又见Oracle BUG:Rman备份的alert错误提示
现象：
在执行数据库备份时，alert日志提示存在错误信息，并给出了一个详细错误信息的trc文件。

alert.log
<<====
Tue May 7 10:23:19 2013
Errors in file /opt/oracle/admin/MMS/udump/MMS_ora_9140.trc:
Tue May 7 10:23:19 2013
Errors in file /opt/oracle/admin/MMS/udump/MMS_ora_9140.trc:
Tue May 7 10:23:19 2013
Errors in file /opt/oracle/admin/MMS/udump/MMS_ora_9140.trc:
<<====

但trc文件没有异常信息：
[oracle@MMSDB admin]$ more /opt/oracle/admin/MMS/udump/MMS_ora_9140.trc
/opt/oracle/admin/MMS/udump/MMS_ora_9140.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /opt/oracle/product/10.2.0/db_1
System name: Linux
Node name: MMSDBZ
Release: 2.6.18-194.el5
Version: #1 SMP Tue Mar 16 21:52:39 EDT 2010
Machine: x86_64
Instance name: MMS
Redo thread mounted by this instance: 1
Oracle process number: 86
Unix process pid: 9140, image: oracleMMS@MMSDBZ

*** 2013-05-07 10:23:19.906
*** ACTION NAME:(0000089 STARTED16) 2013-05-07 10:23:19.873
*** MODULE NAME:(backup full datafile) 2013-05-07 10:23:19.873
*** SERVICE NAME:(MMS) 2013-05-07 10:23:19.873
*** SESSION ID:(891.56220) 2013-05-07 10:23:19.873
*** ACTION NAME:(0000093 STARTED111) 2013-05-07 10:23:24.597
[oracle@MMSDB admin]$

分析：
1.确认alert错误提示发生在执行备份时；
MMS_ora_9140.trc：
*** MODULE NAME:(backup full datafile) 2013-05-07 10:23:19.873
2.trc文件是否被截断？
3.是否是Oracle本身存在BUG。

对于1，查看了备份脚本和rman日志，确认备份脚本设置正确，无异常rman日志。排除1
对于2，查看了max_dump_file_size参数设置：
SQL> show parameter max_dump_file_size
NAME TYPE VALUE
------------------------------------ -------------------------------- ------------------------------
max_dump_file_size string UNLIMITED   <===设置没问题
查看操作系统空间也是有的。
对于3，在Metalink查找，发现有BUG存在。
Trace File Created when RMAN issues the Controlfile Autobackup [ID 335731.1]

Applied to:
Oracle Database - Enterprise Edition - Version 10.1.0.2 to 10.2.0.1 [Release 10.1 to 10.2]  <====我们的DB版本为10.2.0.1
Information in this document applies to any platform.
***Checked for relevance on 03-Apr-2013***

Symptoms:
Error in Alert.log on controlfile autobackup and trace file created with RMAN backups.

Issue verified by alert.log showing error:
Errors in file /usr/oracle/product/admin/dbtest/udump/dbtest_ora_8477.trc:
Control autobackup written to DISK device
handle '/orabackup/backup/prod/c-959859059-20050906-01'

And trace file created with:

/usr/oracle/product/admin/dbtest/udump/dbtest_ora_8477.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /usr/oracle/product/10.2
System name: Linux
Node name: dbtest
Release: 2.6.9-11.ELsmp
Version: #1 SMP Fri May 20 18:26:27 EDT 2005
Machine: i686
Instance name: dbtest
Redo thread mounted by this instance: 1
Oracle process number: 26
Unix process pid: 8477, image: oracle@dbtest (TNS V1-V3)

*** 2005-09-06 11:22:02.425
*** ACTION NAME:(0000064 STARTED111) 2005-09-06 11:22:02.403
*** MODULE NAME:(backup full datafile) 2005-09-06 11:22:02.403
*** SERVICE NAME:(SYS$USERS) 2005-09-06 11:22:02.403
*** SESSION ID:(538.56240) 2005-09-06 11:22:02.403
*** 2005-09-06 11:27:00.173
*** ACTION NAME:(0000670 STARTED111) 2005-09-06 11:27:00.173
*** MODULE NAME:(backup archivelog) 2005-09-06 11:27:00.173
Cause:
Bug 4596065.  Development determined these empty trace files are created upon controlfile autobackup when flash recovery area is enabled.
Solution:
To implement the solution, please execute the following steps:
1. Ignore the trace files until patch can b