DBID is Zero?

DBID is Generated by Configuration Server in the following link
https://docs.genesys.com/Documentation/PSDK/9.0.x/ConfigLayerRef/CfgTenant

Sorry for my question but I want to confirm that DBID is always greater than 0.
Please show me document about this. Thanks.

Yes, DBIS is never equal to “0”

The Environment tenant is the only object that has a dbid under 100. There are constraints within the database to prevent an empty dbid value, so it will never happen.