Re: Days Used = 0

[jcbradley@xxxxxxxxxxx (John C. Bradley)]

>I heard from someone else that the days-used field for a file is not always
>accurate, it can get corrupted during upgrades. Is there any truth to this?

What I've seen happen is the days used and date last used field 
get set to zero when the system was completely restored from 
tape after the addition of new disk.  I guess this makes sense, 
since the system has no way of knowing how long the restored 
objects were sitting out on tape before being restored.  
E.g., object XYZ got saved to tape on 8/14/99 and restored on 8/16/99.
It may have been used on the 15th, but the 8/14/99 tape doesn't 
know that.

This created problems for us, since we were going through programs 
fixing them for Y2K and really needed to know what was being used 
the most so we could address the most important stuff first and 
also identify code that was disused.

Every weekend this site executes 
DSPOBJD *ALLUSR/*ALL *ALL *SERVICE *OUTFILE QUSRSYS/OBJD 
to capture object information in a queryable database file.

The restore that wiped out the use info happened 8/15/99. 
I realized that I could restore the OBJD file from 8/14/99 
as file OBJD081499 and use it to update the date last used and 
days used info in future versions of OBJD.  The logic was 
that if the new date last used was zero, update it with the 
value from file OBJD081499.  Then sum the number of 
days used from both files and use that figure to update 
OBJD081499.

If I recall correctly, this happened on OS/400 V4R1. 
I suspect it happens on all releases . . . anyone know for sure?

Regards.

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