Oracle® Database 11g / 12c / 18c error codes ORA-01539: tablespace '[string]' is not online
ORA-01539: tablespace '[string]' is not online
Oracle Error Code: ORA-01539
Cause: Failed to either make a tablespace read only or offline because it is not online. A tblespace must be online before it can become read only or offline normal.
Action: Check the status of the tablespace. Use IMMEDIATE or TEMPORARY options to force all files offline. Bring the tablespace online before making it read only.