Re: What is Tid Scan

From: Hannu Krosing <hannu(at)tm(dot)ee>
To: ljguo_1234 <ljguo_1234(at)sina(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: What is Tid Scan
Date: 2002-09-04 13:50:57
Message-ID: 1031147457.3339.12.camel@taru.tm.ee
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On Wed, 2002-09-04 at 12:43, ljguo_1234 wrote:
> Hello everyone.
> I can't understand Tid Scan, Who can tell me what it's that and where I could find document on the Web. Thanks for your reponse.

It is scanning table by TupleID's. A tuple id is a 6-byte entity which
consists of 4-byte page number and 2-byte tuple index inside page.

So if you know the TID you can directly get the corresponding tuple.

--------------
Hannu

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