EXP-00091: Exporting questionable statistics

imp导入数据时报：

EXP-00091: Exporting questionable statistics.

EXP-00091: Exporting questionable statistics.

SQL>select * from nls_database_parameters;



NLS_CHARACTERSET AL32UTF8

SQL> select * from nls_instance_parameters ;

PARAMETER VALUE

------------------------------------------------------------ -----------------------------------------------------------------------

NLS_LANGUAGE SIMPLIFIED CHINESE

NLS_TERRITORY CHINA

PARAMETER VALUE

------------------------------------------------------------ -----------------------

NLS_LANGUAGE AMERICAN

NLS_TERRITORY AMERICA

imp/exp 前运行：

export NLS_LANG =american_america.AL32UTF8

NLS_LANG=american_america.ZHS16GBK

NLS_LANG=SIMPLIFIED CHINESE_CHINA.ZHS16GBK

[oracle@ora1 ~]$ exp \'/ as sysdba \'
file=a.dmp transport_tablespace=y tablespaces=users