agora inbox for [email protected]  

help / color / mirror / Atom feed

From: Heikki Linnakangas <[email protected]>
To: Gregory Stark <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Re: Visibility map, partial vacuums
Date: Mon, 24 Nov 2008 17:55:08 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>

Gregory Stark wrote:
> However I'm a bit puzzled how you could possibly maintain this frozenxid. As
> soon as you freeze an xid you'll have to visit all the other pages covered by
> that visibility map page to see what the new value should be.

Right, you could only advance it when you scan all the pages covered by 
the visibility map page. But that's better than having to scan the whole 
relation.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com

view thread (54+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected]
  Subject: Re: Visibility map, partial vacuums
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox