Error:
ORA-12520(ORA-12520)
Text:
TNS:listener could not find available handler for requested type
of server
---------------------------------------------------------------------------
Cause:
None of the known and available service handlers for requested
type of server (dedicated or shared) are appropriate for the
client connection.
Action:
Run "lsnrctl services" to ensure that the instance(s) have
registered with the listener and that the appropriate handlers are
