RE: Replication question

On performance of triggers blocking update of primary keys.

There are two aspects to performance. First, that which impacts on cpu cycles etc, and secondly, that which impacts on the integrity of the fundamental database design. I regard the latter as crucial - and non-negotiable. The former is a function of secondary issues such as machine power, load, use profile etc etc.

You can see what I am going to say - if Oracle won't protect your PKs from modification, then you must do it yourself, and take any load into account when specifying your hardware platform. I do know of relational databases which will absolutely preclude modification of PKs. It ought to be a given with an RDBMS.

As for our situation - no, these triggers don't impact us noticeably, but then we don't run a high tp environment. But I tell you what - they give me enormouse peace of mind!

peter
edinburgh

> -----Original Message-----
> From: Lowes, Harry (NESL-IT) [mailto:Harry.Lowes_at_npowernorthern.com]
> Sent: 21 June 2002 13:37
> To: Multiple recipients of list ORACLE-L
> Subject: RE: Replication question
>
>
> Peter,
>
> Great idea, but would you care to share the impact of these
> triggers on
> performance? I think it's a good principle to follow, but
> have always found
> triggers a little unwieldy for most operations myself. I
> would have thought
> this to be the case here, but I'd like to hear your experiences on the
> subject.
>
>
> Thanks awfully,
>
> Harry Lowes
> "My enthusiasm for both the job in hand and the welfare of my
> fellow man
> knows no bounds."
> Database Administrator and bon vivante,
> npower Northern Limited
>
>
>
> -----Original Message-----
> Sent: 21 June 2002 11:49
> To: Multiple recipients of list ORACLE-L
>
>
>
> Interesting comments on replication - but something hit me
> between the eyes.
>
> Primary Keys should NEVER, EVER be permitted to be updated,
> whether you are
> using replication or not. Its a basic tenent of relational
> design. We have
> been using triggers to prevent this for years.
>
> peter
> edinburgh
>
>
>
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> Author: Robson, Peter
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Robson, Peter
  INET: pgro_at_bgs.ac.uk

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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