PowerHouse 4GL question: database locking

[Ken Langendock]

Walter, If locking is an issue for you, use the method I have been promoting
all along.

Use QTP to extract everything. You can control individual files with
locking/output phase reading, etc.
Use QUIZ to only report the contents of the subfile. IMHO, QUIZ is dumb,
this is all it is good for.
I can't stand it when I have one simple error in QUIZ and every single line
from that point on shows up as an error. DUMB!

If you structure your extracts properly you can produce very fast extracts.

Ken

-----Original Message-----
From: powerh-l-bounces+ken.langendock=rogers.com at lists.sowder.com
[mailto:powerh-l-bounces+ken.langendock=rogers.com at lists.sowder.com] On
Behalf Of Robert Mills
Sent: October 5, 2007 4:48 AM
To: Walter J. Murray; HP3000-L at RAVEN.UTC.EDU; powerh-l at lists.sowder.com
Subject: RE: PowerHouse 4GL question: database locking

Hi Walter,

QTP:

I agree with you on this.

QUIZ:

The only way I have found of preventing anybody from modifying the data
underneath me is to do a SET DBMODE 4 (modify allow concurrent read (mode
6)), SET DBMODE 7 (exclusive read) or SET DBMODE 8 (read allow concurrent
read).

Mode 7 is extremely unfriendly to other users and should be avoided at all
costs.
Mode 4 gives you the same results as mode 8 but might incur some additional
database overhead.

Doing this can cause problems if everything else uses modes 1 and 5.

BTW: Did you know that version 8.49.E is now available? The main thing you
will get from doing this upgrade is the enhancement to QUIZ's report line
size. They have increased it from 264 to 32,767.

regards,
 
Robert W.Mills
Business Systems Development Analyst
Group Information Systems & Technology
Pinnacle Arvato
DDI: +44 (0)20 8309 3604 


-----Original Message-----
From:
powerh-l-bounces+robert.mills=pinnaclearvato.co.uk at lists.sowder.com
[mailto:powerh-l-bounces+robert.mills=pinnaclearvato.co.uk at lists.sowder.
com] On Behalf Of Walter J. Murray
Sent: 05 October 2007 05:15
To: HP3000-L at RAVEN.UTC.EDU; powerh-l at lists.sowder.com
Subject: PowerHouse 4GL question: database locking

Greetings,

I'm in the process of learning PowerHouse 4GL, and I'm trying to understand
how it manages database locking.

The environment is PowerHouse 8.39.C1 on MPE/iX 7.5, TurboIMAGE access modes
1 and 5.

As I understand it, the default for QTP, whether in mode 1 or mode 5, is to
lock the whole database for the duration of the run.  The SET LOCK statement
can be used to change the locking level, or even to eliminate locking
completely (assuming the database is not being modified).
Unless locking is suppressed, interactive QTP attempts a conditional lock
every few seconds until it is satisfied or the user interrupts it; batch
mode QTP does an unconditional lock.  This is all documented in the QTP
Reference.

Please correct me if I don't have that completely right.

The question is about QUIZ.  As I understand it, the default access mode is
5, but QUIZ doesn't do database locking.  Can this be right?  Is there no
way to make QUIZ lock the database while accessing it, as a protection
against other users modifying the same data that QUIZ is accessing?

Thanks for bearing with my beginner's questions.

Walter  

Walter J. Murray




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