01 level in cobol takes more memory, Is it True?

etijain · New User Joined: 26 Nov 2005 Posts: 2

hi...i have heard that 01 level in cobol takes more memory and hence arrays cant be declared in 01 level.but it is not clear to me? how internally cobol stores all these levels information?

mmwife · Super Moderator Joined: 30 May 2003 Posts: 1592

I haven't seen it officially stated, but my guess about the restriction is that 01 levels are automatically aligned on double word boundaries, so when you "occurs" them the field definitions may not map properly for all occurances of the data.

rischith · New User Joined: 24 Feb 2006 Posts: 9 Location: bangalore

mmwife · Super Moderator Joined: 30 May 2003 Posts: 1592

Because an 01 level must be aligned on a doubleword boundary you can use upto 7 more bytes than using an 05 level, etc. for non-COMP fields.

Non 01 level, non-COMP fields don't have to be aligned.

etijain · New User Joined: 26 Nov 2005 Posts: 2

hi answer is not clear , can u elaborate more on this?

mmwife · Super Moderator Joined: 30 May 2003 Posts: 1592

Hi, what don't you understand?

Aditya Bhardwaj · Posted: Tue Aug 15, 2006 4:00 pm

As per my knowledge, 01 level is itself is an entity, and putting and Occurs on that entity leads to redefining that entity with other, which is not allowed.
Also, since we require to make occur happen on the fields of the table(logical in this case) and NOT the table itself, we make a new place for the same by making occur happen on the fields and not on the table as a whole.

Please correct me, in case.

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