oracle exp 常見錯誤 EXP-00091

常見導出錯誤:
EXP-00091: Exporting questionable statistics.
Export terminated successfully with warnings.

語言環境問題
select value from nls_database_parameters t where t.parameter='NLS_CHARACTERSET';
VALUE
--------------------------------------------------------------------------------
ZHS16GBK

設定語言環境
export NLS_LANG='SIMPLIFIED CHINESE_CHINA.ZHS16GBK'