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Oracle Tips by Burleson |
Oracle Disk I/O Tuning
Chapter 5:
The Oracle Database 10g introduces
the ASM instance, a special Oracle instance that manages the disks
in disk groups. The ASM instance must be configured and running for
the database instance to access Automated Storage Management files
ASM instances are not used to mount
databases, they are simply used to coordinate data layout for
database instances. However, the database instances do direct I/O to
disks in disk groups. I/O doesn't go through the ASM instance.
ASM instances cannot mount a database;
they mount disk groups. An ASM instance must be started before a
database instance can access files in disk groups. Multiple and
separate database instances can share disk groups for their files.
On a single node, a single ASM instance typically manages all disk
groups. In a Real Application Cluster environment, each node
typically has one ASM instance that manages all disk groups for that
node in a coordinated manner with the rest of the cluster.
The above text is
an excerpt from:
Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle
Databases
ISBN
0-9745993-4-4
by Mike Ault
Oracle Consulting
Services
Burleson
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