Regarding stats collection in oracle 11g.

Just a general question, while doing stats collection weather system takes the backup of current statistics. i think we can specify stattab. but weather it takes stats backup before over writing?
I got this requirement as a part of upgrade, i have already gone through export_schema_stats and import_schema stats already.  Just trying all other possible options only...
Regards
DBA.

DBA wrote:
Just a general question, while doing stats collection weather system takes the backup of current statistics. i think we can specify stattab. but weather it takes stats backup before over writing?
backup to where exactly?

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