From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Stuart <deststar(at)blueyonder(dot)co(dot)uk> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Is Patch Ok for deferred trigger disk queue? |
Date: | 2003-07-20 01:30:28 |
Message-ID: | 200307200130.h6K1USW02329@candle.pha.pa.us |
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Thread: | |
Lists: | pgsql-hackers |
Stuart, were are on this patch? Seems we need GUC additions, though I
can do that for you, and changes to write the head to disk. Was that
completed?
---------------------------------------------------------------------------
Stuart wrote:
> Tom Lane wrote:
>
> > Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> writes:
> >
> >>As a side question, it looks to me that the code stores the first trigger
> >>records in memory and then after some point starts storing all new records
> >>on disk. Is this correct? I'd wonder if that's really what you want in
> >>general, since I'd think that the earliest ones are the ones you're least
> >>likely to need until end of transaction (or set constraints in the fk
> >>case) whereas the most recent ones are possibly going to be immediate
> >>triggers which you're going to need as soon as the statement is done.
> >
> >
> > Good point. It would be better to push out stuff from the head of the
> > queue, hoping that stuff near the end might never need to be written
> > at all.
> >
> > regards, tom lane
> Hmmm.... I see your point. I will change the patch to write the head to
> disk and reenter when the development branch splits off.
> Also I've noticed that there is an fd.h which has file routines which I
> should be using rather than the stdio routines.
> I will also clean up those errors.
> Thank you,
> - Stuart
>
>
>
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--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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