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EXP-00091 Exporting questionable statistics tips
Oracle Database Tips by Donald Burleson |
The "EXP-00091 Exporting questionable
statistics" error happens when you export table data with its
related optimizer statistics, and Oracle cannot verify the currency
of these statistics. When CBO statistics are created/updated with
dbms_stats, the time is noted, but it's always a good idea not to
export statistics since they should be recalculated after import.
You can remove the EXP-00091 error by exporting
with "statistics="none" or by setting the client character set
(e.g.
export NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1).
The Oracle docs note this on the EXP-00091
error:
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.
If desired, import parameters can be supplied so
that only
non-questionable statistics will be imported, and all questionable
statistics will be recalculated.
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