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Oracle OCP 1Z0-050（31题）解析

QUESTION 31:

In which two aspects does hot patching differ from conventional patching? (Choose two.)

A. It takes more time to install or uninstall compared with conventional patching.

B. It can be installed and uninstalled via OPatch unlike conventional patching.

C. It does not require down time to apply or remove unlike conventional patching.

D. It is not persistent across instance startup and shutdown unlike conventional patching.

E. It consumes more memory compared with conventional patching.

Answer: C,E

解析：

在Oracle 11g中提出了online patch(也叫hot patch)的特性；Hot patching允许我们在实例始终在线的情况下安装，启用或禁用一个修复补丁或者诊断补丁。针对7*24在线的业务系统，hot patch为我们提供了一条既能避免当机时间而又可以实施补丁的途径。在Oracle 11g中我们可以使用Opatch命令行工具针对任意数据库实施在线补丁(前提是该补丁是一个hot patch)。一般来说在线补丁(hot patches)只能是那些代码修改范围小且复杂度很低的补丁，举例来说它们往往是一些诊断补丁(diagnostic patches)或者小bug的修复(small bug fixes)。值得注意的是hot patching将需要消耗额外的内存，决定其消耗内存数量的因素是:1.补丁本身的大小,2.实例中的进程总数；举例来说某个补丁的大小正好为一个OS page的大小(一般为4kB)，那么当实例中运行的进程总数为1000时，则该hot patching所额外消耗的内存总数为4kB*1000=4MB。

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