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The documentation stated that existing connections would continue to function normally after the OOM killer terminated the postmaster. In fact, those connections eventually terminate when server processes detect the postmaster's death. Clarify that the OOM killer can terminate either the postmaster or a child process. If the postmaster is killed, the server must be restarted. If a child process is killed, PostgreSQL typically terminates the remaining connections and either recovers automatically or shuts down, depending on restart_after_crash. Backpatch to all supported versions. Author: Takeshi Ideriha <iderihatakeshi@gmail.com> Reviewed-by: Manuel Reyes Bravo <manuelreyesbravo@gmail.com> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/ce269321-a7f4-48f4-a9ca-a4a4983b9fd6@gmail.com Backpatch-through: 14