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.