Portal | Manuals | References | Downloads | Info | Programs | JCLs | Master the Mainframes
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Usergroups Profile Log in to check your private messages Log in
 

 

how many records can internal sort handle/store?

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> COBOL Programming
View previous topic :: :: View next topic  
Author Message
sreenigacc

New User


Joined: 16 Oct 2007
Posts: 15
Location: bangalore

PostPosted: Tue Oct 19, 2010 12:56 pm    Post subject: how many records can internal sort handle/store?
Reply with quote

Hi all,

by using internal sort how many records can we handle maximum in the program ?

Sreeni
Back to top
View user's profile Send private message

Anuj Dhawan

Senior Member


Joined: 22 Apr 2006
Posts: 6258
Location: Mumbai, India

PostPosted: Tue Oct 19, 2010 2:30 pm    Post subject:
Reply with quote

When you run an external sort the entire address space is dedicated to the sort process. This means that outside the sort program itself all of the storage is used for buffers for the sort strings.

With an internal sort less storage is available to the sort since the application program and any other elements (DB2 MQ etc.) take up some of that storage.

If the amount of data is small the difference in available storage is insignificant. The sort will run just as fast. In fact doing all the work in a program can be more efficient because the JCL allocation/deallocation steps are done once instead of once for the sort step and once for the program step.

So, "Which one is better" - This has long been a question as it relates to efficiency. The answer, actually, depends on how much data needs to be sorted and does not have some straight forward answer. The internal sort is simply an invocation of the same SORT utility that is JCL initiated (external sort).
Back to top
View user's profile Send private message
Anuj Dhawan

Senior Member


Joined: 22 Apr 2006
Posts: 6258
Location: Mumbai, India

PostPosted: Tue Oct 19, 2010 2:31 pm    Post subject:
Reply with quote

If you are a DFSORT user, see the following for more information on using DFSORT from COBOL vs directly: http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/ICE1CT10/6.0?DT=20080528173317

Something you might be intrested in:
Quote:
The way in which COBOL interfaces with DFSORT depends on the use of COBOL features such as FASTSRT, NOFASTSRT, USING, GIVING and INPUT and OUTPUT PROCEDUREs, and DFSORT features such as COBOL exits and DFSORT control statements. In general, the features you use are dictated by the needs of your application. But in many cases, an application can achieve its results using one or another of these features, that is, you have a choice. This chapter describes some of the COBOL and DFSORT features you can choose and the performance and productivity implications of doing so.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> COBOL Programming All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts How to change 'K' or 'M' use Sort vice_versa DFSORT/ICETOOL 5 Thu May 18, 2017 7:11 am
No new posts Check if any Detail records and extra... V S Amarendra Reddy SYNCSORT 19 Mon May 08, 2017 8:54 pm
No new posts Adding big TEXT lines to each record ... bshkris SYNCSORT 4 Sat May 06, 2017 1:40 am
This topic is locked: you cannot edit posts or make replies. SORT trick needed bshkris SYNCSORT 6 Tue May 02, 2017 4:35 am
No new posts SORT JSON type of data maxsubrat DFSORT/ICETOOL 8 Wed Apr 19, 2017 6:01 pm


Facebook
Back to Top
 
Mainframe Wiki | Forum Rules | Bookmarks | Subscriptions | FAQ | Tutorials | Contact Us