HP B6960-90078 Delta backup, See also backup types Device, Device chain, Differential backup

Glossary

delta backup

A delta backup is a backup containing all the changes made to the database from the last backup of any type.

See also backup types

device

A physical unit which contains either just a drive or a more complex unit such as a library.

device chain

A device chain consists of several standalone devices configured for sequential use. When a medium in one device gets full, the backup automatically continues on a medium in the next device in the device chain.

device group (EMC Symmetrix specific term)

A logical unit representing several EMC Symmetrix devices. A device cannot belong to more than a single device group. All devices in a device group must be on the same EMC Symmetrix unit. You can use a device group to identify and work with a subset of the available EMC Symmetrix devices.

device streaming

A device is streaming if it can feed enough data to the medium to keep it moving forward continuously. Otherwise, the tape has to be stopped, the device waits for more data, reverses the tape a little and resumes to write to

the tape, and so on. In other words, if the data rate written to the tape is less or equal the data rate which can be delivered to the device by the computer system, then the device is streaming. Streaming significantly improves the performance of the device and use of space.

DHCP server

A system running the Dynamic Host Configuration Protocol (DHCP) providing dynamic configuration of IP addresses and related information. Data Protector can back up DHCP server data as part of the Windows configuration.

differential backup

An incremental backup (incr) based on any previous Data Protector backup (full or any incremental), which must still be protected.

See incremental backup.

differential backup (MS SQL specific

term)

A database backup that records only the data changes made to the database after the last full database backup.

See also backup types.

differential database backup

A differential database backup records only those data changes made to the database after the last full database backup.

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