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SORT - Why no file contention

 
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rsantosh
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Joined: 20 Dec 2014
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PostPosted: Fri Dec 05, 2025 3:32 am    Post subject: SORT - Why no file contention Reply with quote
Hello,

Sorry for the silly doubt but I was under the impression that below SORT will result in file contention as SORTIN and SORTOUT file are same but job completed successfully and result was as expected(excluded few records).

Code:
//STEP01 EXEC PGM=SORT
//SYSOUT DD SYSOUT=*
//SORTIN DD DSN=SANTOSH.TEST,DISP=OLD
//SORTOUT DD DSN=SANTOSH.TEST,DISP=OLD
//SYSIN DD *
 SORT FIELDS=COPY
 OMIT COND=(9,2,CH,EQ,C'AB')
/*

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kolusu
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Joined: 26 Nov 2002
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Location: San Jose
PostPosted: Fri Dec 05, 2025 8:20 am    Post subject: Reply with quote
rsantosh,

The ENQueue of the dataset is reserved based on the jobname. In this case it is the jobname that is running. So you wouldn't get the contention error.

Btw using the same dataset for input and output for a COPY operation may cause unpredictable results. You can check the restriction here

https://www.ibm.com/docs/en/zos/3.2.0?topic=statement-general-coding-notes

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https://www.mvsforums.com/helpboards/viewtopic.php?t=2831
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Kolusu
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rsantosh
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Joined: 20 Dec 2014
Posts: 47
Topics: 11
PostPosted: Fri Dec 05, 2025 12:16 pm    Post subject: Reply with quote
Thank you so much. I can relax now. Smile
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kolusu
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PostPosted: Fri Dec 05, 2025 12:30 pm    Post subject: Reply with quote
rsantosh wrote:
Thank you so much. I can relax now. Smile


rsantosh,

Did you overlook this statement in my post?

Kolusu wrote:
Btw using the same dataset for input and output for a COPY operation may cause unpredictable results.

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rsantosh
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PostPosted: Fri Dec 05, 2025 1:37 pm    Post subject: Reply with quote
I did notice it and checked both the links. Whole day I was wondering why no contention bonk your reply was relieving Very Happy
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