find objects under a specific tablespace

[Ying Lu <ying_lu@xxxxxxxxxxxxxxx>]

Greetings,

I'd like to know how to check whether a specific object is created under 
a specific *tablespace*? How to find all objects under a specific 
tablespace?

For example, one index named "idx_test1" has been created. Now I'd like 
to check which tablespace does this index belong to?

Thanks a lot,
Emi

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