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[多选] You are using the control file to maintain information about the database backups that are being performed by Recovery Manager (RMAN).Identify two scenarios is which you must have a recovery catalog. ()(Choose two.)

A . To store the backup information of multiple database
B . To restrict the amount of space that is used by the backups
C . To maintain a backup for a certain time is set by the CONTROL_FILE_RECORD_KEEP_TIME parameter.
D . To list the data files that were in a target database at a given time by using the AT option of REPORT SCHEMA command.

Given:  foo and bar are public references available to many other threads, foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait().  From another thread, what provides the most reliable way to ensure that foo will stop executing wait()?() foo.notify();。 bar.notify();。 foo.notifyAll();。 Thread.notify();。 bar.notifyAll();。 Object.notify();。 往船上输油时,以下各条中哪些是不符合安全的?() 在油轮的歧管附近准备两个灭火瓶。 在装油臂和油轮歧管的连接法兰盘下面放一个油盘。 在装油中如果油轮的歧管较远时,在甲板上吸烟也无防。 在输油时,如果打雷必须中止装油。 电子商务的最大信息载体是() 增值网。 因特网。 配送网。 电信网。 How many individual archive-log destination directories are supported by Oracle Database11g?() 7 。 1 。 10 。 11 。 21。 充装人员应根据()随时调整秤砣的位置。 充装量;。 充装压力;。 钢瓶自重。 You are using the control file to maintain information about the database backups that are being performed by Recovery Manager (RMAN).Identify two scenarios is which you must have a recovery catalog. ()(Choose two.)
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