PostgreSQL version:

tcp_keepalives_interval

Specifies the number of seconds after which a TCP keepalive message that is not acknowledged by the client should be retransmitted. A value of 0 uses the system default. This parameter is supported only on systems that support TCP_KEEPINTVL or an equivalent socket option, and on Windows; on other systems, it must be zero. In sessions connected via a Unix-domain socket, this parameter is ignored and always reads as zero.

On Windows, a value of 0 will set this parameter to 1 second, since Windows does not provide a way to read the system default value.

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