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Oracle Tips by Burleson |
Oracle10g ASM - Automated Storage Management
Automated Storage Management (ASM) was designed to simplify database
administration. ASM eliminates the need for the DBA to directly manage the
thousands of Oracle database files that could be present in a modern Oracle
instance. ASM does this by enabling ASM disk groups, which are logical
units comprised of disks and the files that reside on them. Using ASM, the
management of thousands of Oracle files is reduced to managing a small
number of disk groups.
The SQL statements used for creating database structures, such as
tablespaces, redo logs, archive log files, and control files, must specify
file location in terms of ASM disk groups, in order to use ASM. ASM will
then create and manage the associated underlying files for you.
ASM is the logical extension of the power of Oracle-managed files (OMF). In
previous releases of OMF, files were created and managed automatically for
you, but with ASM you reap the additional benefits of features such as ASM
disk group mirroring and striping.
ASM was designed to preserve all existing database functionality. Your
existing databases will operate as they always have. Existing databases
using file systems or with storage on raw devices will operate as they
always have. However, even in existing databases, new files can be created
as ASM files while old ones are administered in the old way. This means
that databases can have a mixture of ASM files, Oracle-managed files, and
manually managed files all at the same time.
To turn on ASM you must create a separate ASM instance before you start
your database instances. An ASM instance does not require that a DB
instance be running; as might be the case when you are initially
configuring the components managed by the ASM instance. But to use
Automated Storage Management for managing your Oracle database files, you
must have both a database instance and an ASM instance running. Automated
Storage Management is integrated into the database server; you do not need
to install it as a separate product.
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