Reorganize your files automatically

Is your disk space mostly utilized? Check out this tip to see how you can change that.

One thing that will free up disk space is to reorganize your files. When deleting records from a file the space will not become available until you reorganize the file. The process of finding the files containing "deleted records" and reorganizing them can be automated. The CL program will check all files on your system for deleted records on a daily basis. On Sundays it will start to reorganize the files starting with the one that...

will free up the most disk space for you. The CL program should be put in the job scheduler to run daily.

 
=================
The CL program:
=================

PGM

DCLF       FILE(*LIBL/REORGIT)         
DCL        VAR(&DAY) TYPE(*CHAR) LEN(4)

 /* check what day it is*/              
                                                   
     RTVSYSVAL SYSVAL(QDAYOFWEEK)+
     RTNVAR(&DAY)
                                                   
/* on Sunday reorganize, every other day  */       
/* check all files for deleted space      */       

   IF COND(&DAY *EQ '*SUN') 
   THEN (GOTO CMDLBL(REORGANIZE))

DSPDLTSPC:  
DSPFD FILE(*ALLUSR/*ALL) TYPE(*MBRLIST)+
  OUTPUT(*OUTFILE) FILEATR(*PF) +  
  OUTFILE(QTEMP/ALLFILDESC)        
                                                          
    MONMSG MSGID(CPF0000)               
                                                                    
    RUNQRY QRY(*LIBL/DELETEDSPC)
                       
    GOTO CMDLBL(END)                   

   /* reorganize all files listed in REORGIT pf */
                                                  
REORGANIZE:
NEXT:     RCVF                  
          MONMSG MSGID(CPF0864)
          EXEC(goto DSPDLTSPC)

          RGZPFM FILE(&MLLIB/&MLFILE)
          MONMSG MSGID(CPF0000)
                         
          GOTO CMDLBL(NEXT)

END:      ENDPGM           
=================
The query:
=================
input file:
QTEMP/ALLFILDESC

Result fields:
TOTALRECS = MLNRCD + MLNdtr +1 
RECSIZE = MLSIZ2 / TOTALRECS 
TOBEFREED = RECSIZE * MLNDTR

Select records:
MLFILE    NLIKE 'Q%'
TOBEFREED GT    0

Sort fields:
TOBEFREED descending

output:
outfile REORGIT 

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This was first published in September 2002

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