I haven't looked at the Communicator article yet, but could
it possibly be talking about the use of the 'DSEM' setting in
DBUTIL?  If so, then what this means is that within any Image
database, all datasets that are logically related (via set paths)
are considered an atomic unit when placing a lock on the
associated master dataset.  If a dataset that is not part of that
unit, then the lock will not affect it (as it would have in the
past since all masters went through a single semaphore).
  For most databases, this could increase performance in a heavy
update environment where multiple datasets are being updated by
different processes simultaneously.  This assuming they are not
part of the same "sub database".  The performance increase would
come by virtue of not having to wait on a lock that really wasn't
necessary in that circumstance anyway.

Regards,
Michael L Gueterman
Easy Does It Technologies
Allaire Alliance Partner
email: [log in to unmask]
http://www.editcorp.com
voice: (888) 858-EDIT -or- (509) 943-5108
fax:   (509) 946-1170
--

> -----Original Message-----
> From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On
> Behalf Of Leonard Berkowitz
> Sent: Thursday, August 20, 1998 8:23 AM
> To: [log in to unmask]
> Subject: [HP3000-L] "SUB-DATABASES"
>
>
> What does this mean and where can I read about it? This term
> is used in the
> Scalability section under TurboIMAGE/XL Enhancements in the
> 5.5 Express
> Communicator.
>
> ========================
> Leonard S. Berkowitz
> mailto:[log in to unmask]
> phone: (617) 972-9400 ext. 3250
> fax:   (617) 923-5555
>
>                  Tufts Health Plan - Waltham Ma. 02154
>