Difference between DELETE and CATALOG in DISP

umabsr · New User Joined: 08 Mar 2005 Posts: 6 Location: chennai

hi everybody,

i have a doubt regarding the DELETE AND CATALOG IN DISP, i read that DELETE will not delete the dataset phsically till it is written over, but uncatalogues the entry in system catalog.

and for CATALOG also the same thing.

please tell me the difference, if possible with an example

hope i will get the answer. thanq.......

machswap · New User Joined: 19 Apr 2005 Posts: 14

Hi,

Delete will delete the dataset physically.

Regards,

umabsr · New User Joined: 08 Mar 2005 Posts: 6 Location: chennai

hello sir,

u told that delete deletes the data set physically, i think it not so, please verify sir, i read that i just uncatalogues the entry in system catalog and don't deletes physically until it is written over.

please verify sir, and please give me the correct difference.

thanks,

priya · Posted: Fri Feb 15, 2008 8:04 pm

DELETE will not physically delete the dataset, unless the space occupied by the dataset is required for a new dataset.

enrico-sorichetti · Posted: Fri Feb 15, 2008 8:21 pm

Gentlemen please,
lets reach an agreement on the terminology

disp = catalog will...
create a catalog entry for a newly created/allocated datasets

disp = delete will...
1 - uncatalog the dataset from the catalog
2 - delete the dataset entry from the VTOC of the dasd volumes were the dataset resided

if the dataset was referred using the unit and vol parameters only action 2
will be performed, leaving behind an undesirable situation
( You will find a catalog entry for the dataset, but no dataset.. ugly isn' t it )

the two actions will happen at different times in the dataset life

as far as the physical term is concerned...
the bits of the dataset will conceptually still be there
but unreachable by common means

You might want to check for tools for data security erase of the unused part of a dataset after close
or the full extent at delete time