Hans,

I was hoping someone with more expertise would chime in but I keep up on
patch levels so I can respond to some of your question..

Mr. White is indeed the authoritative person in regard to DDX and MDX and
his
paper on Robelle.com is definitely the one to read.

The problem you refer to about corruption was a serious one from the 5.5
days.
It has been patched and no serious ones like it have popped up that I am
aware of.

There are some corner cases when corruption can occur but the latest TI
patch
TIXMX73 should fix them. Without MX73 the possibility exists that if more
than
one dataset expansion (DDX or MDX) happens within one dbxbegin/dbxend and
then
rollback (dbxundo) the transaction you will get corruption. Fortunately the
corruption is in the userlabel and not in the data.

The scenario for this would be very complex transactions and very small
increments
on your expansions so it was a cornercase.

So, to answer your question - MDX is stable as is DDX. The caveat again, is
to
read the paper on Robelle.com and understand it.

Regards,

Guy Paul
HP MPE Support

> -----Original Message-----
> From: Hans-Ole Kaae, ScanConsult [mailto:[log in to unmask]]
> Sent: Thursday, October 31, 2002 04:41
> To: [log in to unmask]
> Subject: MDX - Masterset expansion - Status?
>
>
> Hi,
>
> We have been using and recommending the DDX concept for
> years. However,
> Fred White's (Sir Fred White, if I was in a position to recommend...)
> comments on the subject made me think of the status of this feature.
>
> Yes, we do exactly have those annoying production-stops from time to
> time where (small) masters become filled up during the day - normally
> we handle this by unloading and deleting old data - and reload these
> after the night's handling - but MDX would be a much better
> alternative
> since it would not cause any stops.
>
> We tried MDX way back then - and got corrupt data bases...
>
> Is MDX as stable as DDX by now?
>
> The 3000s being candidates for MDX run MPE/iX 6.5.
>
> Is this adequate?
>
> Are special patches necessary?
>
> Any comments or opinions will be most appreciated.
>
> /With kind regards Hans
> (Hans-Ole Kaae)
> ScanConsult IT-Partners
>
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