manage a simultaneous situation in an update

Dear All; What is the best way to handle a simultaneous situation in a simple as update this procedure below
procedure update_definition(up_num in varchar2, up_definition in varchar2, up_quantity in number) 
  
As 
Begin

update table_one tq
set tq.definition = up_definition
and tq.quantity = up_quantity
where tq.p_number = up_num;
commit;
end update_definition;
I search the web and asktom and I got a little confused and lost.

It already handles simultaneous situations.
I maintain (still) a survey application 9.2 database with 20 + users daily from 5 countries and 150 + dbms_jobs runs every minute. Never had any problems with regard to the lock, unless (as said) we decided to replace the locking mechanism (it was 2006)... It still works fine (although not supported now ;)).
I'm sorry, unless you have a unit test that illustrates what you think could go wrong, I can't say anything else...

Oracle 9.2 documentation can be found here:
http://www.Oracle.com/pls/db92/db92.homepage
Read about locking and concurrency.

Tags: Database

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