【Oracle】ORA-30553: 函數不確定的解決辦法

 如果需要創建基於自定義函數的索引,那麼我們需要指定deterministic參數，在函數建立的時候指定該參數問題可解決。

SQL> CREATE OR REPLACE FUNCTION f_xifenfei (itime DATE)

  2  RETURN DATE

  3  IS

  4  otime DATE;

  5  BEGIN

  6    otime:=NVL(itime,SYSDATE);

  7    RETURN otime;

  8  END;

  9  /

Function created.

--想採用自定義函數屏蔽掉sysdate在創建index時候的影響

SQL>  create index in_t_xifenfei on t_xifenfei (f_xifenfei(intime)) online nologging;

create index in_t_xifenfei on t_xifenfei (f_xifenfei(intime)) online nologging

                                           *

ERROR at line 1:

ORA-30553: The function is not deterministic

SQL> !oerr ora 30553

30553, 00000, "The function is not deterministic"

// *Cause:  The function on which the index is defined is not deterministic

// *Action: If the function is deterministic, mark it DETERMINISTIC.  If it

//          is not deterministic (it depends on package state, database state,

//          current time, or anything other than the function inputs) then

//          do not create the index.  The values returned by a deterministic

//          function should not change even when the function is rewritten or

//          recompiled.

--因爲函數缺少deterministic不能使用於index上

SQL> CREATE OR REPLACE FUNCTION f_xifenfei (itime DATE)

  2  RETURN DATE deterministic

  3  IS

  4  otime DATE;

  5  BEGIN

  6    otime:=NVL(itime,SYSDATE);

  7    RETURN otime;

  8  END;

  9  /

Function created.

SQL> create index in_t_xifenfei on t_xifenfei (f_xifenfei(intime)) online nologging;

Index created.

--創建函數index成功