In this lesson, you have become more familiar with the concept of backup sets
and image sets. Now that you have completed this module, you should be able to:
- Perform online and offline backups
- Describe backup sets versus image copies
- Identify the use of channels with backup operations
- Recognize the use of tags and backups
- Create an image copy
- Identify why and how to parallelize the creation of image copies
- Use the operating system to create image copies
You became familiar with the basic types of backups and examined the image copy type of backup in detail.
The following terms were introduced in this module:
- backup_spec: A variable place holder. 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 datafiles 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.
- channel_id: A variable place holder, i.e., To allocate a channel, you would use the command ALLOCATE CHANNEL channel_id TYPE type; where channel_id is a unique identifier and type is either DISK, to denote a disk file, or a specific type of third party backup device, such as a tape drive.
- filetype: A variable place holder. There are three sets of values you can use for the filetype - datafile, archivelog and current controlfile.
- type: A variable place holder. The type option is used to indicate whether the backup is a standard backup, an incremental backup (with the keyword INCREMENTAL) or a cumulative backup ) with the keyword CUMULATIVE), as described earlier in this course, i.e.
To allocate a channel, you would use the command ALLOCATE CHANNEL channel_id TYPE type;where channel_id is a unique identifier and type is either DISK, to denote a disk file, or a specific type of third party backup device, such as a tape drive.
- tag: A variable place holder. 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.
In the next module, you will learn more about using backup sets.
