Hello, the developer of db9 here. You’re right, that section is indeed a bit too brief. We will add more architecture documentation later.
What I wanted to convey is that, unlike a standard PostgreSQL, db9 is more like a pg SQL-compatible layer built on top of a large distributed KV store.
I also shared a brief introduction in this tweet, which might help clarify things. https://x.com/dxhuang/status/2032016443114733744
"Compatible" isn't mentioned on the homepage, though, despite multiple opportunities to do so -- "Create, manage and query serverless PostgreSQL", "Run history, status, and metadata live in Postgres", "Full Postgres. Fully typed.".
This lack of detail may cause folks to form the incorrect impression that this is PostgreSQL, or a fork of it, or some module or plugin for it. Folks will be upset to learn that they were misinformed. Some will assign deception as the cause, whether that is true or not.
I think your interests would be best served by trying to make that distinction clear and prominently so. So for example "A PostgreSQL-compatible, fully serverless database", or similar.
it has nothing to do with TiDB, db9 is built from scratch.A good way to think about it is that db9 is similar to tidb-server, it provides a PostgreSQL wire protocol and SQL layer, while the actual data lives in the underlying KV layer.
If it is based on TiKV, why is it built from scratch when TiDB exists? To achieve faster boot times? I think the bigger offering here is distributed-, not serverless Postgres!
