IBM Mainframe Forum

by **samb01** » Tue Sep 04, 2018 5:39 pm

Hello,

i would like to compact all the dataset of a storage group (COMPACTION = YES in the DATACLASS)

I read the datasets must be extended format.

But in this link : https://www.ibm.com/support/knowledgece ... cocfds.htm

I read :

A compressed format data set cannot be opened for update.

Please could you tell me if i am right. This means that the dataset musn't be in DISP=MOD in a JOB ?

Because, today, in our production, there are many jobs that use the DISP=MOD. This means those batchs would abend if i use the Compaction ?

by **enrico-sorichetti** » Tue Sep 04, 2018 5:54 pm

why not run a simple test Yourself ?

by **samb01** » Thu Sep 06, 2018 8:11 pm

I did it and it works so i can't anderstand :

Select all

A compressed format data set cannot be opened for update.
 

by **NicC** » Fri Sep 07, 2018 12:39 am

Did you actually update it? Or did you just open it?

by **samb01** » Fri Sep 07, 2018 12:24 pm

I used this JCL :

Select all

//SNCV0001 EXEC PGM=ICEGENER                                            
//SYSPRINT DD SYSOUT=*                                                  
//SYSIN    DD DUMMY                                                     
//SYSUT1   DD DISP=SHR,DSN=X.DATIN     ==> dataset with compaction 
//         DD DISP=SHR,DSN=Y.DATA           ==> dataset with compaction 
//SYSUT2   DD DISP=MOD,DSN=Y.DATA     ==> dataset with compaction 

 

This JCL work and do not Abend !

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