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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>pg_recvlogical</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="app-pgreceivewal.html" title="pg_receivewal" /><link rel="next" href="app-pgrestore.html" title="pg_restore" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center"><span class="application">pg_recvlogical</span></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="app-pgreceivewal.html" title="pg_receivewal">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="reference-client.html" title="PostgreSQL Client Applications">Up</a></td><th width="60%" align="center">PostgreSQL Client Applications</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="app-pgrestore.html" title="pg_restore">Next</a></td></tr></table><hr /></div><div class="refentry" id="APP-PGRECVLOGICAL"><div class="titlepage"></div><a id="id-1.9.4.17.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle"><span class="application">pg_recvlogical</span></span></h2><p>pg_recvlogical — control <span class="productname">PostgreSQL</span> logical decoding streams</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p id="id-1.9.4.17.4.1"><code class="command">pg_recvlogical</code> [<em class="replaceable"><code>option</code></em>...]</p></div></div><div class="refsect1" id="id-1.9.4.17.5"><h2>Description</h2><p>
+ <code class="command">pg_recvlogical</code> controls logical decoding replication
+ slots and streams data from such replication slots.
+ </p><p>
+ It creates a replication-mode connection, so it is subject to the same
+ constraints as <a class="xref" href="app-pgreceivewal.html" title="pg_receivewal"><span class="refentrytitle"><span class="application">pg_receivewal</span></span></a>, plus those for logical
+ replication (see <a class="xref" href="logicaldecoding.html" title="Chapter 49. Logical Decoding">Chapter 49</a>).
+ </p><p>
+ <code class="command">pg_recvlogical</code> has no equivalent to the logical decoding
+ SQL interface's peek and get modes. It sends replay confirmations for
+ data lazily as it receives it and on clean exit. To examine pending data on
+ a slot without consuming it, use
+ <a class="link" href="functions-admin.html#FUNCTIONS-REPLICATION" title="9.27.6. Replication Management Functions"><code class="function">pg_logical_slot_peek_changes</code></a>.
+ </p></div><div class="refsect1" id="id-1.9.4.17.6"><h2>Options</h2><p>
+ At least one of the following options must be specified to select an action:
+
+ </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="option">--create-slot</code></span></dt><dd><p>
+ Create a new logical replication slot with the name specified by
+ <code class="option">--slot</code>, using the output plugin specified by
+ <code class="option">--plugin</code>, for the database specified
+ by <code class="option">--dbname</code>.
+ </p><p>
+ The <code class="option">--two-phase</code> can be specified with
+ <code class="option">--create-slot</code> to enable decoding of prepared transactions.
+ </p></dd><dt><span class="term"><code class="option">--drop-slot</code></span></dt><dd><p>
+ Drop the replication slot with the name specified
+ by <code class="option">--slot</code>, then exit.
+ </p></dd><dt><span class="term"><code class="option">--start</code></span></dt><dd><p>
+ Begin streaming changes from the logical replication slot specified
+ by <code class="option">--slot</code>, continuing until terminated by a
+ signal. If the server side change stream ends with a server shutdown
+ or disconnect, retry in a loop unless
+ <code class="option">--no-loop</code> is specified.
+ </p><p>
+ The stream format is determined by the output plugin specified when
+ the slot was created.
+ </p><p>
+ The connection must be to the same database used to create the slot.
+ </p></dd></dl></div><p>
+ </p><p>
+ <code class="option">--create-slot</code> and <code class="option">--start</code> can be
+ specified together. <code class="option">--drop-slot</code> cannot be combined with
+ another action.
+ </p><p>
+ The following command-line options control the location and format of the
+ output and other replication behavior:
+
+ </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="option">-E <em class="replaceable"><code>lsn</code></em></code><br /></span><span class="term"><code class="option">--endpos=<em class="replaceable"><code>lsn</code></em></code></span></dt><dd><p>
+ In <code class="option">--start</code> mode, automatically stop replication
+ and exit with normal exit status 0 when receiving reaches the
+ specified LSN. If specified when not in <code class="option">--start</code>
+ mode, an error is raised.
+ </p><p>
+ If there's a record with LSN exactly equal to <em class="replaceable"><code>lsn</code></em>,
+ the record will be output.
+ </p><p>
+ The <code class="option">--endpos</code> option is not aware of transaction
+ boundaries and may truncate output partway through a transaction.
+ Any partially output transaction will not be consumed and will be
+ replayed again when the slot is next read from. Individual messages
+ are never truncated.
+ </p></dd><dt><span class="term"><code class="option">-f <em class="replaceable"><code>filename</code></em></code><br /></span><span class="term"><code class="option">--file=<em class="replaceable"><code>filename</code></em></code></span></dt><dd><p>
+ Write received and decoded transaction data into this
+ file. Use <code class="literal">-</code> for <span class="systemitem">stdout</span>.
