用下面的语句所定义数组的元素个数是( )。 Dim arr(3 To 5,-2 To 2) A. 20 B. 12 C. 15 D. 24
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举一反三
【单选题】View the Exhibit. You executed the following command to perform a backup of the USERS tablespace: RMAN> BACKUP TABLESPACE USERS; Which type of backup would this command perform?()
A.
backup set
B.
image copy
C.
incremental backup
D.
None; the user receives an error indicating that the backup type must be specified.
【单选题】Every Sunday the Unix system administrator has a job that executes a full backup of the entire Unix system your database is on. Is this backup usable for backup and recovery of your database?()
A.
Yes, if the database is in ARCHIVELOG mode
B.
Yes, if the database is in NOARCHIVELOG mode
C.
No, the backup is not usable in any way
D.
Only if the ENABLE_ONLINE_BACKUP parameter is set to TRUE
【单选题】The backup utility reports an error while performing the backup process. The server indicates noother problems. Which of the following is the MOST likely cause of the failed backup?()