If you are using the OEM PostgreSQL database in ZENworks 2017 Update x, then ensure that you migrate to an external PostgreSQL database before upgrading your zone to ZENworks 2020.
Using the database migration script, you can migrate the database. The script file can be downloaded from the following locations:
Download the OEM PostgreSQL to External PostgreSQL Migration script
Depending on the platform, you can download the script file, and then perform the following steps to migrate to an external PostgreSQL database: