Frequent DBERROR DB4

[Igor Brezac]

On Wed, 9 Nov 2005, Stephen Conway wrote:

> Hello:
>
> But, can these cause the server to eventually stop responding?  POP and IMAP

Not unless the locker number continues to grow.

> connections are no longer possible, and after a restart it comes back.  So
> the next question is, should I consider an upgrade, and if so, what steps
> should I consider?  What should I backup prior to installing?  Am I able to
> use the rpm?

Upgrade cyrus will fix your problem.

-Igor

>
> Thanks,
>
> Steve
>
> -----Original Message-----
> From: Marcelo H. Terres [mailto:mhterres at gmail.com]
> Sent: Wednesday, November 09, 2005 2:25 PM
> To: Stephen Conway
> Subject: Re: Frequent DBERROR DB4
>
> http://asg.web.cmu.edu/cyrus/download/imapd/faq.html
>
> Q: I'm getting messages in imapd.log like:
>
> Sep 11 17:23:55 ogg lmtpd[773]: DBERROR db3: 16 lockers
> Sep 11 17:23:55 ogg lmtpd[1409]: DBERROR db3: 17 lockers
> Sep 11 17:23:56 ogg lmtpd[1508]: DBERROR db3: 9 lockers
> Sep 11 17:23:56 ogg lmtpd[776]: DBERROR db3: 9 lockers
>
> What's wrong?
>
>   A: Nothing is wrong. These messages are logged whenever Berkeley
> db encounters lock contention, but isn't necessarily a problem by
> themselves. This is especially likely when you have an empty or small
> duplicate delivery database and are receiving a large volume of
> e-mail.
>
>   Berkeley db 4.0 has a bug where the number of lockers isn't
> decremented properly, causing this number to be unreliable.
>
> []
>
>
> 2005/11/9, Stephen Conway <sconway at wlnet.com>:
>> Hello:
>>
>> We have a Cyrus IMAPD server version 2.1.12 running on a RH 8 server.  All
>> is working find up until last week, now we are getting increasing errors
> as
>> follows:
>>
>> Nov  7 22:36:33 antar lmtpd[1057]: DBERROR db4: 50 lockers
>>
>> The number before lockers keeps going higher and higher until eventually
> the
>> server stops receiving pop and imap connections.  After a restart of the
>> server, it starts over again.  My question is, how can I stop these, and
> why
>> after a reboot does it reset down to 1 again?  I have read a bit in the
>> archives and it seems that this has something to do with Berkley DB and
> that
>> updating to newest version of Cyrus should fix this, is this correct?  If
>> so, what are the necessary steps to install the latest version, preserving
>> the existing system, users, messages, etc.
>>
>> In addition, previous version was not installed with the RPM, can you let
> me
>> know where to find the RPM for RH8?
>>
>> Any light you can shed is appreciated.
>>
>> Regards,
>>
>> Steve
>>
>>
>> --
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>> ----
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>>
>
>
> --
> Marcelo H. Terres
> mhterres at gmail.com
>
>
>

-- 
Igor