Oracle 11g对依赖的推断达到字段级

     在Oracle 10g下，推断依赖性仅仅达到了对象级。也就是说存储过程訪问的对象一旦发生了变化。那么Oracle就会将存储过程置为INVALID状态。所以在为表做了DDL操作后。须要把存储过程又一次进行编译。

       在Oracle 11g下，对依赖的推断更加细化，推断到了字段级。尽管有这么好的特性。但我还是建议对表做了DDL操作后，把存储过程再又一次编译一下。

Oracle 10g下：

SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for 64-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
SQL> drop table TEST purge;
SQL> drop PROCEDURE P_TEST;
SQL> CREATE TABLE TEST(ID NUMBER);
SQL> CREATE OR REPLACE PROCEDURE P_TEST AS
      BEGIN
        INSERT INTO TEST (ID) VALUES (100);
      END;
      /
SQL> col OBJECT_NAME format a10;
SQL> col OBJECT_TYPE format a10;
SQL> col STATUS format a10;
SQL> SELECT OBJECT_NAME, OBJECT_TYPE, STATUS FROM USER_OBJECTS WHERE OBJECT_NAME = 'P_TEST';
OBJECT_NAM OBJECT_TYP STATUS
---------- ---------- ----------
P_TEST     PROCEDURE  VALID
SQL> ALTER TABLE TEST ADD (NAME VARCHAR2(30));
SQL> SELECT OBJECT_NAME, OBJECT_TYPE, STATUS FROM USER_OBJECTS WHERE OBJECT_NAME = 'P_TEST';
OBJECT_NAM OBJECT_TYP STATUS
---------- ---------- ----------
P_TEST     PROCEDURE  INVALID

Oracle 11g下：
SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
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

SQL> drop table TEST purge;
SQL> drop PROCEDURE P_TEST;
SQL> CREATE TABLE TEST(ID NUMBER);
SQL> CREATE OR REPLACE PROCEDURE P_TEST AS
      BEGIN
        INSERT INTO TEST (ID) VALUES (100);
      END;
      /

SQL> col OBJECT_NAME format a10;
SQL> col OBJECT_TYPE format a10;
SQL> col STATUS format a10;
SQL> SELECT OBJECT_NAME, OBJECT_TYPE, STATUS FROM USER_OBJECTS WHERE OBJECT_NAME = 'P_TEST';
OBJECT_NAM OBJECT_TYP STATUS
---------- ---------- ----------
P_TEST     PROCEDURE  VALID
SQL> ALTER TABLE TEST ADD (NAME VARCHAR2(30));
SQL> SELECT OBJECT_NAME, OBJECT_TYPE, STATUS FROM USER_OBJECTS WHERE OBJECT_NAME = 'P_TEST';
OBJECT_NAM OBJECT_TYP STATUS
---------- ---------- ----------
P_TEST     PROCEDURE  VALID