在linux 使用exp导出备份数据时提示EXP-00091: Exporting questionable statistics.

在linux 使用exp导出备份数据时提示：
EXP-00091: Exporting questionable statistics.
1.问题产生的原因
linux下oracle用户环境变量语言集和oracle数据库中的环境变量语言集不同
2.解决方法
只要将oracle环境变量语言集改成和数据库环境变量语言集一样的就可以
查看服务端字符集

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select * from nls_database_parameters t where t.parameter='NLS_CHARACTERSET'

or

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select * from v$nls_parameters where parameter='NLS_CHARACTERSET';
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[oracle@rac01 ~]$ export NLS_LANG=AMERICAN_AMERICA.ZHS16GBK
[oracle@rac01 ~]$ exp tuser/****** tables=UCM_BOARDWS_INSTALLWORK,UCM_BOARDWS_APINSTALL file=/orabak/1015installworkBak.dmp log=/orabak/1015installworkBak.log

Export: Release 11.2.0.3.0 - Production on Wed Oct 15 10:05:16 2014

Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Tes
Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set

About to export specified tables via Conventional Path ...
. . exporting table UCM_BOARDWS_INSTALLWORK 1998871 rows exported
. . exporting table UCM_BOARDWS_APINSTALL 2190269 rows exported
Export terminated successfully without warnings.