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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>F.1. adminpack</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 V1.79.1" /><link rel="prev" href="contrib.html" title="Appendix F. Additional Supplied Modules" /><link rel="next" href="amcheck.html" title="F.2. amcheck" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">F.1. adminpack</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="contrib.html" title="Appendix F. Additional Supplied Modules">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules">Up</a></td><th width="60%" align="center">Appendix F. Additional Supplied Modules</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 13.1 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="amcheck.html" title="F.2. amcheck">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="ADMINPACK"><div class="titlepage"><div><div><h2 class="title" style="clear: both">F.1. adminpack</h2></div></div></div><a id="id-1.11.7.10.2" class="indexterm"></a><p>
  <code class="filename">adminpack</code> provides a number of support functions which
  <span class="application">pgAdmin</span> and other administration and management tools can
  use to provide additional functionality, such as remote management
  of server log files.
  Use of all these functions is only allowed to the superuser by default but may be
  allowed to other users by using the <code class="command">GRANT</code> command.
 </p><p>
  The functions shown in <a class="xref" href="adminpack.html#FUNCTIONS-ADMINPACK-TABLE" title="Table F.1. adminpack Functions">Table F.1</a> provide
  write access to files on the machine hosting the server.  (See also the
  functions in <a class="xref" href="functions-admin.html#FUNCTIONS-ADMIN-GENFILE-TABLE" title="Table 9.95. Generic File Access Functions">Table 9.95</a>, which
  provide read-only access.)
  Only files within the database cluster directory can be accessed, unless the
  user is a superuser or given one of the pg_read_server_files, or pg_write_server_files
  roles, as appropriate for the function, but either a relative or absolute path is
  allowable.
 </p><div class="table" id="FUNCTIONS-ADMINPACK-TABLE"><p class="title"><strong>Table F.1. <code class="filename">adminpack</code> Functions</strong></p><div class="table-contents"><table class="table" summary="adminpack Functions" border="1"><colgroup><col /></colgroup><thead><tr><th class="func_table_entry"><p class="func_signature">
        Function
       </p>
       <p>
        Description
       </p></th></tr></thead><tbody><tr><td class="func_table_entry"><p class="func_signature">
        <code class="function">pg_catalog.pg_file_write</code> ( <em class="parameter"><code>filename</code></em> <code class="type">text</code>, <em class="parameter"><code>data</code></em> <code class="type">text</code>, <em class="parameter"><code>append</code></em> <code class="type">boolean</code> )
        → <code class="returnvalue">bigint</code>
       </p>
       <p>
        Writes, or appends to, a text file.
       </p></td></tr><tr><td class="func_table_entry"><p class="func_signature">
        <code class="function">pg_catalog.pg_file_sync</code> ( <em class="parameter"><code>filename</code></em> <code class="type">text</code> )
        → <code class="returnvalue">void</code>
       </p>
       <p>
        Flushes a file or directory to disk.
       </p></td></tr><tr><td class="func_table_entry"><p class="func_signature">
        <code class="function">pg_catalog.pg_file_rename</code> ( <em class="parameter"><code>oldname</code></em> <code class="type">text</code>, <em class="parameter"><code>newname</code></em> <code class="type">text</code> [<span class="optional">, <em class="parameter"><code>archivename</code></em> <code class="type">text</code> </span>] )
        → <code class="returnvalue">boolean</code>
       </p>
       <p>
        Renames a file.
       </p></td></tr><tr><td class="func_table_entry"><p class="func_signature">
        <code class="function">pg_catalog.pg_file_unlink</code> ( <em class="parameter"><code>filename</code></em> <code class="type">text</code> )
        → <code class="returnvalue">boolean</code>
       </p>
       <p>
        Removes a file.
       </p></td></tr><tr><td class="func_table_entry"><p class="func_signature">
        <code class="function">pg_catalog.pg_logdir_ls</code> ()
        → <code class="returnvalue">setof record</code>
       </p>
       <p>
        Lists the log files in the <code class="varname">log_directory</code> directory.
       </p></td></tr></tbody></table></div></div><br class="table-break" /><a id="id-1.11.7.10.6" class="indexterm"></a><p>
  <code class="function">pg_file_write</code> writes the specified <em class="parameter"><code>data</code></em> into
  the file named by <em class="parameter"><code>filename</code></em>.  If <em class="parameter"><code>append</code></em> is
  false, the file must not already exist.  If <em class="parameter"><code>append</code></em> is true,
  the file can already exist, and will be appended to if so.
  Returns the number of bytes written.
 </p><a id="id-1.11.7.10.8" class="indexterm"></a><p>
  <code class="function">pg_file_sync</code> fsyncs the specified file or directory
  named by <em class="parameter"><code>filename</code></em>.  An error is thrown
  on failure (e.g., the specified file is not present). Note that
  <a class="xref" href="runtime-config-error-handling.html#GUC-DATA-SYNC-RETRY">data_sync_retry</a> has no effect on this function,
  and therefore a PANIC-level error will not be raised even on failure to
  flush database files.
 </p><a id="id-1.11.7.10.10" class="indexterm"></a><p>
  <code class="function">pg_file_rename</code> renames a file.  If <em class="parameter"><code>archivename</code></em>
  is omitted or NULL, it simply renames <em class="parameter"><code>oldname</code></em>
  to <em class="parameter"><code>newname</code></em> (which must not already exist).
  If <em class="parameter"><code>archivename</code></em> is provided, it first
  renames <em class="parameter"><code>newname</code></em> to <em class="parameter"><code>archivename</code></em> (which must
  not already exist), and then renames <em class="parameter"><code>oldname</code></em>
  to <em class="parameter"><code>newname</code></em>.  In event of failure of the second rename step,
  it will try to rename <em class="parameter"><code>archivename</code></em> back
  to <em class="parameter"><code>newname</code></em> before reporting the error.
  Returns true on success, false if the source file(s) are not present or
  not writable; other cases throw errors.
 </p><a id="id-1.11.7.10.12" class="indexterm"></a><p>
  <code class="function">pg_file_unlink</code> removes the specified file.
  Returns true on success, false if the specified file is not present
  or the <code class="function">unlink()</code> call fails; other cases throw errors.
 </p><a id="id-1.11.7.10.14" class="indexterm"></a><p>
  <code class="function">pg_logdir_ls</code> returns the start timestamps and path
  names of all the log files in the <a class="xref" href="runtime-config-logging.html#GUC-LOG-DIRECTORY">log_directory</a>
  directory.  The <a class="xref" href="runtime-config-logging.html#GUC-LOG-FILENAME">log_filename</a> parameter must have its
  default setting (<code class="literal">postgresql-%Y-%m-%d_%H%M%S.log</code>) to use this
  function.
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