PRAGMA_SERIALLY_REUSABLE

PRAGMA_SERIALLY_REUSABLE: Package vars default value ll be reset at every call in a session if u use this pragma in the pkg. else it wont.

Example of Serially Reusable Packages :How Package Variables Act Across Call Boundaries

This example has a serially reusable package specification (there is no body).

CONNECT Scott/Tiger
CREATE OR REPLACE PACKAGE Sr_pkg IS
  PRAGMA SERIALLY_REUSABLE;
  N NUMBER := 5;                -- default initialization
END Sr_pkg;

Suppose your Enterprise Manager (or SQL*Plus) application issues the following:
CONNECT Scott/Tiger

# first CALL to server
BEGIN
   Sr_pkg.N := 10;
END;

# second CALL to server
BEGIN
   DBMS_OUTPUT.PUT_LINE(Sr_pkg.N);
END;

This program prints:
5

Note:  If the package had not had the pragma SERIALLY_REUSABLE, the program would have printed '10'.