单项选择题
A. The time when the last flashback operation in your database was performed.
B. The time when the first flashback operation in your database was performed.
C. A list of flashback operations performed in your database using SCN and time.
D. The approximate time and the lowest system change number （SCN） to which you can flash back your database.
单项选择题 YoudatabaseoperatesinARCHIVELOGmodeanduser-managedconsistentbackupsareperformedeverySundaynight.OnTuesday，at9：00a.m.thecurrentlogsequencenumberwas369.Also，onTuesdayyoulostthedatafilebelongingtotheSYSTEMtablespaceandanachivelogfile（sequencenumber356）thatcontainedredoentriesbetween8：00a.m.and8.30a.m.Withreferencetothisscenario，whatwouldyoudotorecoverthedatabase？（）
多项选择题 Youlostadatafilethatbelongstoanindextablespaceinyourdatabase，whichoperatesinARCHIVELOGmode.Lossofthedatafileresultedinincreasedresponsetimeonyourqueries.Whichtwooptionswouldyouusetosolvethisproblem？（）
多项选择题 Users in your production database complain that they are getting the following error message while trying to insert rows into the ORDERS table： ERROR at line 1： ORA-01654： unable to extend index USERS.ORDERS_IND by 8 in tablespace INDEXES.While investigating， you find that the INDEXES tablespace has run out of space and there is no more free space on the disk where the data files are available. Which two actions could you perform to overcome this error without affecting the queries that are currently being executed？（）