We are running Oracle Streams where we are streaming selective tables
from four different Oracle ERP systems geographically located at
different locations (US, EU). Tables are getting streamed to a central
database. What we seen is that:
- Streams APPLY will need to be tune to get a good performance.
Initially we had issues with the APPLY speed but once APPLY was tuned,
tables are staying in synch most of the time.
- The main issue is with the long running transactions where we have
seen that APPLY lags behind by several hours on large spilled
transactions. According to Oracle, this is a limitation of Streams and
the solution is to run those batch jobs directly against the APPLY
database.
-----Original Message-----
From:
[email protected]On Behalf Of Guillermo Alan Bort
Sent: Friday, February 03, 2012 11:38 AM
To:
[email protected]Cc: Oracle-l
Subject: Re: Oracle Streams
You can try GoldenGate (though I've had some problems with it) or look
into
Active DataGuard (which is a pretty expensive option)
There's also the posibility of using MViews on a DB Link if you have a
stable and private link between the two sites... I have seen this
working
several years ago, on 9i databases. I think they called it advanced
replication or something like that. It's a lot of work to set up, but
once
it's there it's pretty easy to maintain. And the 10g scheduler is far
better than the dbms_jobs that 9i had for scheduling the refresh
operations.
hth
Cheers
Alan.-
On Fri, Feb 3, 2012 at 12:48 PM, Peter Barnett wrote:We are looking at keeping a remote database at a vendor site updated.
Timing is not terribly critical since one of the options is running a
batch ETL job on a daily basis.
Another option is to use Oracle Streams. Our previous experience with
this product has not been very positive but that has been several years
ago. It was high maintenance for the DBA and we had a problem on the
target server maintaining RI without disabling a lot of triggers.
Given the choices, has Streams improved enough to reconsider it?
Pete Barnett
Database Technologies Lead
Cambia Health Solutions
[email protected]--
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