What is hot backup (dynamic backup)?

A technique used in data storage and backup that enables a system to perform a routine backup of data, even if the information is becoming accessed by a user. Hot backups are a well-liked backup solution for multi-user systems as no downtime to carry out the backup is needed. If a user alters the data during the backup method (e.g. tends to make alterations at the precise moment the backup system is processing that data) the final version of the backup might not reflect those alterations. Hot backup might also be referred to as a dynamic backup or active backup.

Hot backup is a configuration exactly where a single machine is in a standby mode, ready to take more than the load from a failing program. Starting with D3 9., hot backup now tests to confirm that a license has been bought.

It is frequently necessary to have a technique configuration exactly where downtime due to a hardware or computer software failure cannot be tolerated, or should be reduced to a very quick time. A remedy more reasonably priced than fault tolerance is to double all needed hardware sources and keep the database on two normal systems. This document examines the problems involved in this hot backup configuration, its benefits, its limitations and the system administration procedures.

Hot backups are performed whilst the database is operating. This sort of backup does not block regular database operations, and it captures even modifications that take place while the backup is taking place. For these motives, hot backups are desirable when your database “grows up” — when the information is big enough that the backup requires significant time, and when your data is crucial adequate to your enterprise so that you should capture each and every final alter, with no taking your application, internet website, or net service offline.

Hot backups involve particular risks. If the data is altered whilst the backup is in progress, the resulting copy could not match the final state of the data. If recovery of the data becomes essential (for instance, following a method crash), the inconsistency have to be resolved. The Oracle database preserves the integrity of the data by making a so-named redo log prior to executing a hot backup and by placing the program in a particular hot-backup mode even though the data is copied. Performance might be degraded as the backup is taking place. Person customers could notice this as a temporary method or network slowdown.