Modify a procedure while is being called

Question

can we modify a procedure while is being running. we have a procedure that is being called all the time (near real-time), can we modify this procedure while is being called?
Best Regards

Answer 1

+Your database administrator will have to prevent people from running it or...+
Wouldn't the DDL CREATE OR REPLACE PROCEDURE itself do this?
In other words the create or replace procedure DDL will "lock out" any later call to procedure and put them in "wait state". Is this not correct?
A small test show the following...
-- In SESSION 1
sudhakar@ORCL>CREATE OR REPLACE FUNCTION ST RETURN VARCHAR2
  2  IS
  3  L_EXP NUMBER;
  4  BEGIN
  5  SYS.DBMS_LOCK.SLEEP(10);
  6  RETURN 'AAAA';
  7  END ST;
  8  /
Function created.
sudhakar@ORCL>GRANT EXECUTE ON ST TO OE;
Grant succeeded.
sudhakar@ORCL>
-- In SESSION 2
oe@ORCL>SELECT SUDHAKAR.ST C1, TO_CHAR(SYSDATE,'HH24:MI:SS') C2 from dual;
-- In SESSION 1 while session 2 is running...
sudhakar@ORCL>CREATE OR REPLACE FUNCTION ST RETURN VARCHAR2
  2  IS
  3  L_EXP NUMBER;
  4  BEGIN
  5  SYS.DBMS_LOCK.SLEEP(10);
  6  RETURN 'BBBB';
  7  END ST;
  8  /
-- It goes into WAIT State...
-- In SESSION 3 (while the other two sessions are waiting...
oe@ORCL>SELECT SUDHAKAR.ST C1, TO_CHAR(SYSDATE,'HH24:MI:SS') C2 from dual;
--This goes on wait state...
-- Once session 2 and session 1 complete
-- session 2 returns with...
C1   C2
AAAA 21:29:37
oe@ORCL>
-- session 3 returns with...
C1   C2
BBBB 21:31:07
oe@ORCL>vr,
Sudhakar B.