These settings configure the ClickHouse server and are autogenerated from ClickHouse source.
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.
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.
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.
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.
http_connections_store_limit
Connections above this limit reset after 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.
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 July 23, 2026
