Management has decided that the database must be available 24 hours a day， 7 days a week. Given this requirement， which type of backup is required？（）

A.Directory server
B.Hostname adaptor
C.TCP/IP host file
D.Connection Manager
E.connecting pooling
F.external procedures
G.listener names and protocol addresses
H.Net Service names in a tnsnames.ora file
I.naming methods the client uses to resolve connect identifiers

A.data files
B.control file
C.password file
D.online redo log files
E.initialization parameter file

A.The dispatcher returns the response to the user.
B.The dispatcher places the request into the request queue.
C.The shared server places the response in the response queue.
D.The response is handed off to the next available dispatcher.
E.A shared server picks up the request from the request queue and processes the request.