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"]
Which IOS command shows the detailed error report?（） ["errpt -A ","errpt -a ","errlog -a ","errlog -l"]
请简略描述安全链与变桨系统之间的关系。
You are working on an Oracle Database 10g database. Because of data loss， you decided to perform a Flashback Database operation using the following command： SQL> FLASHBACK DATABASE TO TIMESTAMP（SYSDATE 5/24）; Which two statements are true？ （） ["SYSDATE should not be used with TIMESTAMP.","The database must have multiplexed redo log files.","The database must be in the MOUNT state to execute the command.","The database must be opened with the RESETLOGS option after the flashback operation.","The entire database needs to be restored from the most recent backup before the flashback operation."]
封堵结合器上有（）个平衡孔。 ["4","3","2","1"]
产毒真菌主要有哪些？
