Oracle Solution for Error ora-01539

ORA-01539: tablespace 'string' is not online

What triggered the Error:

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.

What should we do to fix it:

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.