[Info-vax] VMS defragmenters

[P. Sture]

In article <cbjdBON8e8f5 at eisner.encompasserve.org>,
 koehler at eisner.nospam.encompasserve.org (Bob Koehler) wrote:

>    I could never understand why IBM used absolute block addresses in
>    its ISAM, or why some MS-DOS DBMS vendors did the same.  VMS
>    keyed-indexed files don't.  C-ISAM and D-ISAM don't.
> 

Historical reasons? I recall from both ICL and IBM mainframe days that 
you specified the disk blocks files were places in.

Yes, you can specify placement for RMS files via FDL, but you lose the 
placement on a BACKUP/IMAGE operation, so I never used it on VMS.

-- 
Paul Sture