Tag Archives: existing state of packages has been discarded

How to solve ORA-4068

I was amazed by this oneliner in stackoverflow.

First, let me introduce you my old foe, ORA-04068 :
Session 1:

SQL> CREATE OR REPLACE PACKAGE P AS 
  2  X NUMBER;Y NUMBER;END;
  3  /

Package created.

SQL> exec P.X := 1

PL/SQL procedure successfully completed.

Session 2:

SQL> CREATE OR REPLACE PACKAGE P AS 
  2  X NUMBER;Z NUMBER;END;
  3  /

Package created.

Session 1:

SQL> exec P.X := 2
BEGIN P.X := 2; END;

*
ERROR at line 1:
ORA-04068: existing state of packages has been discarded
ORA-04061: existing state of package "SCOTT.P" has been invalidated
ORA-04065: not executed, altered or dropped package "SCOTT.P"
ORA-06508: PL/SQL: could not find program unit being called: "SCOTT.P"
ORA-06512: at line 1

Changing the package in session 2 did invalidate the package variable in session 1.

And the PRAGMA that saves the world : PRAGMA SERIALLY_REUSABLE

Session 1:

SQL> CREATE OR REPLACE PACKAGE P AS 
  2  PRAGMA SERIALLY_REUSABLE;X NUMBER;Y NUMBER;END;
  3  /

Package created.

SQL> exec P.X := 1

PL/SQL procedure successfully completed.

Session 2:

SQL> CREATE OR REPLACE PACKAGE P AS 
  3  PRAGMA SERIALLY_REUSABLE;X NUMBER;Z NUMBER;END;
  2  /

Package created.

Session 1:

SQL> exec P.X := 2

PL/SQL procedure successfully completed.

Oh yes!