多项选择题
A.You find that one of the redo log members in each redo log group is lost.
B.You find that a data file that belongs to the USERS tablespace is damaged.
C.You find that a data file that belongs to the SYSTEM tablespace is damaged.
D.You find that the current redo log group is damaged and is not available for recovery.
E.You realized while performing a recovery that an archived redo log file needed for recovery is lost.
单项选择题 You have only two redo log groups and these groups get overwritten several times in a day. Your database operates in NOARCHIVELOG mode and usermanaged consistent backups are performed every Sunday night. On Thursday morning， you find that an important table has been dropped and purged. With reference to this scenario， up to what point in time can the data be recovered？（）
单项选择题 YourdatabaseoperatesinARCHIVELOGmodeandusermanagedconsistentbackupsareperformedeverySundaynight.OnTuesday，at9：00a.m.thecurrentlogsequencenumberwas369.Also，onTuesdayyoulostthedatafilebelongingtotheSYSTEMtablespaceandanarchivelogfile（sequencenumber356）thatcontainedredoentriesbetween8：00a.m.and8：30a.m.Withreferencetothisscenario，whatwouldyoudotorecoverthedatabase？（）
单项选择题 Your database operates in ARCHIVELOG mode. Usermanaged consistent backups are performed every Sunday night. On Tuesday， client A drops a table at 8：00 a.m. as follows： SQL> DROP TABLE cust_ord PURGE Table dropped. Client B executes a query at 9：00 a.m. on the same table as follows： SQL> SELECT * FROM cust_ord SELECT * FROM cust_ord * ERROR at line 1： ORA00942： table or view does not exist Client B needs the dropped table and reports the problem to you. With reference to this scenario， which action should you take？（）