Reorganize the files on your system

With this tip you'll learn how to reorganize the files on your system, and check all PFs daily for deleted records.

I've created the following CL program to reorganize the files on my system. What it will do is check all PFs daily for deleted records. The total disk space used by these deleted records is logged to a file. On Sunday the program will start reorganizing the files in the order of total disk space that will become available after the reorganization of the file. No more worries about deleted records using up a lot of space. Here is the...

code of the CL program. The query is used to do a calculation on the amount of space in deleted records: Using the outfile from the dspfd in the query you have to define the following fields:

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

Select records: MLLIB NLIKE 'Q%'
MLFILE NLIKE 'Q%'
Sort to have the biggest TOBEFREED value on top.
Output the query to REORGIT file.


  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           

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This was first published in March 2002

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