RE: two instance -- one database
Date: Wed, 24 Sep 2008 13:01:24 -0400
Have you tested a multi-table join across the database link?
Pick two very large tables.
Create a query and run it on the source database with timing turned on.
Run the same query on the remote database and compare the timings.
This used to be a very big issue. The "where" clause used to be executed locally which means that all data from both tables was brought across the database link and joined locally. A very bad arrangement.
I agree with Tim Gorman. It accomplishes nothing and adds complexity at your personal cost. You will be tuning this arrangement forever.
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Brady, Mark Sent: Wednesday, September 24, 2008 11:07 AM To: oracle-l
Subject: two instance -- one database
I have a friend (no really, this isn't some lame way of telling you about me but trying to hide that by ... )
I have a friend, and at his company they have an Oracle database with tables and data. We'll call it Database A and they have another Database B that has views across dblinks to each of the tables in Database A. The data team says that this protects Database A from bad queries.
So can anyone think of any possible benefit from this arrangement? Will administration be easier, queries faster, performance more predictable? Anything?
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