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  Use exp exported EXP-00091 error
  Add Date : 2017-08-31      
  Use the following command to perform the export:

exp user / pwd @ db file = / home / a.dmp log = / home / a.log

Output the following information, which contains some of the error messages EXP-00091:

.. Exporting table T 0 rows exported
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.

But guided by the dump file can be used to import.

Look for the official introduction of the EXP-00091:

EXP-00091: 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.

Roughly meaning the export process, because the character set or the client and server side NCHARSET parameters inconsistent, resulting in some of the statistical information is not available. The solution is not a problem you can export statistics, or change the character set or the client NCHARSET parameters.

plan 1:
Query server-side character set:

SQL> select userenv ( 'language') from dual; USERENV ( 'LANGUAGE')

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


Set the client character set:

[Oracle @ Node] ~> export NLS_LANG = AMERICAN_AMERICA.AL32UTF8

The export command:

[Oracle @ Node] ~> exp user / pwd @ db file = / home / a.dmp log = / home / a.log

.. Exporting table T 0 rows exported

No longer being given.

Scenario 2:

exp user / pwd @ db file = / home / a.dmp log = / home / a.log statistics = none

Statistics statistics information field is set to none.
The export command:

[Oracle @ Node] ~> exp user / pwd @ db file = / home / a.dmp log = / home / a.log

.. Exporting table T 0 rows exported

No longer being given. But in this way corresponds to those who did not export character set is inconsistent error statistics, this part will not have to import natural statistical information, if needed, you can only re-gather the statistics.

So for this exp EXP-00091 error message, you can have both ways workaround, but certainly still recommend Option 1, the most comprehensive export information.
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