OCP-1Z0-053-V12.02-235题

235.The ORACLE_SID environment variable is set to +ASM. ASMLIB is not used in the configuration.
You executed the following command to startup the Automatic Storage Management (ASM) instance.
SQL> STARTUP;
Which two activities are performed during a successful start up operation? (Choose two.)
A. The databases configured to use the ASM instance are mounted
B. The disk groups are mounted as per the ASM_DISKGROUPS initialization parameter
C. ASM starts the Oracle Cluster Synchronization Services (CSS) daemon if it is not started
D. ASM discovers and examines the contents of all files that are in the paths specified in the
ASM_DISKGROUPS initialization parameters
Answer: BC
答案解析：
参考：/article/1628971.html

ASM启动时会加载磁盘组。

ASM是依赖于CSS守护进程的，因此在启动ASM实例前要确保css守护进程已经启动 。 CSS(Cluster
Synchronization Services) 守护进程用来维持ASM 及客户端数据库实例间的一致性同步，如果是通过dbca建库的话，那么CSS守护进程默认即会启动(跟随系统reboot)。

ASM实例启动是装载磁盘组，而ASM_DISKGROUPS是ASM 实例启动时或使用ALTER DISKGROUP ALL MOUNT命令时，ASM 实例要装载的磁盘组的名称列表。如果为空的话，那么实际就仅仅启动到nomount状态。如果使用SPFILE的话，该参数一般不需要手动修改，ASM能够自动更新该初始化参数中的值。

Oracle Restart 会装载列为相关磁盘组的磁盘组，即使这些磁盘组未与ASM_DISKGROUPS参数列在一起也是如此。该参数没有默认值。
如：ASM_DISKGROUPS = DATA2, FRA

ASM是依赖于CSS守护进程的，因此在启动ASM实例前要确保css守护进程已经启动 。 CSS(Cluster Synchronization Services) 守护进程用来维持ASM 及客户端数据库实例间的一致性同步，如果是通过dbca建库的话，那么CSS守护进程默认即会启动(跟随系统reboot)。