Erro ORA-12520

[DanielBParticipante]

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
accepting connections.