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前面提到，Oracle10g重建Procedure的处理有所增强，最初看到这个增强的时候，我想这个增强是否可以减少困扰已久的Library Cache的竞争呢？

我们看一下以下测试，首先在第一个session执行操作：


SQL> create or replace PROCEDURE pining
2 IS
3 BEGIN
4 NULL;
5 END;
6 /

Procedure created.

SQL>
SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';

Session altered.

SQL> create or replace procedure calling
2 is
3 begin
4 pining;
5 dbms_lock.sleep(60);
6 end;
7 /

Procedure created.

SQL>
SQL> col object_name for a30
SQL> select object_name,last_ddl_time from dba_objects where object_name in ('PINING','CALLING');

OBJECT_NAME LAST_DDL_TIME
------------------------------ -------------------
CALLING 2007-04-02 09:12:57
PINING 2007-04-02 09:12:57

SQL>
SQL> exec calling;