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[多选] When backing up a replication slave, which three should also be backed up in addition to data?()

A . The master.info and relay.info files
B . The relay log files
C . The relay index file
D . Mysql.slave_master_info table
E . Mysql.slave_relay_log_info table
F . Mysql.slave_worker_info table

In which scenario will you issue the following command?()      SQL> RECOVER DATABASE UNTIL TIME ’2005-10-04 : 12:09:08’ USING        BACKUP CONTROLFILE;  when all the control files are missing and only a binary backup of the current control file exists。  when a multiplexed copy of the current control file is missing。 when all the control files are missing and only a script containing the CREATE CONTROLFILE statement exists。  when the SPFILE is missing。 一个严重的事件发生了,支持团队不能在约定的时间内解决这一情况,事情报告给了IT部门经理,这属于那种性质的升级() 正式的升级。 职能性升级。 结构性升级。 操作性升级。 Which two tasks can your perform by using the TO_CHAR function?() Convert 10 to ‘TEN’。 Convert ‘10’ to 10。 Convert ‘10’ to ‘10’。 Convert ‘TEN’ to 10。 Convert a date to a character expression。 Convert a character expression to a date。 Which two statements are true regarding the ORDER BY clause?() The sort is in ascending by order by default.。 The sort is in descending order by default.。 The ORDER BY clause must precede the WHERE clause.。 The ORDER BY clause is executed on the client side.。 The ORDER BY clause comes last in the SELECT statement.。 The ORDER BY clause is executed first in the query execution.。 本程序由主窗体form1和子窗体form2组成,设计界面如下图所示: 主窗体Form1上建立的对象有Panel1、MediaPlayer1、OpenDialog1、Button1(打开文件)、Button2(播放)、Button3(暂停)、Button4(退出)。 子窗体Form2上建立的对象有Label1、BitBtm1(Yes)、BitBtm2(No)。  单击“打开文件”按钮,会弹出打开文件对话框。用户指定一个要播放的文件后,单击“播放”按钮可播放多媒体文件,单击“暂停”按钮可暂停播放。  单击“退出”按钮,会弹出确认对话框(Form2)。如果用户按“Yes”键,程序结束;如果按“No”键,返回主窗体。  下面是Unit1的代码部分,请在下划线处完成程序填空。 When backing up a replication slave, which three should also be backed up in addition to data?()
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