- Computers & Software
check if dataset exists in jcl
How to check dataset existence using JCL
Some times dataset which is used as input to your job step may or may not exists. In that case job might abend with the JCL error.
In some cases the dataset which job step is going to create is already exists. In this case job will abend with error saying "Duplicate dataset exists".
To handle both the above cases we need to find the way to check whether the dataset exists or not. Based on the existence or non-existence of a dataset we might need to change the behavior of a job.
Example JCL to check for dataset existence using IDCAMS
The following example will explain how you can check whether the dataset exists or not
//TFILECHK JOB (T,XX,XXX),XXXXXXX,CLASS=S, // MSGCLASS=0,REGION=0M //STEP01 EXEC PGM=IDCAMS //SYSPRINT DD SYSOUT=* //SYSIN DD * LISTCAT ENTRIES('YOUR.DATASET.NAME') // IF RC = 0 THEN //* Write your JCL code here. This code will //* execute only if the dataset exists // ENDIF
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In the above code we are asking a question do you have dataset with name
"YOUR.DATASET.NAME". If the dataset exists then IDCAMS returns 0
If the dataset doesn't exists then returns the code which > 0
Based on the return code returned we can control the flow of execution using IF statement or we can also use Condition codes.
Example JCL code to check fro an empty file
Jon run details
IDCAMS shows file or dataset is exists(RC =0)
All steps ran fine
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What if datat set which i am trying to create is already exists.
First check whether the dataset exists or not by using the above explained code. If the dataset is exists i.e RC=0 then DELETE the dataset by using IEFBR14.
Later after the delete is done we can have a logic which will create the dataset.
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