80.You perform differential incremental level 1 backups of your database on each working day and lev
2016-07-27 11:40
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80.You perform differential incremental level 1 backups of your database on each working day and level 0
backup on Sundays, to tape.
Which two statements are true about differential incremental backups? (Choose two.)
A.The backup performed on Sundays contains all the blocks that have ever been used in the database.
B.The backup performed on Sundays contains all the blocks that have changed since the last level 1 backup.
C.The backup performed on each working day contains all the blocks that have changed since the last level 0 backup.
D.The backup performed on Monday contains all the blocks that have changed since the level 0 backup, and every other working day contains all the blocks that have changed since the level 1 backup.
答案：AD
解析：题目的意思是，在星期天执行0级备份，在其他时候执行1级备份，备份路径为磁带上
级别0增量备份包含指定数据文件中的所有块，但从未使用过的块除外，等同于一个数据文件完全备份，
完全备份策略不能与增量备份策略共用，它是独立，级别1有两种类型，一种是微分备份，它备份上一个级别0或1之后发生了变化的块。一种是累积备份，它
备份上一个级别0备份以来所有发生了变化的块
因此A正确，B错误，C错误这个时累计备份（Cumulative Incremental ），D正确，这个就是differential incremental
backup on Sundays, to tape.
Which two statements are true about differential incremental backups? (Choose two.)
A.The backup performed on Sundays contains all the blocks that have ever been used in the database.
B.The backup performed on Sundays contains all the blocks that have changed since the last level 1 backup.
C.The backup performed on each working day contains all the blocks that have changed since the last level 0 backup.
D.The backup performed on Monday contains all the blocks that have changed since the level 0 backup, and every other working day contains all the blocks that have changed since the level 1 backup.
答案：AD
解析：题目的意思是，在星期天执行0级备份，在其他时候执行1级备份，备份路径为磁带上
级别0增量备份包含指定数据文件中的所有块，但从未使用过的块除外，等同于一个数据文件完全备份，
完全备份策略不能与增量备份策略共用，它是独立，级别1有两种类型，一种是微分备份，它备份上一个级别0或1之后发生了变化的块。一种是累积备份，它
备份上一个级别0备份以来所有发生了变化的块
因此A正确，B错误，C错误这个时累计备份（Cumulative Incremental ），D正确，这个就是differential incremental
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