When you issue the RMU Server Backup_Journal Suspend command,
after-image journal (AIJ) backup operations are temporarily
suspended. However, the suspended state is not stored in the
database root file. Thus, if the node from which the AIJ backup
operations were suspended fails, then AIJ backup operations by
the AIJ Backup Server (ABS) are automatically resumed (assuming
the ABS was running prior to the suspension).
The purpose of RMU Server Backup_Journal Suspend command is to
temporarily suspend AIJ backup operations during a period of
time when backing up .aij files would prevent subsequent commands
from operating properly. For example, if you have a Hot Standby
database, the time from when the master database is backed up
to the time that database replication could commence might be
long. During this period, .aij backup operations would prevent
the replication from starting. (See the Oracle Rdb7 and Oracle
CODASYL DBMS: Guide to Hot Standby Databases for information on
Hot Standby databases.)
The solution to this problem is to use the RMU Server Backup_
Journal Suspend command to suspend AIJ backups from the time
just prior to beginning the database backup until after database
replication commences.
AIJ backup operations are suspended until any of the following
events occur:
o The database is closed on the node from which AIJ backup
operations were suspended.
o The node fails from which AIJ backup operations were
suspended.
o Database replication is started on the node from which AIJ
backup operations were suspended, as a master database.
o AIJ backup operations are explicitly resumed on the node from
which AIJ backup operations were suspended. (This occurs when
you issue the RMU Server Backup_Journal Resume command. See
the Server_Backup_Journal help entry for details.)