OCP 1Z0 053 235

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

ASM实例与数据库实例是两回事儿

sid设置为asm后，只会启动asm到mount状态

不会自动启动数据库实例

http://docs.oracle.com/cd/E11882_01/server.112/e18951/asminst.htm#OSTMG94087

Connecting To and Starting Up an Oracle ASM Instance

You start an Oracle ASM instance similarly to the way in which you start an Oracle database instance with some minor differences.

When starting an Oracle ASM instance, note the following:

• To connect to a local Oracle ASM instance with SQL*Plus, set the ORACLE_SID environment variable to the Oracle ASM system identifier (SID).

  The default Oracle ASM SID for a single-instance database is +ASM, and the default SID for Oracle ASM for an Oracle RAC node is+ASMnode_number where node_number is the number of the node. The ORACLE_HOME environment variable must be set to the Grid Infrastructure home where Oracle ASM was installed.

  Note:

  Oracle recommends that you do not change the default Oracle ASM SID name.

• The initialization parameter file must contain the following entry:

  INSTANCE_TYPE = ASM

  This parameter indicates that an Oracle ASM instance, not a database instance, is starting.

• When you run the STARTUP command, rather than trying to mount and open a database, this command attempts to mount Oracle ASM disk groups.

  For information about disk groups that are mounted at startup time, see "About Mounting Disk Groups at Startup".

  After the Oracle ASM instance has started, you can mount disk groups with the ALTER DISKGROUP...MOUNT command. See"Mounting and Dismounting Disk Groups" for more information.

• The associated Oracle database instance does not have to be running when you start the associated Oracle ASM instance.