Baoding-FenShuaJiang
/
Green_GoodERP18_FSJ_Standard
Watch 1
Star 0
Wiki 捐赠
gooderp18绿色标准版
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Tree: 0f75e31513
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '0f75e31513'
${ noResults }
Green_GoodERP18_FSJ_Standard/PostgreSQL/doc/postgresql/html/pgwaldump.html

72 lines
9.2KB
Raw Blame History 

  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>

  2. <!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_waldump</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="pgupgrade.html" title="pg_upgrade" /><link rel="next" href="app-postgres.html" title="postgres" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center"><span xmlns="http://www.w3.org/1999/xhtml" class="application">pg_waldump</span></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="pgupgrade.html" title="pg_upgrade">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="reference-server.html" title="PostgreSQL Server Applications">Up</a></td><th width="60%" align="center">PostgreSQL Server Applications</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="app-postgres.html" title="postgres">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="PGWALDUMP"><div class="titlepage"></div><a id="id-1.9.5.13.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle"><span class="application">pg_waldump</span></span></h2><p>pg_waldump — display a human-readable rendering of the write-ahead log of a <span class="productname">PostgreSQL</span> database cluster</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p id="id-1.9.5.13.4.1"><code class="command">pg_waldump</code> [<code class="option">option</code>...] [<code class="option">startseg</code> [<code class="option">endseg</code>]]</p></div></div><div class="refsect1" id="R1-APP-PGWALDUMP-1"><h2>Description</h2><p>

  3.    <code class="command">pg_waldump</code> displays the write-ahead log (WAL) and is mainly

  4.    useful for debugging or educational purposes.

  5.   </p><p>

  6.    This utility can only be run by the user who installed the server, because

  7.    it requires read-only access to the data directory.

  8.   </p></div><div class="refsect1" id="id-1.9.5.13.6"><h2>Options</h2><p>

  9.     The following command-line options control the location and format of the

  10.     output:

  11. 

  12.     </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="replaceable"><code>startseg</code></em></span></dt><dd><p>

  13.         Start reading at the specified log segment file.  This implicitly determines

  14.         the path in which files will be searched for, and the timeline to use.

  15.        </p></dd><dt><span class="term"><em class="replaceable"><code>endseg</code></em></span></dt><dd><p>

  16.         Stop after reading the specified log segment file.

  17.        </p></dd><dt><span class="term"><code class="option">-b</code><br /></span><span class="term"><code class="option">--bkp-details</code></span></dt><dd><p>

  18.         Output detailed information about backup blocks.

  19.        </p></dd><dt><span class="term"><code class="option">-e <em class="replaceable"><code>end</code></em></code><br /></span><span class="term"><code class="option">--end=<em class="replaceable"><code>end</code></em></code></span></dt><dd><p>

  20.         Stop reading at the specified WAL location, instead of reading to the

  21.         end of the log stream.

  22.        </p></dd><dt><span class="term"><code class="option">-f</code><br /></span><span class="term"><code class="option">--follow</code></span></dt><dd><p>

  23.         After reaching the end of valid WAL, keep polling once per second for

  24.         new WAL to appear.

  25.        </p></dd><dt><span class="term"><code class="option">-n <em class="replaceable"><code>limit</code></em></code><br /></span><span class="term"><code class="option">--limit=<em class="replaceable"><code>limit</code></em></code></span></dt><dd><p>

  26.         Display the specified number of records, then stop.

  27.        </p></dd><dt><span class="term"><code class="option">-p <em class="replaceable"><code>path</code></em></code><br /></span><span class="term"><code class="option">--path=<em class="replaceable"><code>path</code></em></code></span></dt><dd><p>

  28.         Specifies a directory to search for log segment files or a

  29.         directory with a <code class="literal">pg_wal</code> subdirectory that

  30.         contains such files.  The default is to search in the current

  31.         directory, the <code class="literal">pg_wal</code> subdirectory of the

  32.         current directory, and the <code class="literal">pg_wal</code> subdirectory

  33.         of <code class="envar">PGDATA</code>.

