标签：des style blog code http ext
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> 
ORA-02429: cannot drop index used for enforcement of unique /primary key,布布扣,bubuko.com
ORA-02429: cannot drop index used for enforcement of unique /primary key
标签：des style blog code http ext
原文地址：http://www.cnblogs.com/kerrycode/p/3797097.html
