The differential backup facility collects as a backup only the information changed since the previous backup was made. Therefore, this facility reduces the amount of time it takes to make the backup. If the database is large and the amount of data updating has been small, consider use of the differential backup facility. For details on how to use the differential backup facility, see 6.5 Acquiring a differential backup.

In the following cases, you must apply backup-hold to RDAREAs subject to being backed up.

• When a backup is to be made without entering the pdcopy command (when making a backup using another product's facilities)
• When the Logical Volume Manager (LVM) is used for the database (to execute the pdcopy command in the updatable mode, the target RDAREAs must be backed up and held)

For details on backup-hold, see 6.7 Backup acquisition using backup-hold (backup without using the pdcopy command).

The frozen update command applies to user LOB RDAREAs. It is a function for placing in frozen update status HiRDB files with full data pages (all updating completed). Once HiRDB files are in frozen update status, they do not need to be backed up again. This means that the amount of time required to make subsequent backups of the user LOB area is reduced. For details about making backups when the frozen update command is used, see 6.8 Backup acquisition when the frozen update command (pddbfrz command) is used.

When you use the NetBackup linkage facility, you can create backup files to be used by the database copy utility (pdcopy) or the database recovery utility (pdrstr) on a medium that is managed by the NetBackup server. The JP1/VERITAS NetBackup Agent for HiRDB License is required in order to use the NetBackup linkage facility. For details about the NetBackup linkage facility, see the JP1/VERITAS NetBackup v4.5 Agent for HiRDB License Description and User's Guide.

To change the standard host name (computer name) while HiRDB is running and when the NetBackup linkage facility is being used, see 9.8(1) Changing the standard host name (computer name) while the NetBackup linkage facility is being used. To use the NetBackup linkage facility in a system switchover configuration, see For details about how to set up the facility, see the following subsections:

• For standby system switchover (monitor mode): 26.2.4(7) Notes on using the NetBackup linkage facility
• For standby system switchover (server mode): 26.3.4(7) Notes on using the NetBackup linkage facility
• For standby-less system switchover (1:1): 26.4.3(7) Notes on using the NetBackup linkage facility
• For standby-less system switchover (effects distributed): 26.5.2(7) Notes on using the NetBackup linkage facility