多项选择题
A. Backup control file.
B. Emergency control file.
C. The create controlfile command.
D. The restore controlfile SQL*Plus command.
E. No backup is required. The database will re-create the control file when it is discovered to be lost.
单项选择题 Yourdevelopershaveaskedyoutorestorethedevelopmentdatabase，whichisinNOARCHIVELOGmode，backtolastTuesdaythe20th.YourlastbackupisfromMondaythe19th.Whatdoyoudo？（）
单项选择题 You have lost all your database control files. To recover them， you are going to use the results of the alter database backup controlfile to trace command. Your datafiles and your online redo logs are all intact. Which of the following is true regarding your recovery？（）
单项选择题 A user sends you an email with the following error message： create table idtable（id number） * ERROR at line 1： ORA- 01110： data file 4： ，，/oracle01/oradata/orcl/users01.dbf ORA-27041： 01116： error in opening database file 4 ORA-unable to open file Linux Error： 2： No such file or directory Additional information： 3 You can choose from the following steps： a. Restore the missing database datafiles. b. Take the missing datafile offline. c. Shut down the database. d. Issue the recover tablespace USERS command. e. Issue the Startup Mount command to mount the database. f. Bring the USERS tablespace online. g. Issue the alter database open command. Which is the correct order of these steps in this case？（）