The upgrade to IBM Cloud Pak for Data v4.7 required an export and import of governance data because the underlying metadata repository for Watson Knowledge Catalog (WKC), known as XMETA, underwent significant changes. This repository, which is based on a Db2 database, had its schema and structure altered in a way that was incompatible with a direct, in-place upgrade from previous versions. To accommodate these changes and ensure data integrity, the existing governance artifacts had to be extracted from the old repository structure and then imported into the newly structured repository post-upgrade.

A. Containers are ephemeral, but stateful applications like WKC use persistent volumes for data persistence. This is not the reason for the specific export/import requirement.

C. While the product evolves, the direct technical driver for this specific data migration task was the change in the data store, not the removal of components.

D. Catalog data is already managed on persistent storage (Persistent Volumes) in Cloud Pak for Data. The procedure was a migration, not an initial move to persistence.

1. IBM Cloud Pak for Data 4.7.0 Documentation

"Upgrading Watson Knowledge Catalog": The documentation for upgrading from version 4.6 to 4.7 explicitly states

"The upgrade process for Watson Knowledge Catalog includes backing up the Watson Knowledge Catalog data and restoring it to a new metadata repository." This confirms the creation of a new

altered repository

necessitating the export/import process. (Reference: IBM Documentation

Cloud Pak for Data 4.7

Upgrading > Upgrading from Version 4.6 > Upgrading services > Watson Knowledge Catalog

"Before you begin" section).

2. IBM Cloud Pak for Data 4.7.0 Documentation

"Exporting data from Watson Knowledge Catalog": This section details the wkc-import-export utility used for the migration. The documentation notes its use for "backing up and restoring or migrating Watson Knowledge Catalog assets between clusters of the same version or for the upgrade process." The need for such a utility during an upgrade points to underlying structural changes that prevent a simple automated data upgrade. (Reference: IBM Documentation

Cloud Pak for Data 4.7

Administering > Backing up and restoring > Exporting data from Watson Knowledge Catalog).