EXP-00091 Exporting questionable statistics

I got ” EXP-00091 Exporting questionable statistics ”  error in Oracle database.

EXP-00091 Exporting questionable statistics

Details of error are as follows.

EXP-00091 Exporting questionable statistics

Cause: Export was able to export statistics, but the statistics may not be useable. 
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, or export complete tables.

Exporting questionable statistics

This EXP-00091 errors are related with the Export was able to export statistics, but the statistics may not be useable.
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 w

To export non-questionable statistics, change the client character set or NCHARSET to match the server, export with no query clause, or export complete tables.

You can execute exp command with “statistics=none” option to skip the statistics collection and bypass the error. For instance:

exp mehmet/deveci schemas=mehmet file=mehmet.dmp log=scott.log statistics=none

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