EDB Postgres Advanced Server is very scalable, so it's an eight out of ten from a scalability point of view.

This is a very scalable environment both linear, horizontally and vertically.

As far as I know, the only way to scale Postgres is to set up a Patroni cluster. I'm not experienced in adding nodes. That might potentially be another option that can be done without any kind of issue. 

I can say that we have some 2,000 people using the Postgres solution and if we had to scale, I am sure we can find a way to do it.

Right now our architecture is scaled to 12 nodes. Or it is a six-plus-six node setup. The bandwidth is run one-at-a-time and is not maintained at a maximum level so we maintain performance.

For the purposes that we use the product for it has expected scalability. In our situation, we will not use this database, as far as I know, to work in a cluster. For what we use the system for, it just performs like a normal database. It is working on an x86 processor and we don't need it to do more. We do not have any problem with scalability. So we are satisfied with it.  

I am not exactly sure how many users are using this solution through our company and deployments. This solution is used to process some kinds of requests from our customers. I think we have used this solution for some of our internet banking. It is probably as many as one million users registered in the system and probably eight or ten TPS (transactions per second) for the database.  

We have just two DBAs from our side doing the maintenance of this solution.  

The database has been able to support about three million taxpayers.