what is the difference between stop and abort?

Answers were Sorted based on User's Feedback



what is the difference between stop and abort?..

Answer / vijay

Do not use abort unless absolutely necessary. It is messy.
Using stop is a cleaner way, and because it is cleaner, it
often takes more time.
Here's the difference:
ABORT is equivalent to:
1. Kill -9 on Unix (NOT kill -7) but YES, Kill -9
2. SIGTERM ABEND (Force ABEND) on Mainframe
3. Windows FORCE QUIT on application.
What does this do?
Each session uses SHARED/LOCKED (semaphores) memory blocks.
The ABORT function kills JUST THE CODE threads, leaving the
memory LOCKED and SHARED and allocated. The good news: It
appears as if AIX Operating system cleans up these lost
memory blocks. The bad news? Most other operating systems
DO NOT CLEAR THE MEMORY, leaving the memory "taken" from
the system. The only way to clear this memory is to warm-
boot/cold-boot (restart) the informatica SERVER machine,
yes, the entire box must be re-started to get the memory
back.
If you find your box running slower and slower over time,
or not having enough memory to allocate new sessions, then
I suggest that ABORT not be used.
So then the question is: When I ask for a STOP, it takes
forever. How do I get the session to stop fast?
well, first things first. STOP is a REQUEST to stop. It
fires a request (equivalent to a control-c in SQL*PLUS) to
the source database, waits for the source database to clean
up. The bigger the data in the source query, the more time
it takes to "roll-back" the source query, to maintain
transaction consistency in the source database. (ie: join
of huge tables, big group by, big order by).
It then cleans up the buffers in memory by releasing the
data (without writing to the target) but it WILL run the
data all the way through to the target buffers, never
sending it to the target DB. The bigger the session memory
allocations, the longer it takes to clean up
.
Then it fires a request to stop against the target DB, and
waits for the target to roll-back. The higher the commit
point, the more data the target DB has to "roll-back".
FINALLY, it shuts the session down.
WHAT IF I NEED THE SESSION STOPPED NOW?
Pick up the phone and call the source system DBA, have them
KILL the source query IN THE DATABASE. This will send an
EOF (end of file) downstream to Informatica, and Infa will
take less time to stop the session.
If you use abort, be aware, you are choosing to "LOSE"
memory on the server in which Informatica is running
(except AIX).
If you use ABORT and you then re-start the session, chances
are, not only have you lost memory - but now you have TWO
competing queries on the source system after the same data,
and you've locked out any hope of performance in the source
database. You're competing for resources with a defunct
query that's STILL rolling back.

Is This Answer Correct ?    14 Yes 0 No

what is the difference between stop and abort?..

Answer / bsgsr

stop command immediately kills the reading process and
doesnt have any timeout period.

abort command gives a time out period of 60secs to the
informatica server to finish the dtm process else it kills
the dtm process.

reach me on bsgsr12@gmail.com

Is This Answer Correct ?    15 Yes 2 No

what is the difference between stop and abort?..

Answer / kalpana

stop is a command used to stop a session or a batch
abort is similar to stop except it has a 60 second timed out

Is This Answer Correct ?    10 Yes 2 No

Post New Answer

More Informatica Interview Questions

What is the difference between Active and Passive transformation?

0 Answers   Informatica,


How can you generate reports in informatica?

0 Answers  


how do u tune queries?

1 Answers  


How do you load only null records into target? Explain through mapping flow.

0 Answers  


Explain your project of banking domian.

0 Answers   Cap Gemini,






If one flat file contains n number of records., we have to load the records in target from 51 to 100.. how to use expressions in Informatica..?

6 Answers  


What are the ETL tools available in DWH?

6 Answers   Mphasis,


What is incremental aggregation?

0 Answers  


How to Explain My project flow,In TCS ased me this question. In which way i can start my project flow and they asked how many fact tables and dimensional tables u used. Can any one Explain Briefly for this question and project architecture also.. please..

3 Answers   CTS, HCL, Infosys, TCS,


Describe expression transformation?

0 Answers  


which one is better performance wise joiner or look up

0 Answers   Informatica,


In aggregator transformation, I sort the data before aggregator and select sorted port but still I’m getting an error. What is that error?

2 Answers  


Categories