本文通过示例详细解释了Oracle EXP在导出数据时遇到的EXP-00091错误，该错误与nls_lang参数设置不正确有关。解决方案包括调整nls_lang至正确值、设置statistics=none或使用Data Pump工具。了解这些参数和错误的含义对于DBA进行数据备份至关重要。
首先，我们先查看一下正常的Exp导出过程。
C:\Users\admin>set nls_lang=american_america.al32utf8
C:\Users\admin>exp \"/ as sysdba\" owner=scott file=scott.dmp
Export: Release 11.2.0.4.0 - Production on Sat Jul 26 19:34:55 2014
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit
Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in AL32UTF8 character set and AL16UTF16 NCHAR character set
About to export specified users ...
. exporting pre-schema procedural objects and actions
. exporting foreign function library names for user SCOTT
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting object type definitions for user SCOTT
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