oracle error - ORA-00202: control file: 'string'

ORA-00202:	control file: 'string'
Cause:	This message reports the name file involved in other messages.
Action:	See associated error messages for a description of the problem.

oracle error - ORA-00200: control file could not be created

ORA-00200:	control file could not be created
Cause:	It was not possible to create the control file.
Action:	Check that there is sufficient disk space and no conflicts in filenames and try to create the control file again.

oracle error -ORA-00166: remote/local nesting level is too deep

ORA-00166:	remote/local nesting level is too deep
Cause:	Too many remote table operations required a reverse trip back to the local site, for example to execute a local function on a remote table.
Action:	Rearrange the query or co-locate the functions with the tables.