Database Reference
In-Depth Information
FiGURe 3.2
Relationship between RMAN backups, backup sets, and backup set pieces
Backup
Backup
Set
Logical
Backup
Set
Backup
Set
Piece
Backup
Set
Piece
Physical
Files
Backup
Set
Piece
Backup
Set
Piece
FiGURe 3.3
Image vs. regular backups
Original Datafile
Regular RMAN Backup Set
Image Copy
You can also make image copies of data files or tablespaces, as shown in these examples:
RMAN>backup as copy datafile 4;
RMAN>Backup as copy tablespace users;
If you prefer to always use image copies rather than backup sets, you can configure
RMAN to do so by default with the
CONFIGURE
command, as shown here:
configure device type disk backup type to copy;
RMAN can use a mixture of image copies, incremental backups, and archived redo logs
when performing recovery (which we will discuss in more detail in Chapter 4, “Using the
RMAN Recovery Catalog”). This can make total recovery of your database, a tablespace,
or a data file much quicker.
Don't Confuse Terms
Before we start talking about offline and online backups we wanted to make sure you don't
confuse the notion of online and offline backups with consistent and inconsistent backups.
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