These are the details about V$FLASHBACK_DATABASE_STAT： SQL> DESC v$FLASHBACK_DATABASE_STAT Name Null？ Type ------------- -------- -------------- BEGIN_TIME DATE END_TIME DATE FLASHBACK_DATA NUMBER DB_DATA NUMBER REDO_DATA NUMBER ESTIMATED_FLASHBACK_SIZE NUMBER Which two statements regarding the V$FLASHBACK_DATABASE_STATview aretrue？ （） [" BEGIN_TIME is the time at which Flashback logging is enabled."," END_TIME is the time at which the query is executed on the view."," REDO_DATA is the number of bytes of redo data written during the interval."," This view contains information about flashback data pertaining to the last 24 hours."," FLASHBACK_DATA is the amount of flashback data generated since the database was opened."]
一台他励直流电动机拖动恒转矩负载，当电枢电压降低时，电枢电流和转速将（） ["电枢电流减小、转速减小","电枢电流减小、转速不变","电枢电流不变、转速减小","电枢电流不变、转速不变"]
You work as a database administrator for Certkiller .com. Your listener process， L1，is currently listening to three databases：CertK INDB04，Certkiller DB05 and Certkiller DB06. Using Database Configuration Assistant （DBCA） you create one more database，Certkiller DB07，and enable dynamic registration. Which two commands of Listener Control Utility （lsnrct1） would you use to determine whether the dynamic registration occurred for the database， Certkiller DB07， with the L1 listener process？（） ["SHOW L1","SPAWN L1","STATUS L1","SERVICES L1","STATUS LISTENER","SERVICES LISTENER","SHOWcurrent_listener"]
骨力裴罗、大柞荣、皮罗阁的相同之处有（）。①边疆少数民族的首领②接受唐朝中央的领导③建立起本民族的政权④曾与唐朝皇帝会盟 ["①②③","②③④","①②④","①③④"]
You want to perform the following operations for the DATA ASM disk group： -Verify the consistency of the disk. -Cross-check all the file extent maps and allocation tables for consistency. check whether the alias metadata directory and file directory are linked correctly. -Check that ASM metadata directories do not have unreachable allocated blocks. Which command accomplishes these tasks（）？ [" ALTER DISKGROUP data CHECK"," ALTER DISKGROUP data CHECK DISK"," ALTER DISKGROUP data CHECK FILE"," ALTER DISKGROUP data CHECK DISK IN FAILURE GROUP 1"]
1987年池莉发表了《（）》，被认为是新写实小说的发端之作。
