Re: PANIC killing vacuum process

Kevin Grittner ha scritto:
> Silvio Brandani <silvio(dot)brandani(at)tech(dot)sdb(dot)it> wrote:
>
>
>> we have develop a script to execute the vacuum full on all tables
>> of our very big database , since it is a 24 x 7 available system
>> we have not a timeframe to exec the vacuum full.
>> so we try with this script running the vauum full table by table
>> and if the vacuum generate the waiting status for other
>> connections we kill the vacuum .
>> But we encounter following problem:
>> with kill command:
>>
>> 2010-11-03 14:25:27 CET [19324]: [4-1] FATAL: terminating
>> connection due to administrator command
>> 2010-11-03 14:25:27 CET [19324]: [5-1] STATEMENT: vacuum full
>> analyze verbose tracking.as_history_status ;
>> 2010-11-03 14:25:27 CET [19324]: [6-1] PANIC: cannot abort
>> transaction 75073917, it was already committed
>>
>> with pg_cancel_backend(pid) command:
>>
>> CPU 0.18s/0.26u sec elapsed 3.79 sec.
>> ERROR: canceling statement due to user request
>> PANIC: cannot abort transaction 75081452, it was already
>> committed server closed the connection unexpectedly
>> This probably means the server terminated abnormally
>> before or while processing the request.
>> The connection to the server was lost. Attempting reset: Failed.
>> !> quit
>> -> \q
>>
>> the server crash and we have a service unavailiability on our
>> production system.
>>
>
> What version of PostgreSQL is this?
>
>
>> Is it possible to softly kill a vacuum process without risk a
>> panic ?????
>>
>
> Normally, yes. VACUUM FULL is more prone to problems than a normal
> vacuum, especially if you are using an old version. There are very
> few circumstances where VACUUM FULL is the right thing to use.
>
> Have you recovered your database yet? If so how? (Restart, PITR
> backup, pg_dump output, etc.)
>
> -Kevin
>
>
We had to kill the postmaster and restart the database recovering it.

thanks

--
Silvio Brandani

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