Index on which tablespace

Question

How to find out which 'tablespace' a particular 'index' belongs to. (oracle) (need to use it via jdbc)

Answer 1

The information is in the ALL_INDEXES (or USER_INDEXES) view:

select tablespace_name
from all_indexes
where owner = 'MYSCHEMA'
and index_name = 'MYINDEX';

Answer 2

user_indexes.tablespace_name is null for partitioned indices.

Viewing Information About Partitioned Tables and Indexes suggests that user_ind_partitions view can be used to check containing tablespace for each separate index partition:

select index_name, partition_name, tablespace_name from user_ind_partitions
    where index_name = 'MYINDEX';