Database Reference
In-Depth Information
TABleĀ 3.2 Format Options (continued)
Option
Description
%F
Combines the database ID (DBID), day, month, year, and sequence into a
unique and repeatable generated name
%h
Specifies the archived redo log thread number
%I
Specifies the DBID
%M
Specifies the month in the Gregorian calendar in MM format
%N
Specifies the tablespace name
%n
Specifies the name of the database, padded on the right with n characters
to a total length of eight characters
%p
Specifies the piece number within the backup set
%s
Specifies the backup-set number
%t
Specifies the backup-set timestamp
%T
Specifies the year, month, and day in the Gregorian calendar
%u
Specifies an eight-character name constituted by compressed representa-
tions of the backup-set or image-copy number
%U
Specifies a system-generated unique filename (this is the default setting)
Configuring Parallelism
Now that you can configure multiple channels, you might want to use them! To do so, you
use the CONFIGURE command along with the PARALLELISM keyword, as shown here:
RMAN> configure device type disk parallelism 2;
This will cause any BACKUP DATABASE command to use two channels, performing the
backup in parallel. This can improve performance of your database backup. It can also cause
performance to decrease if you overparallelize the backup and consume too much CPU,
flood the network, or run out of backup devices.
Note that this, along with the other configuration options, becomes a default option
when set. You can manually override these configured default settings for any backup at
any time.
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