  34.        </p></dd><dt><span class="term"><code class="option">-r <em class="replaceable"><code>rmgr</code></em></code><br /></span><span class="term"><code class="option">--rmgr=<em class="replaceable"><code>rmgr</code></em></code></span></dt><dd><p>

  35.         Only display records generated by the specified resource manager.

  36.         If <code class="literal">list</code> is passed as name, print a list of valid resource manager

  37.         names, and exit.

  38.        </p></dd><dt><span class="term"><code class="option">-s <em class="replaceable"><code>start</code></em></code><br /></span><span class="term"><code class="option">--start=<em class="replaceable"><code>start</code></em></code></span></dt><dd><p>

  39.         WAL location at which to start reading. The default is to start reading

  40.         the first valid log record found in the earliest file found.

  41.        </p></dd><dt><span class="term"><code class="option">-t <em class="replaceable"><code>timeline</code></em></code><br /></span><span class="term"><code class="option">--timeline=<em class="replaceable"><code>timeline</code></em></code></span></dt><dd><p>

  42.         Timeline from which to read log records. The default is to use the

  43.         value in <em class="replaceable"><code>startseg</code></em>, if that is specified; otherwise, the

  44.         default is 1.

  45.        </p></dd><dt><span class="term"><code class="option">-V</code><br /></span><span class="term"><code class="option">--version</code></span></dt><dd><p>

  46.        Print the <span class="application">pg_waldump</span> version and exit.

  47.        </p></dd><dt><span class="term"><code class="option">-x <em class="replaceable"><code>xid</code></em></code><br /></span><span class="term"><code class="option">--xid=<em class="replaceable"><code>xid</code></em></code></span></dt><dd><p>

  48.         Only display records marked with the given transaction ID.

  49.        </p></dd><dt><span class="term"><code class="option">-z</code><br /></span><span class="term"><code class="option">--stats[=record]</code></span></dt><dd><p>

  50.         Display summary statistics (number and size of records and

  51.         full-page images) instead of individual records. Optionally

  52.         generate statistics per-record instead of per-rmgr.

  53.        </p></dd><dt><span class="term"><code class="option">-?</code><br /></span><span class="term"><code class="option">--help</code></span></dt><dd><p>

  54.          Show help about <span class="application">pg_waldump</span> command line

  55.          arguments, and exit.

  56.         </p></dd></dl></div><p>

  57.    </p></div><div class="refsect1" id="id-1.9.5.13.7"><h2>Environment</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="envar">PGDATA</code></span></dt><dd><p>

  58.       Data directory; see also the <code class="option">-p</code> option.

  59.      </p></dd><dt><span class="term"><code class="envar">PG_COLOR</code></span></dt><dd><p>

  60.       Specifies whether to use color in diagnostic messages. Possible values

  61.       are <code class="literal">always</code>, <code class="literal">auto</code> and

  62.       <code class="literal">never</code>.

  63.      </p></dd></dl></div></div><div class="refsect1" id="id-1.9.5.13.8"><h2>Notes</h2><p>

  64.     Can give wrong results when the server is running.

  65.   </p><p>

  66.     Only the specified timeline is displayed (or the default, if none is

  67.     specified). Records in other timelines are ignored.

  68.   </p><p>

  69.     <span class="application">pg_waldump</span> cannot read WAL files with suffix

  70.     <code class="literal">.partial</code>. If those files need to be read, <code class="literal">.partial</code>

  71.     suffix needs to be removed from the file name.

  72.   </p></div><div class="refsect1" id="id-1.9.5.13.9"><h2>See Also</h2><span class="simplelist"><a class="xref" href="wal-internals.html" title="29.5. WAL Internals">Section 29.5</a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="pgupgrade.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="reference-server.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="app-postgres.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="application">pg_upgrade</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="application">postgres</span></td></tr></table></div></body></html>
上海开阖软件有限公司 沪ICP备12045867号-1