Tables without locks

Hi
I understand that somehow I would have to create locks to avoid table collision when updating tables by several users. What happens if I don't do that, meaning while one user is writing and updating a table and another is do in the same to the same table? Will the program give a runtime error? Are all the users running the program will run into the runtime error?
Thanks,
RT

Hi Rob,
This is done to aviod any inconsistency while accessing the database.
Well locking the table ensures the basic ACID properties of the DB.
A--> Atomicity
C--> Consistency
I--> Isolation
D--> Durabilty
Trying to update the database table at the same time might result into inconsistency.
DB_SQL_ERROR runtime might be issued.
Never seen it personally though!
Also refer to
http://help.sap.com/saphelp_nw04s/helpdata/en/41/7af4c5a79e11d1950f0000e82de14a/content.htm
Hope that helps!
Regards,
Tanveer.
<b>Please mark helpful answers</b>

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Sid wrote:>
> Hi everybody,
>
> i get the following error after activation:
>
> "ITAB" is a table without a header line and therefore has no component called "NUM"..
>
> How can i solve this problem?
>
>
>   TYPES: BEGIN OF i_itab,
>            NUM TYPE I,
>          END OF i_itab.
>
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>
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>
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>
>   ENDLOOP.
>
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