052-230(新增70题2018)
Your application demands frequent connection and disconnection from the database. You have three listener processes that are listening for the database PROD.
While setting up the connect string using Oracle Enterprise Manager 11g Database Control, which two options would you select to balance the connection load across all the listener processes? (Choose two.)
A. Use only the first address.
B. Try one address, selected at random.
C. Try each address, in order, until one succeeds.
D. Try each address, randomly, until one succeeds.
Answer: BD
client load balancing
Load balancing, whereby if more than one listener services a single database, a client can randomly choose between the listeners for its connect requests. This randomization enables all listeners to share the burden of servicing incoming connect requests.
connect string
Information the user passes to a service to connect, such as user name, password, and connect identifier:
CONNECT username@net_service_name
connection load balancing
The method for balancing the number of active connections for the same service across the instances and dispatchers. Connection load balancing enables listeners to make routing decisions based on how many connections for each dispatcher and the load on the nodes.
