Asynchronous I/O in DuckDB: Work, Thread, Work

Documentation Getting Started Installation Quack Remote Protocol Guides Data Import Client APIs SQL Introduction Why DuckDB Resources Blog Library Events Everywhere Webshop Design FAQ GitHub 39.9k Support Support Asynchronous I/O in…

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Documentation Getting Started Installation Quack Remote Protocol Guides Data Import Client APIs SQL Introduction Why DuckDB Resources Blog Library Events Everywhere Webshop Design FAQ GitHub 39.9k Support Support Asynchronous I/O in DuckDB: Work, Thread, Work Pedro Holanda 2026-07-31 · 21 min TL;DR: Starting with v2.0, scheduled for fall 2026, DuckDB will support asynchronous reads of Parquet and CSV files. This can significantly speed up queries when synchronous I/O does not saturate the available bandwidth, as is typical in EC2/S3 compute-storage setups.

It doesn't matter how fast query operators are in a database system if we can't pull in the data quickly. For most of DuckDB's history, however, this problem was largely avoided by pruning data early. By pushing down filters and…

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