单项选择题
A. Issue the ALTER DISKGROUP ... ADD DISK command.
B. Issue the ALTER DISKGROUP ... UNDROP DISKS command.
C. Issue the ALTER DISKGROUP ... DROP DISK CANCEL command.
D. Retrieve the disk from the Recycle Bin after the operation completes
单项选择题 How can you reverse the effects of an ALTER DISKGROUP ... DROP DISK command if it has not yetcompleted?（）
单项选择题 Given the following steps, which would be the correct order to create a backup of an Oracle database in NOARCHIVELOG mode?（） 1.shutdown immediate from RMAN 2.Log into RMAN 3.startup mount from RMAN 4.backup database 5.alter database open 6.backup database plus archivelog delete input
单项选择题 Given the script create script db_backup_datafile_script {backup datafile and 1， and2 plus archivelog delete input；} Run {execute script db_backup_datafile_script using 2；} What is the result of running this command？（）