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Asynchronous INSERTs are available in the open-source ClickHouse version and in ClickHouse Cloud. The feature is independent of the Cloud.

To enable asynchronous INSERTs, set `async_insert` to true.

Here is the documentation: https://clickhouse.com/docs/en/optimize/asynchronous-inserts ; intro: https://clickhouse.com/blog/asynchronous-data-inserts-in-cli... and a hands-on guide: https://clickhouse.com/blog/monitoring-asynchronous-data-ins...