8.4.1.1 When DBTier Failed in All Sites

This section describes how to recover session database when successful data replication corrupts all the cnDBTier sites.

To recover session database, perform the following steps:

1. Uninstall Policy Helm charts on all sites. For more information about uninstalling Helm charts, see Oracle Communication Cloud Native Core, Converged Policy Installation and Upgrade Guide available on MOS.
2. Perform cnDBTier fault recovery procedure:
   1. Use auto-data backup file for restore procedure. For more information about DBTier restore, see Fault Recovery chapter in Oracle Communications Cloud Native Core, cnDBTier Installation and Upgrade Guide available on MOS.
3. Install Policy Helm charts. For more information about installing Helm charts, see Oracle Communication Cloud Native Core, Converged Policy Installation, Upgrade and Fault Recovery Guide available on MOS.

   Note:

   You can also refer to the custom-values.yaml file used at the time of Policy installation for Helm charts installation.