DBA在一些場合下,要對無效的資料庫物件進行重新編譯.如果只是對all_objects等檢視中選出來的無效物件進行重新編譯,可能需要很多次:因為各個物件之間有依賴性的.這樣並不是一個很好的辦法.Raymond 在Recompiling invalid objects提到了如何有效地重新編譯無效物件.提到了三種比較有效地方法(

利用$ORACLE_HOME/rdbms/admin下的utlrp.sql指令碼編譯.一般都是在遷移或者升級之後執行該指令碼.Raymond說該方法的不足之處在於這個指令碼是對整個資料庫中的物件進行重新編譯的,所以不可取.有網友指出utlrp.sql 實際上是呼叫utlrcmp.sql的這樣就可以用utl_recomp包來做嘍(這樣就是比較好的方法).
用DBMS_UTILITY包來進行編譯.但是也有一定的侷限性.
Raymond 提到了自己的解決辦法: 不過也立刻有人指出來,這樣對 View 的重新編譯是無能為力的(ALTER_COMPILE只能處理:PACKAGE, PACKAGE BODY, PROCEDURE, FUNCTION, TRIGGER).參見下面的指令碼

CREATE OR REPLACE PROCEDURE RECOMPILE_SCHEMA
IS
  v_Type USER_OBJECTS.OBJECT_TYPE%TYPE;
  v_Name USER_OBJECTS.OBJECT_NAME%TYPE;
  v_Stat USER_OBJECTS.STATUS%TYPE;

  CURSOR c_Obj
  IS
    SELECT  BASE
    FROM  (SELECT A.OBJECT_ID BASE
           ,      B.OBJECT_ID REL
           FROM   USER_OBJECTS A
              ,      USER_OBJECTS B
              ,      SYS.DEPENDENCY$  C
           WHERE  A.OBJECT_ID = C.D_OBJ#
           AND    B.OBJECT_ID = C.P_OBJ#
           AND    A.OBJECT_TYPE IN ('PACKAGE',
                                    'PROCEDURE',
                                    'FUNCTION',
                                    'PACKAGE BODY',
                                  --  'VIEW', 
                                    'TRIGGER')
           AND    B.OBJECT_TYPE IN ('PACKAGE',
                                    'PROCEDURE',
                                    'FUNCTION',
                                    'PACKAGE BODY',
                                  --  'VIEW', 
                                    'TRIGGER')
            AND    NOT A.OBJECT_NAME = B.OBJECT_NAME) OBJECTS
    CONNECT BY BASE = PRIOR REL
    GROUP   BY BASE
    ORDER   BY MAX(LEVEL) DESC;
BEGIN
  -- loop through all objects in order of dependancy.
  FOR c_Row IN c_Obj
  LOOP
    -- select the objects attributes (type, name & status).
    SELECT OBJECT_TYPE
    ,      OBJECT_NAME
    ,      STATUS
    INTO   v_Type
    ,      v_Name
    ,      v_Stat
    FROM   USER_OBJECTS
    WHERE  OBJECT_ID = c_Row.BASE;

    -- if the OBJECT is INVALID, recompile it.
    IF v_Stat = 'INVALID' THEN
      DBMS_DDL.ALTER_COMPILE(v_Type, USER, v_Name);
    END IF;
  END LOOP;

  -- Recompile all remaining INVALID OBJECTS (all those without dependencies).
  FOR c_Row IN ( SELECT OBJECT_TYPE
             ,      OBJECT_NAME
             FROM   USER_OBJECTS
             WHERE  STATUS = 'INVALID'
             AND    OBJECT_TYPE IN ('PACKAGE',
                                    'PROCEDURE',
                                    'FUNCTION',
                                    'TRIGGER',
                                    'PACKAGE BODY',
                                 --   'VIEW', 
                                    'TRIGGER') )
  LOOP
    DBMS_DDL.ALTER_COMPILE(c_Row.OBJECT_TYPE, USER, c_Row.OBJECT_NAME);
  END LOOP;
END RECOMPILE_SCHEMA;

Rem   EXAMPLES
Rem      1. Recompile all objects sequentially:
Rem             execute utl_recomp.recomp_serial();
Rem
Rem      2. Recompile objects in schema SCOTT sequentially:
Rem             execute utl_recomp.recomp_serial('SCOTT');
Rem
Rem      3. Recompile all objects using 4 parallel threads:
Rem             execute utl_recomp.recomp_parallel(4);
Rem
Rem      4. Recompile objects in schema JOE using the number of threads
Rem         specified in the paramter JOB_QUEUE_PROCESSES:
Rem             execute utl_recomp.recomp_parallel(NULL, 'JOE');
Rem
Rem      5. Recompile all objects using 2 parallel threads, but allow
Rem         other applications to use the job queue concurrently:
Rem             execute utl_recomp.recomp_parallel(2, NULL,
Rem                                                utl_recomp.share_job_queue);
Rem
Rem      6. Restore the job queue after a failure in recomp_parallel:
Rem             execute utl_recomp.restore_job_queue();

呼叫 utl_recomp 包是比較好的做法.需要 sys 許可權.[@more@]

重編譯 invalid 物件

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