What Is Automatic Storage Management? - Oracle 10g

Automatic Storage Management (ASM) simplifies database administration. It eliminates the need for you, as a DBA, to directly manage potentially thousands of Oracle database files. It does this by enabling you to create disk groups, which are comprised of disks and the files that reside on them. You only need to manage a small number of disk groups.

In the SQL statements that you use for creating database structures such as tablespaces, redo log and archive log files, and control files, you specify file location in terms of disk groups. Automatic Storage Management then creates and manages the associated underlying files for you.

Automatic Storage Management extends the power of Oracle-managed files. With Oracle-managed files, files are created and managed automatically for you, but with Automatic Storage Management you get the additional benefits of features such as mirroring and striping.

Automatic Storage Management does not eliminate any existing database functionality. Existing databases are able to operate as they always have. Existing Overview of the Components of Automatic Storage Management databases using file systems or with storage on raw devices can operate as they always have. New files can be created as ASM files while old ones are administered in the old way. Databases can have a mixture of ASM files, Oracle-managed files, and manually managed files all at the same time.

To create a database that uses storage managed by Automatic Storage Management, you must first start an ASM instance. However, an ASM instance does not require that a database instance is running Automatic Storage Management is integrated into the database server; you do not need to install it as a separate product.


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