Q1.  What are the overhead costs of using DBXBEGIN  and  DBXEND / DBXUNDO
for dynamic rollback if logging is not enabled for the database?

Q2.  Dynamic Rollback uses the MPE/iX transaction manager.   What happens,
if anything, to the processes which access the database without DBXBEGIN or
DBBEGIN?

Q3.  As I understand it a DBXUNDO applies to all DB calls across multiple
databases.
Do I have this right?

Q4.   Any "gotcha's" one should know about?

I am implementing a system interface which needs to function like a
distributed database manager to process rather long logical transactions.
The target platforms are MPE/iX versions 4 and 5.
   The target database is ASK MANMAN.   MANMAN uses optimistic (read weak)
locking but I can't affort to use that "design strategy".


- Cortlandt Wilson