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From Jason Kratz <jason.kr...@firm58.com>
Subject Re: Shutting down Connection Pool at runtime (for maintenance)
Date Mon, 29 Sep 2008 13:23:18 GMT
Just one last note on the backup procedures.  Make sure that whomever is 
responsible for that backup understands that you're going to lose any 
data between backups should a problem occur.   Are you willing to lose a 
full day's worth of data?    If it's a production database you shouldn't 
be running in noarchivelog mode (ie: closed backups).   You'll be able 
to recover far more data in archivelog mode where you can apply archived 
log files to your last backup.


Ian Zabel wrote:
> Quick update on this: We've found that we're able to shutdown and
> restart the database at will, and DBCP is able to recover connections
> once the database is back up. So for now, we do not need to restart
> our app servers, and there's no immediate need to change the backup
> procedures.
> We're looking into the suggestions offered, however. Thanks for the thoughts!
> Ian.
> On Wed, Sep 24, 2008 at 11:58 AM, Ian Zabel <ian@ezabel.com> wrote:
>> Very soon we're releasing our first build of our legacy app using
>> iBATIS! We've converted about 10% of our legacy SQL to iBATIS so far,
>> and it's really working great. Things are 15-30% faster compared to
>> our old framework (homegrown SOAP server for all data access).
>> We're using iBATIS with Tomcat 5.5 and DBCP over JNDI.
>> Every Sunday our Oracle DB is backed up cold. This means that all
>> connections to the DB must be closed. During this backup, our SOAP
>> server is shutdown. Now that we're moving forward with iBATIS, we have
>> another connection pool that we have to manage. This will eventually
>> become the only connection pool as we phase out the SOAP server.
>> However, during this cold backup, we would prefer to keep the Tomcat
>> server running so as to avoid losing all of our in-memory caches.
>> So, the question: Is it possible to somehow shutdown DBCP (or close
>> all of its connections) for a time while the backup occurs, yet leave
>> Tomcat running? And, after the backup is finished, start it back up?
>> Of course, the application would be inaccessible during this backup;
>> but that's how it's always been. I can't find anything on Tomcat,
>> DBCP, or iBATIS mailing lists that really discuss this issue, which of
>> course makes me question if we're doing this right.
>> Any thoughts?
>> Thanks,
>> Ian.

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