Re: WAL, xl_heap_insert and tuple oid mystry

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Greg Stark <gsstark(at)mit(dot)edu>
Cc: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, jagan <jaganrvce(at)yahoo(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: WAL, xl_heap_insert and tuple oid mystry
Date: 2011-04-12 23:34:45
Message-ID: 19423.1302651285@sss.pgh.pa.us
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers

Greg Stark <gsstark(at)mit(dot)edu> writes:
> On Tue, Apr 12, 2011 at 7:55 AM, Heikki Linnakangas
> <heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>> Maybe the WAL record you're looking at is a full-page image? A record with a
>> full-page image includes a verbatim copy of the page, and the individual
>> tuple is omitted in that case.

> It is? I thought full page images were only in addition to, not
> instead of any data in the record.

No, that's not the case.

> Doesn't pg_lesslog depend on this?

One hopes not.

regards, tom lane

In response to

Responses

Browse pgsql-hackers by date

  From Date Subject
Next Message Tom Lane 2011-04-13 00:43:43 Re: WAL, xl_heap_insert and tuple oid mystry
Previous Message Andres Freund 2011-04-12 23:14:06 [PATCH] Fix that NOSUPERUSER implies REPLICATION unless specified contrarily