Re: Checkpoint cost, looks like it is WAL/CRC

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Greg Stark <gsstark(at)mit(dot)edu>, Russell Smith <mr-russ(at)pws(dot)com(dot)au>, josh(at)agliodbs(dot)com, Postgres Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Checkpoint cost, looks like it is WAL/CRC
Date: 2005-07-07 00:17:23
Message-ID: 42CC7493.4060907@commandprompt.com
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>>Tom, I think you're the only person that could or would be trusted to
>>make such a change. Even past the 8.1 freeze, I say we need to do
>>something now on this issue.
>
>
> I think if we document full_page_writes as similar to fsync in risk, we
> are OK for 8.1, but if something can be done easily, it sounds good.
>
> Now that we have a GUC we can experiment with the full page write load
> and see how it can be improved.

Question, with this option if the power goes out will I just roll
through the transaction logs like normal? Or are we talking the
potential to have to use something like pg_resetxlog or similar?

If it is just roll through the transaction logs then I have no problem
with it, let the user decide the level of reliance they have. If it can
cause actual, need to restore from backup level damage then it is a
literall no go IMHO.

Sincerely,

Joshua D. Drake

>

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