1Z0-082 - Oracle Database Administration I Configuring Oracle Net Services Questions and Answers — Questions and Answers
Question 1: A client is attempting to connect to an Oracle database using the following connect string: `sqlplus scott/tiger@//dbhost:1527/orclpdb`. This connection attempt is failing. The administrator has verified the database is running and the listener on `dbhost` is configured to listen on port 1527 for the service `orclpdb`. Which Oracle Net naming method is being used, and what is the key benefit of this method?
- Directory Naming, which centralizes administration of network service names in an LDAP-compliant directory server.
- Local Naming, which uses a local `tnsnames.ora` file to map service names to connect descriptors.
- External Naming, which relies on a third-party naming service like NIS.
- Easy Connect (or Host Naming), which allows for simple TCP/IP connections without requiring a `tnsnames.ora` file. (Correct answer)
Correct answer: Easy Connect (or Host Naming), which allows for simple TCP/IP connections without requiring a `tnsnames.ora` file.
The connect string syntax `//host[:port][/service_name]` is characteristic of the Easy Connect naming method. The primary advantage of this method is its simplicity; it eliminates the need for client-side configuration files like `tnsnames.ora` or directory server lookups for basic TCP/IP connections.
Question 2: A database administrator needs to ensure that clients resolve connect identifiers by first checking a local `tnsnames.ora` file, and if not found, then attempting to resolve using the Easy Connect naming method. Which parameter in the `sqlnet.ora` file should be configured to define this specific resolution order?
- SQLNET.AUTHENTICATION_SERVICES
- NAMES.DEFAULT_DOMAIN
- NAMES.DIRECTORY_PATH (Correct answer)
- TNS_ADMIN
Correct answer: NAMES.DIRECTORY_PATH
The `NAMES.DIRECTORY_PATH` parameter in the `sqlnet.ora` file specifies the order of naming methods the client will use to resolve a connect identifier. To prioritize local naming followed by Easy Connect, this parameter should be set to `(TNSNAMES, EZCONNECT)`.
Question 3: You are troubleshooting a connection issue where a client receives an `ORA-12154: TNS:could not resolve the connect identifier specified` error. The client is configured to use the Local Naming method. Which of the following is the MOST likely cause of this error?
- The listener on the database server is not running.
- The database service has not registered with the listener.
- The net service name used in the connect string does not have a corresponding entry in the `tnsnames.ora` file. (Correct answer)
- The client has provided an incorrect username or password.
Correct answer: The net service name used in the connect string does not have a corresponding entry in the `tnsnames.ora` file.
The `ORA-12154` error specifically indicates that the client was unable to resolve the provided connect identifier (net service name) into a connect descriptor. When using the Local Naming method, this resolution is done via the `tnsnames.ora` file. The error means the alias is either missing from the file, the file cannot be found, or there is a syntax error in the file.
Question 4: Which two Oracle Net Services configuration files are primarily involved in a standard client-server connection using the Local Naming method?
- `sqlnet.ora` and `protocol.ora`
- `listener.ora` and `tnsnames.ora` (Correct answer)
- `cman.ora` and `sqlnet.ora`
- `tnsnames.ora` and `ldap.ora`
Correct answer: `listener.ora` and `tnsnames.ora`
In a typical Local Naming scenario, the `tnsnames.ora` file on the client side is used to resolve the net service name into a connect descriptor (host, port, service name). The listener process on the server side reads its configuration from the `listener.ora` file to know which protocol addresses to listen on for incoming connection requests.
Question 5: A DBA is using the Oracle Net Manager (netmgr) graphical tool. Which of the following tasks can be accomplished using this utility?
- Creating and managing database users and roles.
- Starting and stopping the database instance.
- Configuring listeners, naming methods, and network profiles. (Correct answer)
- Monitoring real-time database performance and executing SQL queries.
Correct answer: Configuring listeners, naming methods, and network profiles.
Oracle Net Manager is a graphical utility specifically designed for configuring Oracle Net Services. Its primary functions include configuring listeners (`listener.ora`), naming methods like Local Naming (`tnsnames.ora`) and Directory Naming, and managing profile settings (`sqlnet.ora`).
Question 6: An organization wants to centralize the management of its database connection information to avoid distributing and updating `tnsnames.ora` files on hundreds of client machines. Which Oracle Net naming method is best suited for this requirement?
- Local Naming
- Host Naming
- Directory Naming (Correct answer)
- External Naming
Correct answer: Directory Naming
Directory Naming is designed for centralized management of connect identifiers. It stores the connect descriptors in an LDAP-compliant directory server, such as Oracle Internet Directory (OID) or Microsoft Active Directory. Clients are configured to look up connection information from this central directory, simplifying administration and eliminating the need to manage individual `tnsnames.ora` files.
1Z0-082 - Oracle Database Administration I Configuring Oracle Net Services Questions and Answers
A client is attempting to connect to an Oracle database using the following connect string: `sqlplus scott/tiger@//dbhost:1527/orclpdb`.
This connection attempt is failing.
The administrator has verified the database is running and the listener on `dbhost` is configured to listen on port 1527 for the service `orclpdb`.
Which Oracle Net naming method is being used, and what is the key benefit of this method?