异定义异常就是那些在pl/sql中已经定义好并给予了异常名称的异常。它们全部放在pl/sql自带的标准包中，这样pl/sql程序员就无需再次定义。
Oracle中总共有如下21种标准预定义异常:
Oracle异常名称
错误号
说明
DUP_VAL_ON_INDEX
ORA-00001
You tried to execute an INSERT or UPDATE statement that has created a duplicate value in a field restricted by a unique index.试图破坏一个唯一性限制
TIMEOUT_ON_RESOURCE
ORA-00051
You were waiting for a resource and you timed out.在等待资源时发生超时
TRANSACTION_BACKED_OUT
ORA-00061
The remote portion of a transaction has rolled back.由于发生死锁事务被撤消
INVALID_CURSOR
ORA-01001
You tried to reference a cursor that does not yet exist. This may have happened because you’ve executed a FETCH cursor or CLOSE cursor before OPENing the cursor.试图使用一个未打开的游标
NOT_LOGGED_ON
ORA-01012
You tried to execute a call to Oracle before logging in.没有连接到ORACLE
LOGIN_DENIED
ORA-01017
You tried to log into Oracle with an invalid username/password combination.无效的用户名/口令
NO_DATA_FOUND
ORA-01403
SELECT INTO没有找到数据You tried one of the following:
You executed a SELECT INTO statement and no rows were returned.You referenced an uninitialized row in a table.You read past the end of file with the UTL_FILE package.TOO_MANY_ROWS
ORA-01422
SELECT INTO 返回多行You tried to execute a SELECT INTO statement and more than one row was returned.
ZERO_DIVIDE
ORA-01476
试图被零除You tried to divide a number by zero.
INVALID_NUMBER
ORA-01722
转换一个数字失败You tried to execute an SQL statement that tried to convert a string to a number, but it was unsuccessful.
STORAGE_ERROR
ORA-06500
内存不够或内存被破坏引发的内部错误You ran out of memory or memory was corrupted.
PROGRAM_ERROR
ORA-06501
内部错误,需重新安装数据字典视图和pl/sql包This is a generic “Contact Oracle support” message because an internal problem was encountered.
VALUE_ERROR
ORA-06502
赋值操作，变量长度不足，触发该异常You tried to perform an operation and there was a error on a conversion, truncation, or invalid constraining of numeric or character data.
ROWTYPE_MISMATCH
ORA-6504
宿主游标变量与 PL/SQL变量有不兼容行类型
CURSOR_ALREADY_OPEN
ORA-06511
试图打开一个已打开的游标You tried to open a cursor that is already open.
ACCESS_INTO_NULL
ORA-6530
试图为null 对象的属性赋值
COLLECTION_IS_NULL
ORA-6531
试图给没有初始化的嵌套表变量或者Varry变量赋值
SUBSCRIPT_OUTSIDE_LIMIT
ORA-6532
对嵌套或varray索引使用了负数
SUBSCRIPT_BEYOND_COUNT
ORA-6533
对嵌套或varray索引的引用大于集合中元素的个数