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单选题
You work as a database administrator for Certkiller .com. You enabled tracing while creating a listener to your database.  What additional information is available to you when you enable tracing?()
A

Information about each Oracle Net connection.

B

Information about each entry in theLinstener.orafile

C

Information about the changed done in the database

D

Information about the different listeners in your system

E

Information about all thenondatabasefiles required to operate the database


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