相信不少人遇到过ORA-02429: cannot drop index used for
enforcement of unique /primary key 这个错误,对应的中文提示“ORA-02429: 无法删除用于强制唯一/主键的索引”,其实从错误提示信息已经很明显了。下面还是用一个简单的例子述说一下该错误的来龙去脉。
ORA-02429错误的原因是因为用户试图删除一个用于强制唯一/主键的索引,解决方法也很简单,删除对应的约束就会自动删除该索引。
[oracle@DB-Server
~]$ oerr ora 2429
02429,
00000, "cannot drop index used for enforcement of unique/primary key"
//
*Cause: user attempted to drop an index that is being used as the
//
enforcement mechanism for unique or primary key.
//
*Action: drop the constraint instead of the index.
1:新建测试表TAB_TEST, 如下所示:
CREATE TABLE TAB_TEST( JOB_ORDER_NO VARCHAR2(20 BYTE), DIMM_ID NUMBER, MRP_GROUP_CD VARCHAR2(10 BYTE), ITEM_CAT VARCHAR2(20 BYTE), REQUIRED_DATE DATE, PURCHASED_BY VARCHAR2(10 BYTE), USED_BY VARCHAR2(10 BYTE), SUPPLIER_CD VARCHAR2(10 BYTE))
2:添加主键约束,如下所示
ALTER TABLE TAB_TEST ADD CONSTRAINT PK_TAB_TEST PRIMARY KEY (JOB_ORDER_NO, DIMM_ID, MRP_GROUP_CD, ITEM_CAT);
3:查看测试表的索引信息
SQL> SELECT INDEX_NAME FROM DBA_INDEXES WHERE TABLE_NAME='TAB_TEST'; INDEX_NAME------------------------------PK_TAB_TEST
4:查看测试表的约束信息:
SQL> SELECT CONSTRAINT_NAME FROM DBA_CONSTRAINTS WHERE TABLE_NAME='TAB_TEST'; CONSTRAINT_NAME------------------------------PK_TAB_TEST
5:删除测试表的索引PK_TAB_TEST
SQL> DROP INDEX PK_TAB_TEST;
DROP INDEX PK_TAB_TEST
*
ERROR at line 1:
ORA-02429: cannot drop index used for enforcement of unique/primary key
解决方法:
删除对应的约束就会自动删除该索引。而不是直接去删除该索引。很多菜鸟就会直接这样做!
SQL> ALTER TABLE TAB_TEST DROP CONSTRAINT PK_TAB_TEST;
Table altered.
SQL> SELECT CONSTRAINT_NAME FROM DBA_CONSTRAINTS WHERE TABLE_NAME='CONSTRAINT_NAME';
no rows selected
SQL> SELECT INDEX_NAME FROM DBA_INDEXES WHERE TABLE_NAME='TAB_TEST';
no rows selected
SQL>
该贴被潇湘隐者编辑于2014-6-20 22:58:09该贴由hui.chen转至本版2014-11-5 16:24:16