（1）什么是oerr
oerr是Oracle提供的在UNIX/Linux上查看Oracle错误的小工具，使用起来非常方便。
（2）如何使用
oerr工具位于ORACLE_HOME下面，可以使用which查看
[oracle@redhat6 ~]$ which oerr
/u01/app/oracle/product/11.2.0/db_1/bin/oerr
使用oerr查看Oracle的报错信息及解决方案
例子1、使用oerr查看ORA-00060错误的原因及解决方案
[oracle@redhat6 ~]$ oerr ora 60
00060, 00000, "deadlock detected while waiting for resource"
// *Cause : Transactions deadlocked one another while waiting for resources.
// *Action: Look at the trace file to see the transactions and resources
// involved. Retry if necessary.
例子2、使用oerr查看ORA-01502错误的原因及解决方案
[oracle@redhat6 ~]$ oerr ora 01502
01502, 00000, "index '%s.%s' or partition of such index is in unusable state"
// MERGE: 1489 RENUMBERED TO 1502
// *Cause: An attempt has been made to access an index or index partition
// that has been marked unusable by a direct load or by a DDL
// operation
// *Action: DROP the specified index, or REBUILD the specified index, or
// REBUILD the unusable index partition