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Re: [HACKERS] Timestamp field

From: "Jose' Soares Da Silva" <sferac(at)bo(dot)nettuno(dot)it>
To: Byron Nikolaidis <byronn(at)insightdist(dot)com>
Cc: "pgsql-hackers(at)postgreSQL(dot)org" <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: [HACKERS] Timestamp field
Date: 1998-06-11 10:56:07
Message-ID: Pine.LNX.3.96.980611105440.3123A-100000@proxy (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Wed, 10 Jun 1998, Byron Nikolaidis wrote:

> Am I right in my thinking that Postgres does not have a pseudo timestamp
> field that is updated whenever a row is added or updated?   Did it used
> to have one before time travel was removed?
> If no timestamp field, are there any other pseudo fields that are
> updated every time?  I noticed that the 'ctid' field seems to qualify,
> but what does something like (1,54) mean?
> Thanks for any help.
> Byron

Seems that XMIN field is updated whenever a row is inserted or updated.
see man sql.

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