Re: Convert SAP Oracle Database to IBM DB2 Database??

From: Serge Rielau <>
Date: Fri, 08 Feb 2008 14:47:42 -0500
Message-ID: <>

DA Morgan wrote:
> Serge Rielau wrote:

>> Can't comment on the other points as I don't know their meaning in the 
>> context.

> ask <g>

I did.

> As I don't know if I know something I shouldn't talk about I am going
> to avoid too much here. If Mark wants to answer I will leave that to
> him.

And that was your answer...

> I find better compression and far better relative performance using
> Oracle's solution. The thing that I think Mark's team has nailed is
> when to perform the compression.

Well spit it out. What did you test? Note that DB2 has no DeWitt clause. No-one from IBM can come after you for posting your experience.

> Consider this ... you have a new, empty, table. You insert one row.
> What are you going to compress? Insert a second row. What are you
> going to compress? Fill the block. Ask the question again.
Why would you want to compress a small near empty table? There is virtually no benefit.

> No matter how you do it, to get back to the original point of the
> thread, it is a lousy reason to consider changing the back-end from
> product A to product B given what I've seen of both.
I don't think it is a lousy reason. It is an insufficient reason in isolation.
Let's give Charles some credit and assume that he is looking at more variables than these two (He also asked about patch certification).


Serge Rielau
DB2 Solutions Development
IBM Toronto Lab
Received on Fri Feb 08 2008 - 13:47:42 CST

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