+ </p></dd><dt><span class="term"><code class="option">-F <em class="replaceable"><code>interval_seconds</code></em></code><br /></span><span class="term"><code class="option">--fsync-interval=<em class="replaceable"><code>interval_seconds</code></em></code></span></dt><dd><p>
+ Specifies how often <span class="application">pg_recvlogical</span> should
+ issue <code class="function">fsync()</code> calls to ensure the output file is
+ safely flushed to disk.
+ </p><p>
+ The server will occasionally request the client to perform a flush and
+ report the flush position to the server. This setting is in addition
+ to that, to perform flushes more frequently.
+ </p><p>
+ Specifying an interval of <code class="literal">0</code> disables
+ issuing <code class="function">fsync()</code> calls altogether, while still
+ reporting progress to the server. In this case, data could be lost in
+ the event of a crash.
+ </p></dd><dt><span class="term"><code class="option">-I <em class="replaceable"><code>lsn</code></em></code><br /></span><span class="term"><code class="option">--startpos=<em class="replaceable"><code>lsn</code></em></code></span></dt><dd><p>
+ In <code class="option">--start</code> mode, start replication from the given
+ LSN. For details on the effect of this, see the documentation
+ in <a class="xref" href="logicaldecoding.html" title="Chapter 49. Logical Decoding">Chapter 49</a>
+ and <a class="xref" href="protocol-replication.html" title="55.4. Streaming Replication Protocol">Section 55.4</a>. Ignored in other modes.
+ </p></dd><dt><span class="term"><code class="option">--if-not-exists</code></span></dt><dd><p>
+ Do not error out when <code class="option">--create-slot</code> is specified
+ and a slot with the specified name already exists.
+ </p></dd><dt><span class="term"><code class="option">-n</code><br /></span><span class="term"><code class="option">--no-loop</code></span></dt><dd><p>
+ When the connection to the server is lost, do not retry in a loop, just exit.
+ </p></dd><dt><span class="term"><code class="option">-o <em class="replaceable"><code>name</code></em>[=<em class="replaceable"><code>value</code></em>]</code><br /></span><span class="term"><code class="option">--option=<em class="replaceable"><code>name</code></em>[=<em class="replaceable"><code>value</code></em>]</code></span></dt><dd><p>
+ Pass the option <em class="replaceable"><code>name</code></em> to the output plugin with,
+ if specified, the option value <em class="replaceable"><code>value</code></em>. Which
+ options exist and their effects depends on the used output plugin.
+ </p></dd><dt><span class="term"><code class="option">-P <em class="replaceable"><code>plugin</code></em></code><br /></span><span class="term"><code class="option">--plugin=<em class="replaceable"><code>plugin</code></em></code></span></dt><dd><p>
+ When creating a slot, use the specified logical decoding output
+ plugin. See <a class="xref" href="logicaldecoding.html" title="Chapter 49. Logical Decoding">Chapter 49</a>. This option has no
+ effect if the slot already exists.
+ </p></dd><dt><span class="term"><code class="option">-s <em class="replaceable"><code>interval_seconds</code></em></code><br /></span><span class="term"><code class="option">--status-interval=<em class="replaceable"><code>interval_seconds</code></em></code></span></dt><dd><p>
+ This option has the same effect as the option of the same name
+ in <a class="xref" href="app-pgreceivewal.html" title="pg_receivewal"><span class="refentrytitle"><span class="application">pg_receivewal</span></span></a>. See the description there.
+ </p></dd><dt><span class="term"><code class="option">-S <em class="replaceable"><code>slot_name</code></em></code><br /></span><span class="term"><code class="option">--slot=<em class="replaceable"><code>slot_name</code></em></code></span></dt><dd><p>
+ In <code class="option">--start</code> mode, use the existing logical replication slot named
+ <em class="replaceable"><code>slot_name</code></em>. In <code class="option">--create-slot</code>
+ mode, create the slot with this name. In <code class="option">--drop-slot</code>
+ mode, delete the slot with this name.
+ </p></dd><dt><span class="term"><code class="option">-t</code><br /></span><span class="term"><code class="option">--two-phase</code></span></dt><dd><p>
+ Enables decoding of prepared transactions. This option may only be specified with
+ <code class="option">--create-slot</code>
+ </p></dd><dt><span class="term"><code class="option">-v</code><br /></span><span class="term"><code class="option">--verbose</code></span></dt><dd><p>
+ Enables verbose mode.
+ </p></dd></dl></div><p>
+ </p><p>
+ The following command-line options control the database connection parameters.
+
+ </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="option">-d <em class="replaceable"><code>dbname</code></em></code><br /></span><span class="term"><code class="option">--dbname=<em class="replaceable"><code>dbname</code></em></code></span></dt><dd><p>
+ The database to connect to. See the description
+ of the actions for what this means in detail.
