单项选择题 In your test database， you find that a user’s session is executing a lot of SQL statements， resulting in the generation of a large number of trace files. While investigating the reason， you find that SQL trace has been enabled at the instance level.  You want to disable SQL trace， remotely， only for that user session to reduce the volume of trace data being generated.  How do you achieve this objective？（）

单项选择题 Theproductiondatabasehasbeenfunctionalforthelastsevendays.Becauseofapplicationrequirements，someoftheinitializationparameterswerechangedduringruntimewithoutanycomments.Youhavebeenaskedtofindoutthevalueoftheparameterswhentheinstancewasstarted.Whichsourcewouldyouusetolocatethisinformation？（）

单项选择题 The backup retention policy is configured as RECOVERY WINDOW 2. You executed the following command in Recovery Manager （RMAN） against your database：  RMAN> REPORT OBSOLETE  What would you see in the output？（）