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What is the difference between specifying DISP=OLD and DISP=SHR for a dataset?

DISP=OLD denotes exclusive control of the dataset; DISP=SHR means there is no exclusivity.
Asked by: Interview Candidate | Asked on: Oct 13th, 2004
Showing Answers 1 - 1 of 1 Answers

Answered On : Oct 11th, 2005

DISP=OLD --> Exclusive HOLD. Read from beginning of dataset. But if u write, then it will overwrite on existing data. i.e old data is lost. DISP=MOD --> Exclusive HOLD. You can write to the end of the file without loosing your old data (i.e append the data to the existing file). DISP=SHR --> multiple user can share the data. Its read-only file.With Regards to COBOL:DISP=SHR and OPEN EXTEND in-file => will append the file at the end. Used mainly for line-sequntial file (i.e notepad with extension .TXT or .DAT)DISP=MOD and OPEN I-O =>  will also append the file at the end. (not used for line sequantial file)

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