用exp导出时报错：
EXP-00091: Exporting questionable statistics.
. . exporting table FF 2 rows exported

查看EXP-00091的oracle error message 解决方案说明：

[oracle@payne ~]$ oerr exp 00091
00091, 00000, "Exporting questionable statistics."
// *Cause: Export was able export statistics, but the statistics may not be
//          usuable. The statistics are questionable because one or more of
//          the following happened during export: a row error occurred, client
//          character set or NCHARSET does not match with the server, a query
//          clause was specified on export, only certain partitions or
//          subpartitions were exported, or a fatal error occurred while
//          processing a table.
// *Action: To export non-questionable statistics, change the client character
//          set or NCHARSET to match the server, export with no query clause,
//          export complete tables. If desired, import parameters can be
//          supplied so that only non-questionable statistics will be imported,
//          and all questionable statistics will be recalculated.
exp工具所在客户端的环境变量中的NLS_LANG与数据库中的NLS_CHARACTERSET不一致。
查看数据库的字符集：
SQL> select * from nls_database_parameters where parameter like'NLS_CH%';

PARAMETER VALUE
------------------------------ ----------------------------------------
NLS_CHARACTERSET AL32UTF8
查看客户端字符集：
[oracle@payne ~]$ echo $NLS_LANG

AMERICAN_AMERICA.ZHS16CGB231280

设置环境变量的字符集：
  [oracle@payne ~]$ export NLS_LANG=AMERICAN_AMERICA.AL32UTF8

再用EXP工具导出，问题解决。

ITPub博客

exp-00091

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