Automated Storage Management, a disk volume manager used for storing Oracle files (like datafiles, controlfiles, logfiles, RMAN backupsets, etc). ASM allows administrators to add and remove disks while the database is available. Data is automatically stripped accross all disks in a disk group, and is optionally mirrored.
airspace management element
Address space match, part of virtual memory management.
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Association for Systems Management
Automatic Session Manager The ASM triggers automatic collection and transfer of system data via a background job that is to run automatically and makes them available in the service session at due time.