For each PPM client, you need a single schema of a dedicated database user. The database user requires unrestricted access to the objects of their schema.
How to create such a DB user for the supported database systems is described in detail in the corresponding sections of the supported databases.
In the database-specific <RDBMS>_USE_CASE_SENSITIVE_USERNAME key of the client-specific Database_settings.properties configuration file, you can specify if the database system is to consider case-sensitive spelling of user names (value true) or not (value false). The default value is false.