RE: Checking if remote database is up
- From: "Mercadante, Thomas F (LABOR)" <thomas.mercadante@xxxxxxxxxxxxxxxxx>
- To: "'stephenbooth.uk@xxxxxxxxx'" <stephenbooth.uk@xxxxxxxxx>, "Oracle-L (E-mail)" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 26 Apr 2005 07:41:23 -0400
Stephen,
We have a similar situation. What we do is this:
Create a "ocella_available" table in your local database that indicates
whether the remote database is available. Run a cron job every minute that
does the simple query you are talking about. Depending on the response,
update the ocella_available table. In your application, check the
ocella_available table to see if it is ok to try and retrieve a record from
the remote database.
This works for us. The cron job will also send us email if the remote
database becomes unavailable so that we at least know about it.
Good Luck!
Tom
-----Original Message-----
From: stephen booth [mailto:stephenbooth.uk@xxxxxxxxx]
Sent: Tuesday, April 26, 2005 6:53 AM
To: Oracle-L (E-mail)
Subject: Checking if remote database is up
One of our new systems (Documentum from EMC) uses a database link to a
remote database (Ocella from Ocella) for some processes. Due to
organisation politics the people managing the Ocella database don't
tell the people managing Documentum when they're taking their system
down (the joys of working in the public sector). Documentum can do
most of it's functions when Ocella is down, it just can't do certain
transactions, unfortunately it's currently not very good at dealing
with situations where the Ocella database is down.
We're looking at some way of checking if the Ocella database is up
before trying a transaction that needs it then reporting back to the
user if it's down. What we're currently thinking of is putting an
empty table in the Ocella database then querying that from a PL/SQL
function over the link and trapping the error. If we get data or 'No
Rows Returned' then we know that the database is up and the link is
working. If we get an ORA-03113 then we know that the database is
down or the link isn't working for some other reason (e.g. Network
broken again). the function returns either TRUE or FALSE depending on
whether the remote dtabase is up or not.
Does anyone have experience of a similar situation? Is there a more
elegant/reliable method? Anything I've failed to consider that will
make this all blow up?
Thanks
Stephen
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