Oracle Error Message
ORA-14408: partitioned index contains subpartitions in a different tablespace
Reason for the Error
An attempt was made to drop a tablespace which contains indexes whose subpartitions are not completely contained in this tablespace, and which are defined on the tables which are completely contained in this tablespace.
Solution
find indexes with subpartitions which span the tablespace being dropped and some other tablespace(s). Drop these indexes, or move the index partitions to a different tablespace, or find the tables on which the indexes are defined, and drop (or move) them.
