ocp認證052考題解析：1Z0-V8.02-第79題
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79. You are working on a database that must be functioning 24 hours a day, 7 days a week. The database is configured in ARCHIVELOG mode.
Which two options do you have for performing user-managed backups? (Choose two.)
A.You can perform consistent backups only.
B.You can perform a complete database backup without shutting down the database instance.
C.You can back up data files only when all data files have the same SCN recorded in the control file.
D.You can back up only those data files whose headers are frozen by using ALTER TABLESPACE BEGIN BACKUP or ALTER DATABASE BEGIN BACKUP commands.
Answer: BD
一致性備份(冷備份)：在數據庫正常關閉情況下做備份，數據庫處于一致性狀態。
(可以用于歸檔和非歸檔)，所有SCN號一致。缺點：數據庫需要關閉。
非一致性備份(熱備份)：數據庫在open狀態下備份(用于歸檔模式)，使用alter database/tablespace xxx begin backup開始備份。
優點：數據庫不需要關閉，用于7x24事務處理的數據庫。
