单项选择题

In a certain cache system, the modified cache block is written to main memory only when the block is replaced. All of following are used to describe this policy EXCEPT

A．store-in
B．write-back
C．copy-back
D．write-through
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单项选择题
Which of the following statements about ORACLE is (are) correct Ⅰ. ORACLE follows SQL standard Ⅱ. ORACLE database defines two logical types: table and view
A．Ⅰonly
B．Ⅱ only
C．Ⅰ and Ⅱ
D．none of　the above
单项选择题
事务的持久性是由DBMS的什么来实现的
A．事务管理子系统
B．并发控制子系统
C．恢复管理子系统
D．完整性约束机制
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