单项选择题
A. All the tables having the same original name as DEPT2 will be purged from the recycle bin.
B. The table with dropscn = 1928151 （oldest dropscn） will be purged from the recycle bin.
C. The table with dropscn = 1937123 （most recent dropscn） will be purged from the recycle bin.
D. None of the tables will be purged because there are multiple entries with the same original name in the recycle bin.
单项选择题 While designing the database for one of your online transaction processing （OLTP） applications， you want to achieve the following： a） high availability of data b） faster primary key access to the table data c） compact storage for the table Which type of tables would you use to achieve these objectives？（）
单项选择题 Youexecutedthefollowingqueryinyourdatabase：SELECToldest_flashback_scn，oldest_flashback_timeFROMV$FLASHBACK_DATABASE_LOG；Whatwouldyoudeterminefromthe output？（）
单项选择题 YoudatabaseoperatesinARCHIVELOGmodeanduser-managedconsistentbackupsareperformedeverySundaynight.OnTuesday，at9：00a.m.thecurrentlogsequencenumberwas369.Also，onTuesdayyoulostthedatafilebelongingtotheSYSTEMtablespaceandanachivelogfile（sequencenumber356）thatcontainedredoentriesbetween8：00a.m.and8.30a.m.Withreferencetothisscenario，whatwouldyoudotorecoverthedatabase？（）
