Backup Options
A backup set is created when performing a backup. A backup set is a logical structure containing one or more physical backup pieces, such as datafiles or archived logs. Each backup piece must have a unique name.
Backup file name format specifies the file name format to use for the backup pieces created during the backup. Any name that results in a legal file name on the platform is allowed.
When specifying the Backup file name format, the following substitution variables are available to aid in the generation of unique backup piece names.
%p
Specifies the backup piece number within the backup set.
%s
Specifies the backup set number.
%d
Specifies the database name.
%n
Specifies the padded database name.
%t
Specifies the backup set time stamp.
%u
Specifies an 8 character name composed of compressed representations of the backup set number and the time the backup set was created.
The following are valid only with Oracle 8.1. and later :
%c
Specifies the copy number of the backup piece within a set of duplexed backup pieces.
%U
Specifies a shorthand for %u_%p_%c that guarantees uniqueness in generated backup file names.
NetBackup recommends that a %t be placed at the end of the backup filename format. Without this timestamp, there may be performance degradation as the NetBackup catalog grows.
 Caution
Create a filename format that will generate unique filenames. In Oracle 8.0.x, non-unique filenames can cause backup data to be overwritten, resulting in possible loss of data. In later Oracle versions, non-unique filenames will result in error messages.
Backup set identifier specifies an identifier for the backup set. A backup set can be given a user-specified identifier called a tag, which is a character string that is not a reserved word, typically a meaningful name like "monday_evening_backup" or "weekly_full_backup". This field is optional.
For information on backup options refer to the Oracle Backup and Recovery Guide.
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