单项选择题
The UNDO_RETENTION parameter in your database is set to 1000 and undo retention 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 every 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 UNDO tablespace for 1，000 seconds，then it gets moved to the TEMPORARY tablespace to provide read consistency.
相关考题
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单项选择题
YoureceivedcomplaintsaboutthedegradationofSQLqueryperformance.YouidentifiedtopSQLqueriesthatconsumetime.WhatwouldbeyournextsteptofindoutrecommendationsaboutstatisticscollectionandrestructuringoftheSQLstatementtoimprovequeryperformance？（）
A.run Segment Advisor
B.run SQL Tuning Advisor on top SQL statements
C.run the Automatic Workload Repository （AWR） report
D.run the Automatic Database Diagnostic Monitor （ADDM）on top SQL statements -
多项选择题
Whichthreestatementsaretrueaboutthestagesofdatabasestartup？（）
A.Data files and redo log files can be renamed at the MOUNT stage.
B.Control files are read at the OPEN stage for the location of data files.
C.Control files are required to bring the database to the NOMOUNT stage.
D.Data files and redo log files are made available to users at the OPEN stage.
E.Data files and online redo log files are checked for consistency while opening the database -
多项选择题
Whichthreepiecesofinformationareconsideredwhiledecidingthesizeoftheundotablespaceinyourdatabase？（）
A.the size of an undo block
B.the size of the redo log files
C.undo blocks generated per second
D.the size of the database buffer cache
E.the value of the UNDO_RETENTION parameter
