Re: The OVRDBF Command

["Simon Coulter" <shc@xxxxxxxxxxxxxxxxx>]

Hello Vikas,

You should read the ILE Concepts manual (SC41-3606) to understand activation 
groups.  An activation group is 
means of segmenting a given job space to different isolate parts of an 
application and so give the developer 
greater control over the use of system resources.  There are two types of 
activation group; default and 
named.  There are two types of default activation group; one for all the OS 
code and one for user code.  The 
default action for most of the CRTBNDxxx commands is to use the default 
activation group.  This gives similar 
behaviour to OPM programs and was chosen for backwards-compatibility.  Named 
activation groups are better and 
watch out for ACTGRP(*NEW) if you are using the CRTPGM command. (There were 
valid reasons 

*ACTGRPDFN can be specified on two parameters of the OVRDBF command; OVRSCOPE 
and OPNSCOPE.  In both cases 
the meaning is the same. Both these parameters scope (or limit) the override.  
In OPM programs OPENS are 
scoped to the job ??????? and OVERRIDES are scoped to the program call-level.  
*ACTGRPDFN provides a default 
value that scopes to the activation group if the OVRxxx is run in a named 
activation group (allowing the 
developer to determine which parts of the application are affected by the 
override), or scopes to the 
call-level if run in the default activation group (thus behaving like an OPM 
program override).

Activation groups are another useful tool but like all of ILE require design to 
make good use of them.

Regards,
Simon Coulter.

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//--- forwarded letter -------------------------------------------------------
> Date: Fri, 08 Jan 99 10:09:44 -0500
> From: "VIKAS TASKAR" <vtaskar@wipsys.ge.com>
> To: MIDRANGE-L@midrange.com
> Reply-To: MIDRANGE-L@midrange.com
> Subject: The OVRDBF Command

> 
> 
> Hi,
> 
> I would like to know the exact function of the *ACTGRPDFN
> option(Activation Group definition option),in the OVRDBF
> command.(Override database file)
> 
> When I seek help,it says that the Activation Group determines
> the sharing of ODP between programs,and is of 2 types,
> default/non-default.
> 
> Could someone enlighten me about the same?
> 
> Thanks in advance,
> 
>                   ------Vikas
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