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cf42550d51
Reported-by: Alexander Lakhin Discussion: https://postgr.es/m/16486-b9c93d71c02c4907@postgresql.org Backpatch-through: 9.5
386 lines
12 KiB
Plaintext
386 lines
12 KiB
Plaintext
<!--
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doc/src/sgml/ref/pg_recvlogical.sgml
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PostgreSQL documentation
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-->
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<refentry id="app-pgrecvlogical">
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<indexterm zone="app-pgrecvlogical">
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<primary>pg_recvlogical</primary>
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</indexterm>
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<refmeta>
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<refentrytitle><application>pg_recvlogical</application></refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo>Application</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>pg_recvlogical</refname>
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<refpurpose>control <productname>PostgreSQL</productname> logical decoding streams</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>pg_recvlogical</command>
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<arg rep="repeat" choice="opt"><replaceable>option</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>pg_recvlogical</command> controls logical decoding replication
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slots and streams data from such replication slots.
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</para>
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<para>
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It creates a replication-mode connection, so it is subject to the same
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constraints as <xref linkend="app-pgreceivexlog">, plus those for logical
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replication (see <xref linkend="logicaldecoding">).
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>
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At least one of the following options must be specified to select an action:
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<variablelist>
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<varlistentry>
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<term><option>--create-slot</option></term>
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<listitem>
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<para>
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Create a new logical replication slot with the name specified by
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<option>--slot</option>, using the output plugin specified by
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<option>--plugin</option>, for the database specified
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by <option>--dbname</option>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--drop-slot</option></term>
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<listitem>
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<para>
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Drop the replication slot with the name specified
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by <option>--slot</option>, then exit.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--start</option></term>
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<listitem>
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<para>
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Begin streaming changes from the logical replication slot specified
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by <option>--slot</option>, continuing until terminated by a
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signal. If the server side change stream ends with a server shutdown
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or disconnect, retry in a loop unless
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<option>--no-loop</option> is specified.
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</para>
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<para>
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The stream format is determined by the output plugin specified when
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the slot was created.
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</para>
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<para>
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The connection must be to the same database used to create the slot.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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<option>--create-slot</option> and <option>--start</option> can be
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specified together. <option>--drop-slot</option> cannot be combined with
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another action.
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</para>
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<para>
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The following command-line options control the location and format of the
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output and other replication behavior:
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<variablelist>
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<varlistentry>
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<term><option>-f <replaceable>filename</replaceable></option></term>
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<term><option>--file=<replaceable>filename</replaceable></option></term>
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<listitem>
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<para>
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Write received and decoded transaction data into this
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file. Use <literal>-</> for <systemitem>stdout</systemitem>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-F <replaceable>interval_seconds</replaceable></option></term>
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<term><option>--fsync-interval=<replaceable>interval_seconds</replaceable></option></term>
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<listitem>
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<para>
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Specifies how often <application>pg_recvlogical</application> should
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issue <function>fsync()</function> calls to ensure the output file is
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safely flushed to disk.
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</para>
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<para>
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The server will occasionally request the client to perform a flush and
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report the flush position to the server. This setting is in addition
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to that, to perform flushes more frequently.