+ The <em class="replaceable"><code>dbname</code></em> can be a <a class="link" href="libpq-connect.html#LIBPQ-CONNSTRING" title="34.1.1. Connection Strings">connection string</a>. If so,
+ connection string parameters will override any conflicting
+ command line options. Defaults to the user name.
+ </p></dd><dt><span class="term"><code class="option">-h <em class="replaceable"><code>hostname-or-ip</code></em></code><br /></span><span class="term"><code class="option">--host=<em class="replaceable"><code>hostname-or-ip</code></em></code></span></dt><dd><p>
+ Specifies the host name of the machine on which the server is
+ running. If the value begins with a slash, it is used as the
+ directory for the Unix domain socket. The default is taken
+ from the <code class="envar">PGHOST</code> environment variable, if set,
+ else a Unix domain socket connection is attempted.
+ </p></dd><dt><span class="term"><code class="option">-p <em class="replaceable"><code>port</code></em></code><br /></span><span class="term"><code class="option">--port=<em class="replaceable"><code>port</code></em></code></span></dt><dd><p>
+ Specifies the TCP port or local Unix domain socket file
+ extension on which the server is listening for connections.
+ Defaults to the <code class="envar">PGPORT</code> environment variable, if
+ set, or a compiled-in default.
+ </p></dd><dt><span class="term"><code class="option">-U <em class="replaceable"><code>user</code></em></code><br /></span><span class="term"><code class="option">--username=<em class="replaceable"><code>user</code></em></code></span></dt><dd><p>
+ User name to connect as. Defaults to current operating system user
+ name.
+ </p></dd><dt><span class="term"><code class="option">-w</code><br /></span><span class="term"><code class="option">--no-password</code></span></dt><dd><p>
+ Never issue a password prompt. If the server requires
+ password authentication and a password is not available by
+ other means such as a <code class="filename">.pgpass</code> file, the
+ connection attempt will fail. This option can be useful in
+ batch jobs and scripts where no user is present to enter a
+ password.
+ </p></dd><dt><span class="term"><code class="option">-W</code><br /></span><span class="term"><code class="option">--password</code></span></dt><dd><p>
+ Force <span class="application">pg_recvlogical</span> to prompt for a
+ password before connecting to a database.
+ </p><p>
+ This option is never essential, since
+ <span class="application">pg_recvlogical</span> will automatically prompt
+ for a password if the server demands password authentication.
+ However, <span class="application">pg_recvlogical</span> will waste a
+ connection attempt finding out that the server wants a password.
+ In some cases it is worth typing <code class="option">-W</code> to avoid the extra
+ connection attempt.
+ </p></dd></dl></div><p>
+ </p><p>
+ The following additional options are available:
+
+ </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="option">-V</code><br /></span><span class="term"><code class="option">--version</code></span></dt><dd><p>
+ Print the <span class="application">pg_recvlogical</span> version and exit.
+ </p></dd><dt><span class="term"><code class="option">-?</code><br /></span><span class="term"><code class="option">--help</code></span></dt><dd><p>
+ Show help about <span class="application">pg_recvlogical</span> command line
+ arguments, and exit.
+ </p></dd></dl></div><p>
+ </p></div><div class="refsect1" id="id-1.9.4.17.7"><h2>Environment</h2><p>
+ This utility, like most other <span class="productname">PostgreSQL</span> utilities,
+ uses the environment variables supported by <span class="application">libpq</span>
+ (see <a class="xref" href="libpq-envars.html" title="34.15. Environment Variables">Section 34.15</a>).
+ </p><p>
+ The environment variable <code class="envar">PG_COLOR</code> specifies whether to use
+ color in diagnostic messages. Possible values are
+ <code class="literal">always</code>, <code class="literal">auto</code> and
+ <code class="literal">never</code>.
+ </p></div><div class="refsect1" id="id-1.9.4.17.8"><h2>Notes</h2><p>
+ <span class="application">pg_recvlogical</span> will preserve group permissions on
+ the received WAL files if group permissions are enabled on the source
+ cluster.
+ </p></div><div class="refsect1" id="id-1.9.4.17.9"><h2>Examples</h2><p>
+ See <a class="xref" href="logicaldecoding-example.html" title="49.1. Logical Decoding Examples">Section 49.1</a> for an example.
+ </p></div><div class="refsect1" id="id-1.9.4.17.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="app-pgreceivewal.html" title="pg_receivewal"><span class="refentrytitle"><span class="application">pg_receivewal</span></span></a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="app-pgreceivewal.html" title="pg_receivewal">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="reference-client.html" title="PostgreSQL Client Applications">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="app-pgrestore.html" title="pg_restore">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="application">pg_receivewal</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> <span class="application">pg_restore</span></td></tr></table></div></body></html> \ No newline at end of file
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