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Re:Hctree is an experimental high-concurrency database back ... by samuel on Thursday January 19, 2023 @06:41AM (#34439266)
Duckdb should be compatible with postgres to a high degree.

https://duckdb.org/why_duckdb.html

> SQL Parser: We use the PostgreSQL parser that was repackaged as a stand-alone library. The translation to our own parse tree is inspired by Peloton.

Re:Hctree is an experimental high-concurrency database back ... by pbowyer on Thursday January 19, 2023 @07:32AM (#34439622)
Watch out with DuckDB that if you have an open reader you can't open a writer. A writer must be the only connection.

https://duckdb.org/faq#how-does-duckdb-handle-concurrency