Ora-12520:tns:listener could not find available handler for requested type of server

When you encounter a ORA-12520 error, as follows:

English Error Tip:

Ora-12520:tns:listener could not find available handler for requested type of server

Chinese error Tip:

Ora-12520:tns: Listener cannot find an available handler for the requested server type

Generally you should check the cause of the error and solve the problem from the following two aspects:

1: The database is a dedicated server, but the connection that is set in the Tnsname.ora configuration file is shared, which requires modifying the Tnsname.ora configuration file, which is typically the first time a database server is connected.

2: Running a normal database server, and suddenly reported ORA-12520 errors, generally because the process is not enough to cause. You need to increase the value of the processes parameter.

Ora-12520:tns:listener could not find available handler for requested type of server