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How to clear the data in a Dataset?

 
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muralialla

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Joined: 03 Jan 2007
Posts: 11
Location: Chennai

PostPosted: Thu Jan 11, 2007 7:07 pm    Post subject: How to clear the data in a Dataset?
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Hi all

I need to re use a Dataset(PDS/PS) everytime. How to clear the data.....is there any direct command to do that?
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superk

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Joined: 26 Apr 2004
Posts: 4650
Location: Raleigh, NC, USA

PostPosted: Thu Jan 11, 2007 7:20 pm    Post subject: Re: How to clear the data in a Dataset?
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Personally, I use a DFSORT step in the job. In REXX, you could just open the output DD and write nothing:

"EXECIO 0 DISKW ddname (FINIS"
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kgumraj

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Joined: 01 May 2006
Posts: 151
Location: Hyderabad

PostPosted: Fri Jan 12, 2007 2:18 pm    Post subject: RE: How to clear the data in a Dataset?
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Hi,
use this step for that,

Code:

//S1    EXEC  PGM=ICEMAN                                   
//SYSOUT    DD  SYSOUT=*                                   
//SORTIN DD DSN=USZ9997.PREBIND.ZARC.G0040V00,DISP=SHR     
//SORTOUT DD DSN=USZ9997.PREBIND.ZARC.TEST,DISP=SHR     
//SYSIN    DD    *                                         
    OPTION COPY                                           
    OMIT COND=ALL                                         
/*                                                       
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Sat Jan 13, 2007 12:52 am    Post subject:
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Hello,

If you want to re-use the file by overwriting it in an application program, you can specify DISP=OLD in the JCL. An OPEN OUTPUT will create "new" output in the existing file.

One caution is that you may run out of the "old" space and abend when the "new" data is larger than the "old" data.

Do you want to reuse the file due to a catalog problem? If so, you can add an IEFBR14 step before the "catalog" step that will unconditonally delete the file. Here's an example of what i just described:
Code:
//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
//HSKP     EXEC PGM=IEFBR14                                             
//D1       DD DSN=MS.RDS.NEWRATE.M1006,DISP=(MOD,DELETE),UNIT=SYSDA,   
//            SPACE=(TRK,0)                                             
//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
//MCH1     EXEC PGM=DSCHMCH1                                           
//CAP      DD DSN=MS.RDS.CAP1006,DISP=OLD                               
//ELIG     DD DSN=MS.RDS.ELIG1006.SORTED,DISP=OLD                       
//NEWRATE  DD DSN=MS.RDS.NEWRATE.M1006,DISP=(,CATLG,DELETE),UNIT=SYSDA,
//            DCB=(RECFM=FB,BLKSIZE=0,LRECL=80),                       
//            SPACE=(CYL,(50,10),RLSE)                                 
//SYSPRINT DD SYSOUT=*                                                 
//SYSOUT   DD SYSOUT=*                                                 


The housekeeping step (HSKP) ensures that the file does not exist. That DISP parameter will delete the file if it exists or, create it then delete it if is does not already exist.

The second step (MCH1) runs a program that creates the file.

Please let me know if you'd like any other info.
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