ORA-30026: Undo tablespace 'string' has unexpired undo with
string(sec) left, Undo_Retention=string(sec)
Answer / guest
Cause: Tried to drop a tablespace that contains unexpired
undo information
Action: lower setting of UNDO_RETENTION or wait a while
before reissue command to drop undo tablespace
Please add more information about this Error
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