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diff --git a/doc/src/sgml/html/monitoring-ps.html b/doc/src/sgml/html/monitoring-ps.html new file mode 100644 index 0000000..a611166 --- /dev/null +++ b/doc/src/sgml/html/monitoring-ps.html @@ -0,0 +1,77 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!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>28.1. Standard Unix Tools</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="monitoring.html" title="Chapter 28. Monitoring Database Activity" /><link rel="next" href="monitoring-stats.html" title="28.2. The Cumulative Statistics System" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">28.1. Standard Unix Tools</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="monitoring.html" title="Chapter 28. Monitoring Database Activity">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="monitoring.html" title="Chapter 28. Monitoring Database Activity">Up</a></td><th width="60%" align="center">Chapter 28. Monitoring Database Activity</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="monitoring-stats.html" title="28.2. The Cumulative Statistics System">Next</a></td></tr></table><hr /></div><div class="sect1" id="MONITORING-PS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">28.1. Standard Unix Tools</h2></div></div></div><a id="id-1.6.15.6.2" class="indexterm"></a><p> + On most Unix platforms, <span class="productname">PostgreSQL</span> modifies its + command title as reported by <code class="command">ps</code>, so that individual server + processes can readily be identified. A sample display is + +</p><pre class="screen"> +$ ps auxww | grep ^postgres +postgres 15551 0.0 0.1 57536 7132 pts/0 S 18:02 0:00 postgres -i +postgres 15554 0.0 0.0 57536 1184 ? Ss 18:02 0:00 postgres: background writer +postgres 15555 0.0 0.0 57536 916 ? Ss 18:02 0:00 postgres: checkpointer +postgres 15556 0.0 0.0 57536 916 ? Ss 18:02 0:00 postgres: walwriter +postgres 15557 0.0 0.0 58504 2244 ? Ss 18:02 0:00 postgres: autovacuum launcher +postgres 15582 0.0 0.0 58772 3080 ? Ss 18:04 0:00 postgres: joe runbug 127.0.0.1 idle +postgres 15606 0.0 0.0 58772 3052 ? Ss 18:07 0:00 postgres: tgl regression [local] SELECT waiting +postgres 15610 0.0 0.0 58772 3056 ? Ss 18:07 0:00 postgres: tgl regression [local] idle in transaction +</pre><p> + + (The appropriate invocation of <code class="command">ps</code> varies across different + platforms, as do the details of what is shown. This example is from a + recent Linux system.) The first process listed here is the + primary server process. The command arguments + shown for it are the same ones used when it was launched. The next four + processes are background worker processes automatically launched by the + primary process. (The <span class="quote">“<span class="quote">autovacuum launcher</span>”</span> process will not + be present if you have set the system not to run autovacuum.) + Each of the remaining + processes is a server process handling one client connection. Each such + process sets its command line display in the form + +</p><pre class="screen"> +postgres: <em class="replaceable"><code>user</code></em> <em class="replaceable"><code>database</code></em> <em class="replaceable"><code>host</code></em> <em class="replaceable"><code>activity</code></em> +</pre><p> + + The user, database, and (client) host items remain the same for + the life of the client connection, but the activity indicator changes. + The activity can be <code class="literal">idle</code> (i.e., waiting for a client command), + <code class="literal">idle in transaction</code> (waiting for client inside a <code class="command">BEGIN</code> block), + or a command type name such as <code class="literal">SELECT</code>. Also, + <code class="literal">waiting</code> is appended if the server process is presently waiting + on a lock held by another session. In the above example we can infer + that process 15606 is waiting for process 15610 to complete its transaction + and thereby release some lock. (Process 15610 must be the blocker, because + there is no other active session. In more complicated cases it would be + necessary to look into the + <a class="link" href="view-pg-locks.html" title="54.12. pg_locks"><code class="structname">pg_locks</code></a> + system view to determine who is blocking whom.) + </p><p> + If <a class="xref" href="runtime-config-logging.html#GUC-CLUSTER-NAME">cluster_name</a> has been configured the + cluster name will also be shown in <code class="command">ps</code> output: +</p><pre class="screen"> +$ psql -c 'SHOW cluster_name' + cluster_name +-------------- + server1 +(1 row) + +$ ps aux|grep server1 +postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: server1: background writer +... +</pre><p> + </p><p> + If you have turned off <a class="xref" href="runtime-config-logging.html#GUC-UPDATE-PROCESS-TITLE">update_process_title</a> then the + activity indicator is not updated; the process title is set only once + when a new process is launched. On some platforms this saves a measurable + amount of per-command overhead; on others it's insignificant. + </p><div class="tip"><h3 class="title">Tip</h3><p> + <span class="productname">Solaris</span> requires special handling. You must + use <code class="command">/usr/ucb/ps</code>, rather than + <code class="command">/bin/ps</code>. You also must use two <code class="option">w</code> + flags, not just one. In addition, your original invocation of the + <code class="command">postgres</code> command must have a shorter + <code class="command">ps</code> status display than that provided by each + server process. If you fail to do all three things, the <code class="command">ps</code> + output for each server process will be the original <code class="command">postgres</code> + command line. + </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="monitoring.html" title="Chapter 28. Monitoring Database Activity">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="monitoring.html" title="Chapter 28. Monitoring Database Activity">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="monitoring-stats.html" title="28.2. The Cumulative Statistics System">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 28. Monitoring Database Activity </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 28.2. 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