Automatic Storage Management (ASM) is a new feature of Oracle Database 10g which provides a vertical integration of the file system and volume manager specifically built for the Oracle database files. ASM distributes I/O load across all available resource to optimize performance while removing the need for manual I/O tuning (spreading out the database files avoids hotspots). ASM helps DBAs manage a dynamic database environment by allowing them to grow the database size without having to shutdown the database to adjust the storage allocation. Automatic Storage Management allows the DBA to define a pool of storage (called a disk groups) and then the Oracle kernel manages the file naming and placement of the database files on that pool of storage.
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