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Commita806b14

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Update documentation about SIGKILL of postmaster.
Removing shared memory and semaphores in response to server startfailure often masks the real problem, a live process associated with thedata directory; see commit5a90740.Since 9.6, it's rarely necessary to kill subprocesses manually. (Whenit is necessary, that commit's HINT will say as much, in all supportedversions.)
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‎doc/src/sgml/runtime.sgml‎

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@@ -1685,14 +1685,12 @@ $ <userinput>kill -INT `head -1 /usr/local/pgsql/data/postmaster.pid`</userinput
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<important>
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<para>
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It is best not to use <systemitem>SIGKILL</systemitem> to shut down
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the server. Doing so will prevent the server from releasing
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shared memory and semaphores, which might then have to be done
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manually before a new server can be started. Furthermore,
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<systemitem>SIGKILL</systemitem> kills the <command>postgres</command>
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process without letting it relay the signal to its subprocesses,
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so it will be necessary to kill the individual subprocesses by hand as
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well.
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It is best not to use <systemitem>SIGKILL</systemitem> to shut down the
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server. Doing so will prevent the server from releasing shared memory and
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semaphores. Furthermore, <systemitem>SIGKILL</systemitem> kills
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the <command>postgres</command> process without letting it relay the
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signal to its subprocesses, so it might be necessary to kill the
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individual subprocesses by hand as well.
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</para>
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</important>
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