CREATE OR REPLACE PACKAGE KRISHNA_PKG AS
  PROCEDURE MyProcedure;
END KRISHNA_PKG; 
/

CREATE OR REPLACE package body krishna_pkg is
procedure MyProcedure
as
begin

dbms_session.set_context( 'KRISHNA_CTX', 'SURNAME','Test');

end MyProcedure; 

end krishna_pkg; 
/