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
 

 

for large files, can sort input & outfile be the same fi

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> DFSORT/ICETOOL
View previous topic :: :: View next topic  
Author Message
quanzhong

New User


Joined: 12 Aug 2008
Posts: 46
Location: china

PostPosted: Tue Jul 08, 2014 2:37 am    Post subject: for large files, can sort input & outfile be the same fi
Reply with quote

eg.
Code:

//SORTIN    DD DISP=SHR,DSN=A
//SORTOUT DD DISP=SHR,DSN=A
//SYSIN       DD *
   option copy
   outrec ifthen=(when=(condition),overlay=())
/*


for small files, the result is OK.
for large files, sorting completed, return code is 0, but number of record in output file is much less.

does anyone know the difference?
Back to top
View user's profile Send private message

vasanthz

Global Moderator


Joined: 28 Aug 2007
Posts: 1458
Location: Azeroth

PostPosted: Tue Jul 08, 2014 3:41 am    Post subject:
Reply with quote

Hello,
Quote:
For a copy application, the SORTIN data set should not be the same as the SORTOUT data set or any OUTFIL data set because this can cause lost or incorrect data or unpredictable results.

For a sort application, the SORTIN data set should not be the same as any SORTWKdd data set because this can cause lost or incorrect data or unpredictable results. The SORTIN data set can be the same as the SORTOUT data set or an OUTFIL data set, but this situation can lead to the loss of the data set if the sort application does not end successfully.

Simply said, don't use the same file as Input and Output.
http://ibmmainframes.com/about56709.html

Hope it helps,
Back to top
View user's profile Send private message
steve-myers

Active User


Joined: 30 Nov 2013
Posts: 477
Location: The Universe

PostPosted: Tue Jul 08, 2014 3:55 am    Post subject:
Reply with quote

For a sorting application, the input and output data set can specify the same data set. It is not recommended, but it will work because sort reads the entire input data set before it writes an output record.

For a copy application it will not work, as Vasanth already noted.
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 -> DFSORT/ICETOOL All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts Performing arithmetic on input field zh_lad DFSORT/ICETOOL 31 Tue Dec 06, 2016 8:04 pm
No new posts High CPU consumption Job using IAM fi... aswinir JCL & VSAM 15 Thu Dec 01, 2016 8:28 pm
No new posts Limit duplicate records in the SORT pshongal SYNCSORT 6 Mon Nov 21, 2016 12:54 pm
No new posts How to convert the VBM file to VB or... Sulabh Agrawal JCL & VSAM 4 Fri Nov 18, 2016 1:04 pm
No new posts Not able to compress a very large PDS Hervey Martinez JCL & VSAM 7 Fri Nov 04, 2016 5:57 pm


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