フリー問題

問題文

A DBA who is new to Oracle ASM asks what an ASM instance actually opens, and what it gives to the database instances that use it. Which statement is correct?

選択肢

1. It mounts disk groups rather than a database, it keeps the metadata of those disk groups inside the disk groups themselves, and it performs the block input and output on behalf of every database instance on the node.
2. It mounts the database on behalf of the database instances, it keeps the metadata of the disk groups in the cluster registry, and it performs the block input and output for the database instances that connect to it.
3. It mounts disk groups rather than a database, it keeps the metadata of those disk groups inside the disk groups themselves, and it hands the file extent map to a database instance when that instance creates or opens a file.
4. It mounts disk groups rather than a database, it keeps the metadata of those disk groups in the cluster registry, and it hands the file extent map to a database instance when that instance creates or opens a file.