单项选择题
You work as a database administrator for Certkiller .com. The UNDO_RETENTION parameter in your database is set to 1000 and undoretention is not guaranteed. Which statement regarding retention of undo data is correct？（）
A.Undo data becomes obsolete after 1，000 seconds.
B.Undo data gets refreshed after 1，000 seconds.
C.Undo data will be stored permanently after 1，000 seconds.
D.Committed undo data would be retained for 1，000 seconds if free undo space is available.
E.Undo data will be retained in the UNDOtablespacefor 1，000 seconds， then it gets movedmovedto the TEMPORARYtablespaceto provide read consistency.
相关考题
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单项选择题
YourCertkiller.comdatabaseisinARCHIVELOGmode.ThedatafilethatbelongstotheSYSTEMtablespacehasbecomecorrupted.Uptowhatpointcanyourecoverthedatabase？（）
A.Until last commit
B.Until the time you perform recovery
C.Until the time the date file got corrupted
D.Until the point where the last transaction begun
E.You cannot recover the SYSTEMtablespaceand must re-create the database. -
单项选择题
You work as a database administrator for Certkiller .com. In your production database， the size of Database Buffer Cache needs to be increased immediately for the current as well as future instances of the database. The Oracle instance has been configured to accommodate any changes in the size of the memory structures. At this is production database， you want to accomplish this task with no impact on the user’s connections. Which activity must you have completed before accomplishing this task？（）
A.You must have started the database instance in restricted mode.
B.You must have started the database instance inNORMALmode.
C.You must have started the database instance with server parameter file.
D.You must have started the database instance but must not have mounted.
E.You must have started the database instance but must not have opened. -
多项选择题
You work as a database administrator for Certkiller .com. You decided to manage client and server connections using Local Naming method in Certkiller .com. When you try to connect to the database you get the following error： ERROR： ORA-12154：TNS：couldnot resolve service name Which network configuration files would you look into to resolve this error？（）
A.snmp.ora
B.names.ora
C.spfile.ora
D.sqlnet.ora
E.listener.ora
F.tnsnames.ora
