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          EXP--解決EXP-00091的方法

          Posted on 2007-02-05 11:41 zolly 閱讀(912) 評論(0)  編輯  收藏
          對一個DBA或需使用exp,imp的普通用戶來說,在我們做exp的過程中可能經常會遇到EXP-00091 Exporting questionable statistics.這樣的EXP信息,其實它就是exp的error message,它產生的原因是因為我們exp工具所在的環境變量中的NLS_LANG與DB中的NLS_CHARACTERSET不 一致。但需說明的是,exp-91這個error message對所生成的dump檔沒有影響,生成的dump檔還可以正常的imp(個人體會,不知道有沒有錯),雖然它對我們的dump檔沒有影響,我 個人還是不想它出現,大家也有同感吧, 。。下面我們就讓它消失吧。。我們一起來

          step 01 查看DB中的NLS_CHARACTERSET的值(提供兩種方法):


          select * from nls_database_parameters t where t.parameter='NLS_CHARACTERSET'
          or
          select * from v$nls_parameters? where parameter='NLS_CHARACTERSET';
          SQL> select * from v$nls_parameters where parameter='NLS_CHARACTERSET';

          PARAMETER    ????? VALUE
          -----------------------  ----------------------------------------------
          NLS_CHARACTERSET??? ZHT16BIG5

          step 02 根據step 01查出的NLS_CHARACTERSET(ZHT16BIG5)來設定exp的環境變量:


          WINNT> set NLS_LANG=AMERICAN_AMERICA.ZHT16BIG5
          LINUX> export NLS_LANG=AMERICAN_AMERICA.ZHT16BIG5

          附上exp-91的oracle error message 解決方案說明:

          ?oerr exp 91
          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.

          From: http://vongates.itpub.net/post/2553/18625

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