VERITAS Extension for Oracle Disk Manager

VERITAS Extension for Oracle Disk Manager is a custom storage interface defined by Oracle Corporation beginning with Oracle9i. Oracle Disk Manager allows Oracle9i to exploit system bandwidth through an improved Application Programming Interface (API) that contains advanced kernel support for file I/O. Oracle Disk Manager reduces administration overhead by providing enhanced support for the Oracle Managed Files (OMF) infrastructure also introduced beginning with Oracle9i. Combining VERITAS Extension for Oracle Disk Manager with Oracle9i offers better database throughput for I/O intensive workloads due to specialized I/O features that greatly improve the I/O system call profile for such key Oracle server processes as the Log Writer and Database Writers.

With VERITAS Extension for Oracle Disk Manager, Oracle9i is able to use the same system calls for datafiles stored in the VERITAS File System as they do with raw partitions. Oracle Disk Manager files look just like ordinary file system files and can be handled as such. Care is given within Oracle Disk Manager to ensure files are created with contiguous disk blocks automatically for improved sequential file access performance. Oracle Disk Manager files can be backed up and recovered through VERITAS NetBackup, Oracle Recovery Manager (RMAN), or other backup software. See Using VERITAS Extension for Oracle Disk Manager for more information.