测试环境数据泵备份突然报这莫名其妙的错误，怎么引发的原因不详，只能见招拆招先解决问题了。
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
Starting "SYS"."SYS_EXPORT_SCHEMA_04": "/******** AS SYSDBA" ESTIMATE_ONLY=y schemas=GAMEX1125 ESTIMATE=statistics
Estimate in progress using STATISTICS method...
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.CONFIGURE_METADATA_UNLOAD [ESTIMATE_PHASE]
ORA-04063: package body "SYS.DBMS_METADATA" has errors
ORA-06508: PL/SQL: could not find program unit being called: "SYS.DBMS_METADATA"
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPW$WORKER", line 9001
----- PL/SQL Call Stack -----
object line object
handle number name
0x44865a0a8 20462 package body SYS.KUPW$WORKER
0x44865a0a8 9028 package body SYS.KUPW$WORKER
0x44865a0a8 6814 package body SYS.KUPW$WORKER
0x44865a0a8 13688 package body SYS.KUPW$WORKER
0x44865a0a8 4633 package body SYS.KUPW$WORKER
0x44865a0a8 9753 package body SYS.KUPW$WORKER
0x44865a0a8 1775 package body SYS.KUPW$WORKER
0x41dc261f0 2 anonymous block
Job "SYS"."SYS_EXPORT_SCHEMA_04" stopped due to fatal error at 13:23:12
alter package body DBMS_METADATA compile;
看到ORA-04063的错误，尝试去手动编译，看有没有报错
SQL> alter package SYS.DBMS_METADATA compile body;
If there are errors,
SQL> show errors;
发现确实有错误，有PLS-00905这样的错误，错误日志漏发了。
解决方法：
1、首先尝试去编译这个包:
SQL> alter package SYS.DBMS_METADATA compile package;
SQL> alter package SYS.DBMS_METADATA compile body;
2、如果上述报错，尝试下面的方法：
SQL> shutdown immediate;
SQL> startup upgrade;
SQL> @$ORACLE_HOME/rdbms/admin/catalog.sql;//执行这个脚本后，创建数据库的统计视图，审计视图
SQL> @$ORACLE_HOME/rdbms/admin/catproc.sql;//数据库具有pl/sql的使用功能
SQL> @$ORACLE_HOME/rdbms/admin/utlrp.sql;//编译数据库中的失效对象utlrp.sql
SQL> shutdown immediate;
SQL> startup;
再执行导出语句。