Error E033
Message
[DBC-E033] %s: Instance not available (%s:%s)
Explanation
The instance
Solution:
Skip the instance using an N in the 2nd field of the credentials file.
Solution 2:
Open the database (if it should be opened)
Solution 3:
Run dbcollect as oracle (or root) user without credentials file (in which case it connects as SYSDBA without requiring a TNS connection