On Tuesday， a junior DBA dropped an important application user account， whose schema has important tables. You are asked to recover all the objects in the schema. On investigation， you find that the user account was dropped at 11：00 a.m. and Sunday’s backup is the most recent backup. Which flashback feature would you use？（） ["Flashback Drop","Flashback Table","Flashback Database","Flashback Version Query","Flashback Transaction Query"]
富营养化
Which three types of files can be automatically placed in the flash recovery area fast recovery area in 11g Release 2？（） [" Alert log file"," Archived redo log files"," Control file autobackups"," Server Parameter file （SPFILE）"," Recovery Manager （RMAN） backup piece"]
产毒真菌主要有哪些？
Which of the following are types of members？（） ["non-registered users","stores","organizations","products","access grou"]
请简略描述安全链与变桨系统之间的关系。
