At 01:08 PM 10/2/97 -0400, Doug Werth wrote:
>>Hi, Barry ....   Jumbo datasets are not difficult to implement.  Adager
>>will politely create the necessary structures to support the new capacity
>>without any special effort on your part. <snip>
>
>Unfortunately too politely. I would like to see flashing lights and sirens
>warning the impending move to Jumbos. Many users are extremely happy with
>"plain old MPE" and have no experience with the HFS at all. They definitely
>need to know.

/Product Info - plug-alert

DBGENERAL's capacity change features are such that one cannot expand a set
into the jumbo world without explicitly requesting it.  Furthermore, one
can create jumbo sets, including controlling the capacity of individual chunk
files, without having to exceed 4GB dataset space in case one wants to become
familiar with all the caveats of using jumbo sets while testing in a smaller
environment.

/end-plug

Also keep in mind that when Express 3 is released and folks begin to
implement IMAGE b-tree indexes, the same issues on HFS files will apply
here as well.  And this will probably be more wide spread as there are
more smaller applications which might utilize b-tree indexes than need
the storage capacity of jumbo sets.

>>A couple of caveats:
>>Backups:  ensure that your backup software will support the new jumbo sets.

One also should check their other 3rd party products to ensure one has the
correct versions which support jumbo sets.  There still are some who are
using older versions of COGNOS, OMNIDEX, etc., which don't support jumbos
either because of dropped maintenance or because previously there wasn't
any need to install the upgrade....   :-)

I talked with a rather large site recently who needed to go jumbo but
hadn't finished certifying a critial 3rd-party application product which
they needed in order to go jumbo.  So they were struggling with their
limited capacity until they could complete the certification, update their
production systems and let it stabilize for awhile before making the leap....

All this may apply to b-trees as well....

<plug-alert>

By the way, the latest release of DBGENERAL, version 7.2, which we demo'd
at HPWorld, includes support for b-trees along with jumbo sets.

/end-plug

/snip

>Definitely get Adager. Or DBGENRAL.  If your databases are large enough to
>require Jumbos you should not be without a database tool. I know in Adager's
>newest version they have added a lot of therapy functions for fixing the
>jumbo problems described above. DBGENERAL may have similar features but I
>have no personal knowledge of it.

DBGENERAL's diagnostic and repair features indeed will assist in the analysis
and repair of structural problems which may arise related to jumbo sets.
If anyone has any questions, please contact us.



/jf
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