Обсуждение: Additional startup logging

It seems potentially useful to LOG the version() string in the log
file during startup.  It might also help to LOG any settings which
might result in the loss of committed transactions or in database
corruption during startup.  (After a crash, the postgresql.conf file
might not show the values which were in effect during startup, and
it is too late to "show" the values.)
-Kevin

"Kevin Grittner" <Kevin.Grittner@wicourts.gov> wrote:

> It seems potentially useful to LOG the version() string in the log
> file during startup.  It might also help to LOG any settings which
> might result in the loss of committed transactions or in database
> corruption during startup.  (After a crash, the postgresql.conf file
> might not show the values which were in effect during startup, and
> it is too late to "show" the values.)

I think such logs depends on purposes, so they should be customizable.

You could write a module, that is registered in 'shared_preload_libraries'
and logs internal information you want from _PG_init() or shmem_startup_hook.

Regards,
---
Takahiro Itagaki
NTT Open Source Software Center

On Jun 30, 2010, at 22:43 , Takahiro Itagaki wrote:

>
> "Kevin Grittner" <Kevin.Grittner@wicourts.gov> wrote:
>
>> It seems potentially useful to LOG the version() string in the log
>> file during startup.  It might also help to LOG any settings which
>> might result in the loss of committed transactions or in database
>> corruption during startup.  (After a crash, the postgresql.conf file
>> might not show the values which were in effect during startup, and
>> it is too late to "show" the values.)
>
> I think such logs depends on purposes, so they should be customizable.
>
> You could write a module, that is registered in 'shared_preload_libraries'
> and logs internal information you want from _PG_init() or shmem_startup_hook.

For long-running systems, you may not have the beginning of the log file. Perhaps a method of dumping the version
and/orsetting information on demand (or perhaps at the beginning of each log file?): Shouldn't be too hard to put
togethera function which prints out such information via RAISE even now using PL/pgSQL. 

Michael Glaesemann
grzm seespotcode net