through its standard output.

</para>

<para>

<replaceable>argument</> can be either a text constant or a

<para><replaceable>argument</> can be either a text constant or a

<literal>:</><replaceable>variablename</> reference to a variable of

any types. If you want to use <replaceable>argument</> starting with

colons, you need to add an additional colon at the beginning of

directory output format because this is the only output format where multiple processes

can write their data at the same time.

</para>

<para>

<application>pg_dump</> will open <replaceable class="parameter">njobs</replaceable>

<para><application>pg_dump</> will open <replaceable class="parameter">njobs</replaceable>

+ 1 connections to the database, so make sure your <xref linkend="guc-max-connections">

setting is high enough to accommodate all connections.

</para>

<para>

Standard Usage:

<screen>

<prompt>$</prompt> <userinput>pg_isready</userinput>

<computeroutput>/tmp:5432 - accepting connections</computeroutput>

<prompt>$</prompt> <userinput>echo $?</userinput>

<computeroutput>0</computeroutput>

</screen>

<screen>

<prompt>$</prompt> <userinput>pg_isready</userinput>

<computeroutput>/tmp:5432 - accepting connections</computeroutput>

<prompt>$</prompt> <userinput>echo $?</userinput>

<computeroutput>0</computeroutput>

</screen>

</para>

<para>

Running with connection parameters to a <productname>PostgreSQL</productname> cluster in startup:

<screen>

<prompt>$ </prompt><userinput>pg_isready -h localhost -p 5433</userinput>

<computeroutput>localhost:5433 - rejecting connections</computeroutput>

<prompt>$</prompt> <userinput>echo $?</userinput>

<computeroutput>1</computeroutput>

</screen>

<screen>

<prompt>$ </prompt><userinput>pg_isready -h localhost -p 5433</userinput>

<computeroutput>localhost:5433 - rejecting connections</computeroutput>

<prompt>$</prompt> <userinput>echo $?</userinput>

<computeroutput>1</computeroutput>

</screen>

</para>

<para>

Running with connection parameters to a non-responsive <productname>PostgreSQL</productname> cluster:

<screen>

<prompt>$ </prompt><userinput>pg_isready -h someremotehost</userinput>

<computeroutput>someremotehost:5432 - no response</computeroutput>

<prompt>$</prompt> <userinput>echo $?</userinput>

<computeroutput>2</computeroutput>

</screen>

<screen>

<prompt>$ </prompt><userinput>pg_isready -h someremotehost</userinput>

<computeroutput>someremotehost:5432 - no response</computeroutput>

<prompt>$</prompt> <userinput>echo $?</userinput>

<computeroutput>2</computeroutput>

</screen>

</para>

</refsect1>