Find wasted space in files

Find wasted space in files

Administrators are often engaged when space utilization is high. Well, here is a way to discover "wasted" space in files that may "reuse" deleted records. One word of caution, check with your developers to assure you may reuse deleted records.

Prior to running the SQL below, I used STRQMQRY to run in batch. You'll need to use the DSPFD (TYPE *MBRLIST) command to populate an output file containing all of the file description information on the files you are interested in.

The query selects and displays file information, when the percentage of deleted records is greater than 25% of the number of active records. 

  
SELECT MLLIB,MLFILE,MLNAME,MLNRCD,MLNDTR,                         
MLNDTR+MLNRCD as "Tot Recs",                                      
decimal(round(MLNDTR/(MLNDTR+MLNRCD), 4), 5, 4)*100 AS "Pct Dltd",
decimal(round(MLSIZ2*(MLNDTR/(MLNDTR+MLNRCD)/1000), 0),15, 0)     
AS "K-Bytes Wasted",                                              
MLMTXT,MLSIZ2                                                     
FROM SYSLIB/PRDFILES WHERE MLNDTR > (.25 * MLNRCD)                
ORDER BY "K-Bytes Wasted" DESC

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This was first published in January 2005

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