252 Chapter 7: Components and Subsystems: Features
Two important items should be noted:
DiRT must be used to restore data to the same Unity version from which data was
backed up. For instance, you cannot use DiRT to back up a Unity 3.1(5) system and
then use it to restore to a Unity 4.0(3) system. If possible, the Unity 3.1(5) system
should be upgraded to Unity 4.0(3); then DiRT can be used to back up that system,
and data can be restored to the Unity 4.0(3) system.
The latest versions of DiRT offer the option to include subscriber messages as part
of the backup. This option can be useful for voice mail-only systems with a small
number of users. However, it should not be used on unified messaging systems or
any larger Unity systems. For mail store data (messages, and so on), mail store-aware
backup tools should be used in correlation with DiRT to restore a Unity system intact
with all subscriber messages.
Database Walker
Database Walker, or DBWalker, is a tool that administrators can use to identify—and often
fix—problems in the Unity database. DBWalker can be run in report mode or auto-fix mode.
In report mode, DBWalker analyzes the Unity database and reports back any problems.
From this report, the administrator can use the SA to manually fix broken links or other
Unity database problems. In auto-fix mode, DBWalker can be instructed to automatically
fix a number of problems. Not all problems with the Unity database can be automatically
fixed using DBWalker, but DBWalker can detect and fix these common problems
automatically:
Validate call-handler message recipient
Validate subscriber and call-handler one-key dialing links
Validate that the subscriber language is installed on the Unity server
If left unfixed, each of these problems could result in system errors that surely would
interrupt subscriber and outside caller voice-messaging services. DBWalker can help
identify these problems, in addition to a host of other problems, before subscribers
encounter the issue.
Unity Security Features
For many companies, Unity is a business-critical system, and it interfaces with other critical
business systems such as e-mail and phone systems. Because of this, administrators must
have a means to secure the Unity server against security threats against itself or other
interfacing systems. Unity is a messaging system, so it inevitably will access and store
private information in the form of recorded messages. Because Unity is a conduit for
potentially sensitive information, administrators also must have a means to secure the Unity
system data and the Unity subscriber and administrative interfaces. This section discusses

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