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</para>
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<para>
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Specifying an interval of <literal>0</literal> disables
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issuing <function>fsync()</function> calls altogether, while still
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reporting progress to the server. In this case, data could be lost in
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the event of a crash.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-I <replaceable>lsn</replaceable></option></term>
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<term><option>--startpos=<replaceable>lsn</replaceable></option></term>
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<listitem>
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<para>
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In <option>--start</option> mode, start replication from the given
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LSN. For details on the effect of this, see the documentation
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in <xref linkend="logicaldecoding">
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and <xref linkend="protocol-replication">. Ignored in other modes.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--if-not-exists</option></term>
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<listitem>
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<para>
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Do not error out when <option>--create-slot</option> is specified
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and a slot with the specified name already exists.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-n</option></term>
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<term><option>--no-loop</option></term>
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<listitem>
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<para>
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When the connection to the server is lost, do not retry in a loop, just exit.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-o <replaceable>name</replaceable>[=<replaceable>value</replaceable>]</option></term>
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<term><option>--option=<replaceable>name</replaceable>[=<replaceable>value</replaceable>]</option></term>
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<listitem>
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<para>
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Pass the option <replaceable>name</replaceable> to the output plugin with,
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if specified, the option value <replaceable>value</replaceable>. Which
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options exist and their effects depends on the used output plugin.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-P <replaceable>plugin</replaceable></option></term>
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<term><option>--plugin=<replaceable>plugin</replaceable></option></term>
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<listitem>
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<para>
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When creating a slot, use the specified logical decoding output
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plugin. See <xref linkend="logicaldecoding">. This option has no
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effect if the slot already exists.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-s <replaceable>interval_seconds</replaceable></option></term>
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<term><option>--status-interval=<replaceable>interval_seconds</replaceable></option></term>
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<listitem>
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<para>
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This option has the same effect as the option of the same name
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in <xref linkend="app-pgreceivexlog">. See the description there.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-S <replaceable>slot_name</replaceable></option></term>
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<term><option>--slot=<replaceable>slot_name</replaceable></option></term>
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<listitem>
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<para>
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In <option>--start</option> mode, use the existing logical replication slot named
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<replaceable>slot_name</replaceable>. In <option>--create-slot</option>
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mode, create the slot with this name. In <option>--drop-slot</option>
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mode, delete the slot with this name.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-v</></term>
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<term><option>--verbose</></term>
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<listitem>
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<para>
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Enables verbose mode.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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The following command-line options control the database connection parameters.
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<variablelist>
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<varlistentry>
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<term><option>-d <replaceable>dbname</replaceable></option></term>
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<term><option>--dbname=<replaceable>dbname</replaceable></option></term>
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<listitem>
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<para>
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The database to connect to. See the description
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of the actions for what this means in detail.
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The <replaceable>dbname</replaceable> can be a <link
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linkend="libpq-connstring">connection string</link>. If so,
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connection string parameters will override any conflicting
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command line options. Defaults to the user name.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-h <replaceable>hostname-or-ip</replaceable></option></term>
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<term><option>--host=<replaceable>hostname-or-ip</replaceable></option></term>
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<listitem>
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<para>
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Specifies the host name of the machine on which the server is
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running. If the value begins with a slash, it is used as the
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directory for the Unix domain socket. The default is taken
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from the <envar>PGHOST</envar> environment variable, if set,
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else a Unix domain socket connection is attempted.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-p <replaceable>port</replaceable></option></term>
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<term><option>--port=<replaceable>port</replaceable></option></term>
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<listitem>
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<para>
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Specifies the TCP port or local Unix domain socket file
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extension on which the server is listening for connections.
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Defaults to the <envar>PGPORT</envar> environment variable, if
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set, or a compiled-in default.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-U <replaceable>user</replaceable></option></term>
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<term><option>--username=<replaceable>user</replaceable></option></term>
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<listitem>
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<para>
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User name to connect as. Defaults to current operating system user
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name.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-w</option></term>
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<term><option>--no-password</option></term>
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<listitem>
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<para>
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Never issue a password prompt. If the server requires
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password authentication and a password is not available by
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other means such as a <filename>.pgpass</filename> file, the
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connection attempt will fail. This option can be useful in
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batch jobs and scripts where no user is present to enter a
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password.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-W</option></term>
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<term><option>--password</option></term>
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<listitem>
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<para>
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Force <application>pg_recvlogical</application> to prompt for a
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password before connecting to a database.
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</para>
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<para>
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This option is never essential, since
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<application>pg_recvlogical</application> will automatically prompt
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for a password if the server demands password authentication.
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However, <application>pg_recvlogical</application> will waste a
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connection attempt finding out that the server wants a password.
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In some cases it is worth typing <option>-W</> to avoid the extra
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connection attempt.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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The following additional options are available:
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<variablelist>
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<varlistentry>
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<term><option>-V</></term>
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<term><option>--version</></term>
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<listitem>
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<para>
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Print the <application>pg_recvlogical</application> version and exit.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-?</></term>
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<term><option>--help</></term>
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<listitem>
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<para>
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Show help about <application>pg_recvlogical</application> command line
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arguments, and exit.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1>
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<title>Environment</title>
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<para>
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This utility, like most other <productname>PostgreSQL</> utilities,
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uses the environment variables supported by <application>libpq</>
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(see <xref linkend="libpq-envars">).
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</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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See <xref linkend="logicaldecoding-example"> for an example.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="app-pgreceivexlog"></member>
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</simplelist>
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</refsect1>
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</refentry>
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