Backup Devices for Large Databases (SAP Library - SAP Database Guide: Oracle (BC-DB-ORA-DBA))

Backup Devices for Large Databases

Definition

This section discusses how to use devices when backing up a large Oracle database.

Use

Do not perform the backup over a network, but either to volumes in locally mounted backup devices or directly to hard disks.

Backup devices:

The maximum number of locally connected tape devices supported by BRBACKUP is 255.

Backup devices (for example magneto-optical media) that are addressed with an external backup program can be reached using the BACKINT interface. For more information, see External Backup Programs for Large Databases.

BRBACKUP offers only limited support for automatic tape changers such as jukeboxes. However, you can address such devices using the BACKINT interface to external backup programs.

Use tape units with a larger capacity and higher throughput rate if possible.

Factors other than the performance of the backup device also play a large role, such as:

Server throughput, in particular, hard disk access times, system bus speed, I/O bus speed.
Do not mount too many backup devices on one I/O bus, so as not to overload it. If hard disks and tape units are mounted on the same I/O bus, the load is split between the mounted devices.

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