static and dynamic calls

mohu vellore · Member Joined: 10 Dec 2009 Posts: 4 Location: coimbatore

When static calls are used and when dynamic calls are used

Natarajan · Moderator Joined: 10 Oct 2008 Posts: 425 Location: chennai

COBOL - static call vs dynamic call.

static call -

If we use static call, load module of sub program will be added to main program/
When program execution started, main program and sub program both will be loaded into memory.

If there is a change to subprogram.
All the programs which are calling this sub program has to re-compile.

dynamic call -

If mainframe program uses dynamic call, subprogram will be loaded into memory
when call statement executed.

If there are many programs calling one sub program. if there are any changes to subprogram, wont impact calling programs. i.e, we dont required to re-compile.

---- Cases

1. If sub program needs to change frequently, better go for dynamic call.
so that calling cobol programs dont required to re-compile, every time cobol
subprogram modified.

2. If same program calling the sub program multiple times. Performance wise, better use static call. In this case, if we use dynamic call, it will load the program every time you call that program. so, in this case better you static call.
_________________
Natarajan
Chennai

Natarajan · Moderator Joined: 10 Oct 2008 Posts: 425 Location: chennai

Following dicussions will give more details on this.

http://www.mainframegurukul.com/MainframeGuru/Static-call-amp;-Dynamic-call-post3744.html

http://www.mainframegurukul.com/MainframeGuru/viewtopic.php?t=2510

http://www.mainframegurukul.com/MainframeGuru/How-can-i-tell-if-a-module-is-being-called-dynam-or-static-post3216.html
_________________
Natarajan
Chennai

mohu vellore · Member Joined: 10 Dec 2009 Posts: 4 Location: coimbatore

Thankyou Natarajan. your post is very much useful.

vaibhavad · Member Joined: 28 Jan 2010 Posts: 2

Statics calls are fast as compared to dynamic calls. Choose such calls for modules with small sizes(i.e. small codes) . Static calls with bigger size can cause space error. this can be solved by REGION parameter in JOB/STEP

Dynamic calls use less memory and are slower. But are useful for programs which require frequent modifications.

Example if i have a driver job which starts the billing of the system... i choose dynamic calls

If i have a utility to extract something, i use static calls.

Anuj Dhawan · Posted: Fri Jan 29, 2010 2:03 pm Post subject:

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