Proc compilation in production

Question

HI Forum,
I have a stored proc which writes logs to server using utl/io utility . I need to compile this proc . But this proc is being used almost all the time and getting library cache pin wait event and hanging when i try to compile this proc , moreover it is also putting other jobs which are using this proc and takes minimal time in wait .
Is there any way I can compile this proc .
eg:
1) Job1 running (expected completion 2 days)
2)started comipling procedure -- going to library cache wait
3)job2 started (which usually takes 1 min ) -- going to library cache wait
So it is mostly effecting the jobs which takes minimal time .
select * from v$version
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
Thanks ,
Mahesh

Answer 1

Hi,
On Oracle 11.2 you can use edition-based redefinition.
Here is an example:
Connect as user test (session 1):
1  create or replace procedure test( x out number ) is
  2  begin
  3    dbms_lock.sleep( 30 );
  4    x := 1; --oryginal version
  5* end;
SQL> /
Procedure created.While test is still connected, connect as sys in another session and do:
SQL> connect sys as sysdba
Enter password:
Connected.
SQL> alter user test enable editions;
User altered.
SQL> create edition edition_one;
Edition created.
SQL> grant use on edition edition_one to public;
Grant succeeded.
SQL> alter database default edition = edition_one;
Database altered.Now connect as user test in another session (session 1 is still active),
and prepare a new version of the procedure - but don't compile it yet
SQL> create or replace procedure test( y out number ) is
  2  begin
  3    dbms_lock.sleep( 20 );
  4    y := 33;
  5  end;
  6  /In session 1 execute the procedure:
SQL> execute test( :x );and while it is running (30 seconds), in session 2 hit enter to compile a new procedure:
SQL> create or replace procedure test( y out number ) is
  2  begin
  3    dbms_lock.sleep( 20 );
  4    y := 33;
  5  end;
  6  /
Procedure created.
SQL> var yy number
SQL> call test( :yy )
  2  ;
Call completed.
SQL> print :yy
     YY
     33Session 1 is still using the old version of the procedure,
but after disconnecting and connecting again it will see the new version
SQL> execute test( :x );
PL/SQL procedure successfully completed.
SQL> print :x
      X
      1
SQL> connect test
Enter password:
Connected.
SQL> var x number
SQL> call test( :x )
  2  ;
Call completed.
SQL> print :x
      X
     33