Re: Single level store & record blocking on update files (was RE:Where is IBM?)

[Douglas Handy <dhandy1@xxxxxxxxxxxxx>]

Dan,

>On the AS/400, there is no record blocking for update files, period.  I fail 
>to see why this is,
>especially in light of the AS/400's single level store.

I think this is only true when there is a unique access path, and the
suppression of record blocking is simply to force an immediate test for
duplicate keys.

Under SSP on the S/36, it could block them anyway and you didn't find out about
the duplicates until the keysort when the file was closed.  (Remember those
nasty messages?)

I believe the 400 can block record updates, provided the physical and associated
logicals do not have a unique access path.  In practice this means most files
cannot be blocked for update.

Doug