单项选择题

Your database is running under automatic undo managemen……

Your database is running under automatic undo management and the UNDO_RETENTION parameter is set to 900 sec. You executed the following command to enable retention guarantee：
SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE；
What effect would this statement have on the database？（）

A.The extents in undo tablespace retain data until the next full database backup.
B.The extents containing committed data in the undo tablespace are never overwritten.
C.The extents which no longer contain uncommitted data in the undo tablespace are not overwritten for at least15 minutes.
D.The extents containing committed data in the undo tablespace are not overwritten until the instance is shut down.

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热门试题

单项选择题WhichstatementistruewhenyouruntheSQLTuningAdvisorwithlimitedscope？（）

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C.SQL Profile recommendations are not generated for the SQL statements.
D.The staleness and absence of the statistics are not checked for the objects in the query supplied to the SQL Tuning Advisor.

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C.It is an operating system （OS） file.
D.It is a Recovery Manager （RMAN） script

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单项选择题Your alert log file has the following information： Tue May 25 17：43： 38 2004 ORA-00060： Deadlock detected. More info in file u01 app oracle admin ORCL udump orcl_ora_3173.trc. What would you do to ensure that database is still running correctly？（）

A.examine the trace file and kill the session that caused the deadlock
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E.examine the trace file for details and use the Undo Advisor to rollback the transaction that caused the deadlock