本文共 1853 字，大约阅读时间需要 6 分钟。

Which two are the uses of the ASM metadata backup and restore (AMBR) feature? (Choose two.) 

A. It can be used to back up all data on ASM disks.

 B. It can be used to recover the damaged ASM disk group along with the data. 

C. It can be used to gather information about a preexisting ASM disk group with disk paths, disk name, failure groups, attributes, templates, and alias directory structure.

 D. It can be used to re-create the ASM disk group with its attributes.

Answer: CD

解释：

As you are aware, an ASM instance doesn’t store data. It merely maintains the storage metadata such as the names of the disk groups, directories, and so on and stores this metadata in the disk headers. This means that if there is a disk crash and you lose the disk headers, you’re in trouble. You can use RMAN to restore a backup for the database itself, but you’ll have to first re-create the ASM disk groups and directories. If you haven’t kept careful records, you’re in trouble again. Even if you have the records, you must still take the time to re-create the necessary ASM metadata. In Oracle Database 11g, the ASMCMD utility is extended to provide ASM metadata backup and restore functionality through the md_backup and md_restore commands. This functionality is known as the ASM metadata backup and restore (AMBR). The goal is to enable you to easily re-create an ASM disk group with an identical template and alias directory structure, using the backup of the ASM metadata. This eliminates the need for manually re-creating the disk groups and the necessary directories or templates following the loss of an ASM disk group. The new md_backup option in Oracle Database 11g lets you perform an ASM metadata backup for a disk group. The command will back up into a backup text file, disk group metadata including fail groups, disks, attributes, aliases, and templates

转载地址：https://blog.csdn.net/wll_1017/article/details/45336509 如侵犯您的版权，请留言回复原文章的地址，我们会给您删除此文章，给您带来不便请您谅解！