In which scenario is a Database Administrator NOT required to perform an incomplete recovery？（） when all the online redo log groups are multiplexed and one of the members of a group is missing。 when all the online redo log groups are not multiplexed and one log group is missing。 when all the control files are missing。 when some important tables are deleted from the database and purged from the Recycle Bi。
钻头主切削刃上各点的后角大小（）。
Given: What is the result?（） Compilation fails because of an error in line 7.。 Compilation fails because of an error in line 9.。 If you define D e = new E(), then e.bMethod() invokes the version of bMethod() defined in Line 5.。 If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 5.。 If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 9.。
On Friday at 11:30 am you decided to flash back the database because of a user error that occurred at 8:30am. Which option must you use to check whether a flashback operation can recover the database to the specified time?（） Check the alert log file。 Query the V$FLASHBACK_DATABASE_LOG view。 Query the V$RECOVERY_FILE_DEST_SIZE view。 Query the V$FLASHBACK_DATABASE_STAT view。 Check the value assigned for the UNDO_RETENTION parameter。
认知发展理论认为，儿童使用他已经获得的图式或技能从事并完成活动，这个过程是（） 同化。 顺应。 平衡。 协调。
患者，男性，30岁。学习游泳不慎误人深水区溺水，经抢救出水，发现心跳、呼吸已停。现场首先的处理是（）
