Phantom and Zombie process

ds_is_fun · Post by **ds_is_fun** » Wed Dec 27, 2006 9:18 am

I'd appreciate if someone can briefly tell me about phantom and zombie process in Datastage. Thanks!

DSguru2B · Post by **DSguru2B** » Wed Dec 27, 2006 9:30 am

Phantom process is a DataStage internal process. Thats the high level definition. A zombie is a process from Freddy Vs. Jason. Just messing with ya. Click here

narasimha · Post by **narasimha** » Wed Dec 27, 2006 11:34 am

To add to the list, a quote from Kenneth's post

kcbland wrote:Phantom errors occur when DS BASIC errors send messges to stdout, and since Server jobs don't have a screen component those messages are caught and return as "phantom" errors. Phantom is just the name of the background program used in DS Server to manage a task.

The most common messages are variable not assigned a value zero used, illegal datatype, abnormal termination, and non-numeric value.

DSguru2B wrote:A zombie is a process from Freddy Vs. Jason

Thats humorous.

ray.wurlod · Post by **ray.wurlod** » Wed Dec 27, 2006 3:49 pm

"Phantom" is DataStage terminology for "background process". You can trace the history of this usage back through UniVerse, Prime INFORMATION, PRIMOS, back to Pick O/S.

"Zombie" is a UNIX term, describing a process - typically a background process - that is prevented from being killed (or even from logging out) because it is unable to notify its parent process - probably because that parent process no longer exists. So even though you can send it a kill signal, it can not log out because it cannot notify its parent.