeho025569; Mon, 18 Feb 2008 13:52:40 -0500 (EST) To: Teodor Sigaev cc: pgsql-patches@postgresql.org, Gregory Stark , Jan Wieck Subject: Re: Proposed patch to change TOAST compression strategy In-reply-to: <47B95782.7090302@sigaev.ru> References: <26048.1203271939@sss.pgh.pa.us> <47B95782.7090302@sigaev.ru> Comments: In-reply-to Teodor Sigaev message dated "Mon, 18 Feb 2008 13:01:38 +0300" Date: Mon, 18 Feb 2008 13:52:40 -0500 Message-ID: <25566.1203360760@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200802/60 X-Sequence-Number: 4912 Teodor Sigaev writes: >> I have not done any performance testing of these changes --- does >> anyone have specific test scenarios they'd like to try? > That's very important change for text search, because of tsvector storage. > Headline and rank reads a lot of tsvectors. It seems to me that ranking test > will be very clear: rank function reads whole tsvector and returns small amount > of data (just a number). I have no test data sets with large tsvector fields. If you do, could you try it with this patch and see what the results are like? regards, tom lane