The database export error report today: EXP-00091: Exporting questionable statistics. The EXP-00091: Exporting questionable statistics error was reported
during the exp backup and export of the ORACLE database: The details are as follows:
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics...
exporting table test 12 rows exported
EXP-00091: Exporting questionable statistics
... exporting table users 129 rows exported
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
Reason for the problem:
The reason for this problem is that the database character set and the operating system’s NLS_LANG are inconsistent.
Solution:
Query the character set information of the database
SQL> select userenv('language') from dual;
USERENV('LANGUAGE')
AMERICAN_AMERICA.WE8ISO8859P1
Set the NLS_LANG value of the operating system
export NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1
Re-run the database export command
exp system/oracle file='/tmp/full.dmp' full=y;