Re: Oracle Streams and Uniqueness
- From: "Rajeev Prabhakar" <rprabha01@xxxxxxxxx>
- To: niall.litchfield@xxxxxxxxx
- Date: Mon, 10 Nov 2008 09:49:38 -0500
Hello Niall,
We have two databases utilizing schema based replication (10.2.0.3,
Linux - Oracle Streams)
and for at least some of the tables (that are being replicated), we do
not have any primary or
unique or a substitute key in either of the databases and replication
appears to be working fine.
So, unless something is happening under the hood (that is supposedly
not obvious - streams
related), given what I am seeing in our environment, I would not agree
with the second part of
the Analyst's statement (i.e. So each table in a Streams environment
should have a primary
key, unique key constraints or a substitute key).
-Rajeev
On Mon, Nov 10, 2008 at 9:21 AM, Niall Litchfield
<niall.litchfield@xxxxxxxxx> wrote:
> All,
>
> I am being told by a support analyst at Oracle re Streams that Oracle must be
> able
to identify uniquely and match corresponding rows at different databases.
So each table in a Streams environment should have a primary key, unique key
constraints or a substitute key.
>
> This in addition to supplemental logging. Is this correct? If so, surely
> this implies that streams is only useful in environments where tables are
> guaranteed (by Oracle or the application(s) running against it) to be
> unique. This seems a somewhat significant real-world disadvantage to me,
> based on the applications that I see. I guess I sort of hoped that Oracle
> might have used the ROWID to generated the LCR (in a way that I fully admit
> I have spend no time at all thinking about).
>
> Niall Litchfield
> Oracle DBA
> http://www.orawin.info
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