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These settings configure the ClickHouse server and are autogenerated from ClickHouse source.

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http_connections_hard_limit

Exception is thrown at a creation attempt when this limit is reached. Set to 0 to turn off hard limitation. The limit applies to the http connections which do not belong to any disk or storage.

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http_connections_rcvbuf

The size of the SO_RCVBUF option for general HTTP connections. If set to a value greater than 0, overrides the kernel TCP autotuning for the receive buffer. 0 = kernel default (autotuning). Note: changing this setting back to 0 restores autotuning only for newly created connections; existing pooled connections retain fixed buffer sizes until they are recreated.

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http_connections_sndbuf

The size of the SO_SNDBUF option for general HTTP connections. If set to a value greater than 0, overrides the kernel TCP autotuning for the send buffer. 0 = kernel default (autotuning). Note: changing this setting back to 0 restores autotuning only for newly created connections; existing pooled connections retain fixed buffer sizes until they are recreated.

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http_connections_soft_limit

Connections above this limit have significantly shorter time to live. The limit applies to the http connections which do not belong to any disk or storage.

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http_connections_store_limit

The maximum number of idle connections kept in the pool for reuse. Once this many connections are stored, further connections are reset after use instead of being kept. The limit does not bound the connections in use. Set to 0 to turn connection cache off. The limit applies to the http connections which do not belong to any disk or storage.

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http_connections_warn_limit

Warning massages are written to the logs if number of in-use connections are higher than this limit. The limit applies to the http connections which do not belong to any disk or storage.
Last modified on September 11, 2026