Is there a way to tell if anyone is reading from the rollback segments?  

I would like to manually issue 'alter rollback segment XXX shrink;', but do not want 
to do so if there are users reading read consistent data from the rollback space (thus 
giving them the ORA-01555 error). 

Is there a way to check if the rollback segment is in use first?

Can I try to take it offline?  Will it fail if there is someone reading from it?



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Author: Glenn Travis
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