DuckDB shows a database with no data: a few hundred KB catalog over your data lake
RexDouglass · x · 2026-10-08
DuckDB's official blog demonstrates an idea from Nikolas Goebel: a database file needs no data at all — only view definitions pointing at Parquet files on object storage.
- The file stays a few hundred KB yet acts as a shared catalog over an entire data lake; attach it and every named relation is ready to query
- Views encode joins, filters, and column names, forming a publishable semantic layer over raw storage
- Framing: modern databases have split where data lives from how it's read — DuckDB becomes a browser for the data cloud, accessing datasets by URL instead of local copies
- The post walks through building, hosting, and read-only attaching such a catalog
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