|Lesson 5||Using the Backup Command|
|Objective||Recognize the use of tags and backups |
Using the Backup Command in Oracle
In the previous lesson, we discussed the
run command. In this lesson, you will learn the basic syntax for the
Oracle backup Command
backup command is issued to start a backup job, after the
run command has delimited the job and one or
allocate commands have been issued to establish one or more channels. In its simplest form, the
backup command is:
backup command can include other options, as shown below:
BACKUP type tag (backup_spec1) ...;
The type option is used to indicate whether the backup is a standard backup, an incremental backup (with the keyword
or a cumulative backup (with the keyword
cumulative), as described earlier in this course.
You can also include a level along with the
incremental keyword. If no value is specified for the type of backup, a complete backup is done.
The tag is an optional piece of syntax you can use to specify a name for the backup. This name is included in the information kept
in the recovery catalog, so it should describe the purpose of the backup, such as
'weekly_cumulative_backup'. A tag can be reused.
The backup_spec is an optional piece of syntax that is used to describe a backup set.
You can specify the information such as the data files or tablespaces that are included in the set or the tag for the backup set. You can have more than one backup_spec for a
backup command, but each backup_spec has to be included within a set of parentheses.
The following Simulation walks you through the process of doing a backup with Recovery Manager:
Each channel can be used for only a single backup set.
The details of the
backup command are described more fully in the next module.
In the next lesson, you will learn how to create image copies.
Allocate Backup Commands - Quiz