From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl> |
Subject: | Re: nested xacts and phantom Xids |
Date: | 2004-06-21 00:17:35 |
Message-ID: | 200406210017.i5L0HZL28396@candle.pha.pa.us |
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Lists: | pgsql-hackers pgsql-patches |
Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > Let me add that outside transactions read those phantom xid only when
> > they are doing dirty reads. What I don't understand is when do outside
> > transactions see tuples created inside a transaction? INSERT into a
> > table with a unique key?
>
> > Once the main transaction commits, these phantom tuples should work just
> > like ordinary tuples except they get their cmin overwritten when they
> > are expired, I think.
>
> You're not doing anything to increase my confidence level in this
> concept. You invented it, and even you aren't sure how it works.
And your point is? I am trying to help Alvaro. I came up with an
idea, and some thought it would help solve the problem. What ideas do
you have to help him?
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
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