8.7 Downgrading the HADB server version (restoring the previous version)
This section explains how to restore the previous version of HADB server after a version upgrade. The process of restoring the previous version of the HADB server is called a version downgrade.
Note that new facilities available after a version upgrade cannot be used by a previous version of HADB server.
- Important
-
If you need to restore the previous version because the version upgrade process failed, see 8.6.4 Steps to take when version upgrading fails.
The version downgrading method depends on whether a full backup of the database had been acquired before version upgrade was performed. The following table explains how to perform a version downgrade depending on whether a full backup of the database was acquired.
|
No. |
Whether a full backup of the database was acquired |
Version downgrading method |
|---|---|---|
|
1 |
Y |
The backup of the previous version of the database is used to perform the version downgrade. For details, see 8.7.1 Using a backup of the previous version of the database. |
|
2 |
N |
The database must be rebuilt on the previous version of HADB server because a backup of the previous version of database was not acquired. For details, see 8.7.2 Rebuilding the database by using the previous version. |
- Legend:
-
Y: A full backup was acquired.
N: A full backup was not acquired.
- Note
-
For details about how to back up the database, see 10.3 Backing up a database. If you are using the multi-node function, see 16.8 Backing up a database (when the multi-node function is being used). If HADB server is in a cold standby configuration, see 17.6 Backing up a database (in the case of the cold standby configuration).