Connection limits ​

Connection limits are server-only XML options shared by native TCP and HTTP. Database SET and SHOW SETTINGS do not manage or list them.

Defaults ​

Setting	Default	Contract
max_connections	128	Positive concurrent connection limit.
max_inflight_request_bytes	67,108,864	Positive limit on admitted incoming request bytes.
request_read_timeout	5 seconds	Positive socket timeout; fractional seconds are accepted.

Native request timing ​

A native login must complete within the receive timeout. After authentication, an idle session can wait between requests: the next ordinary request deadline starts when its first byte arrives.

Occasional additional bytes do not restart that ordinary request deadline. Socket writes also use the configured timeout.

HTTP and uploads ​

HTTP bounds complete headers and ordinary bodies, and each upload body frame. Upload support does not remove header or timeout limits.

See admission limits, native TCP and HTTP for the resulting client behavior.