thank you for your answer....
... so if I understand correctly - the end result in worst case scenario could be bad performance ?
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export import Oracle warnings
Hi, i have exported oracle schema with:
exp system/password file=filename.dmp owner=schema
The export completed successfully with warnings. The warnings were:
Exporting questionable statistics.
I`ve heard that when importing I need to rebuild indexes in order for things to work properly.
Is this true and how can I do that ?
thank you
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Answers
Actually the usual reason for that error is exporting with a different character set than the db character set. Review the export message and compare the db charset to the clientcharset. Set the NLS_LANG environment variable accordingly to match, and the error will go away.
Or you can switch to using data pump (expdp) which ignores the client charset and uses the db charset.
Since this question is really two questions, I'm focusing on this part:
>>The export completed successfully with warnings. The warnings were:
>>Exporting questionable statistics.
This is critical! It indicates you need to export in the correct character set. While the statistics can be regenerated on the target database, data cannot. Charset conversion during export/import can corrupt your data if the charsets are not compatible. So you need to make sure you are exporting in the right character set in the first place, or move to data pump.
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by: turnbulldPosted on 2009-07-31 at 04:08:35ID: 24987689
I've never had to rebuild indexes after an import. It will likely be a good idea for you to re-analyze your objects however. The warning is an indicator that the statistics the database keeps on the data objects are not reliable. It uses this information to formulate the best plan for returning query results. Bad statistics can result in poor performance. Reference the ANALYZE statement in the Oracle SQL guide and Oracle Concepts manual for more information on that function.