Re: Fix checkpoint skip logic on idle systems by tracking LSN progress

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От Stephen Frost
Тема Re: Fix checkpoint skip logic on idle systems by tracking LSN progress
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Msg-id CAOuzzgq8pHneMHy6JiNiG6Xm5V=cm+K2wCd2W-SCtpJDg7Xn3g@mail.gmail.com
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Ответ на Re: Fix checkpoint skip logic on idle systems by tracking LSN progress  ("Joshua D. Drake" <jd@commandprompt.com>)
Ответы Re: Fix checkpoint skip logic on idle systems by tracking LSN progress
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On Thursday, November 10, 2016, Joshua D. Drake <jd@commandprompt.com> wrote:
On 11/10/2016 09:33 AM, David Steele wrote:
On 11/10/16 10:28 AM, Stephen Frost wrote:

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
[...]
+                       if (log_checkpoints)
+                               ereport(LOG, (errmsg("checkpoint skipped")));

Do we really need to log that we're skipping a checkpoint..?  As the
point of this is to avoid write activity on a system which is idle, it
doesn't make sense to me to add a new cause for writes to happen when
we're idle.

log_checkpoints is not enabled by default, though, so if the user does
enable it don't you think they would want to know when checkpoints
*don't* happen?

Yes but I don't know that it needs to be anywhere below DEBUG2 (vs log_checkpoints).

Agreed. You certainly may wish to log checkpoints, even on an embedded or low I/o system, but logging that nothing is happening doesn't seem useful except perhaps for debugging. 

Thanks!

Stephen 

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