From: Tom Lane <tgl@sss.pgh.pa.us>
To: Achilleus Mantzios <achill@matrix.gatewaynet.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: An unresolved performance problem.
Date: Fri, 09 May 2003 09:08:00 -0400
Message-ID: <151.1052485680@sss.pgh.pa.us> (raw)
In-Reply-To: <Pine.LNX.4.44.0305091611210.7304-100000@matrix.gatewaynet.com>
References: <Pine.LNX.4.44.0305091611210.7304-100000@matrix.gatewaynet.com>
Achilleus Mantzios <achill@matrix.gatewaynet.com> writes:
> On Fri, 9 May 2003, Tom Lane wrote:
>> Achilleus Mantzios <achill@matrix.gatewaynet.com> writes:
>>> If so, how can one find the correlation between the ordering
>>> of a table and a multicolumn index?
>>
>> Well, it is surely no better than the correlation of the index's
>> first column --- what is that?
> it is 1
Well, that's suggestive, isn't it? What about the remaining columns?
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, achill@matrix.gatewaynet.com, pgsql-performance@postgresql.org
Subject: Re: An unresolved performance problem.
In-Reply-To: <151.1052485680@sss.pgh.pa.us>
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