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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>Chapter 27. Monitoring Database Activity</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="hot-standby.html" title="26.5. Hot Standby" /><link rel="next" href="monitoring-ps.html" title="27.1. Standard Unix Tools" /></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">Chapter 27. Monitoring Database Activity</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="hot-standby.html" title="26.5. Hot Standby">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="admin.html" title="Part III. Server Administration">Up</a></td><th width="60%" align="center">Part III. Server Administration</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="monitoring-ps.html" title="27.1. Standard Unix Tools">Next</a></td></tr></table><hr></hr></div><div class="chapter" id="MONITORING"><div class="titlepage"><div><div><h2 class="title">Chapter 27. Monitoring Database Activity</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="monitoring-ps.html">27.1. Standard Unix Tools</a></span></dt><dt><span class="sect1"><a href="monitoring-stats.html">27.2. The Statistics Collector</a></span></dt><dd><dl><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-STATS-SETUP">27.2.1. Statistics Collection Configuration</a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-STATS-VIEWS">27.2.2. Viewing Statistics</a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-ACTIVITY-VIEW">27.2.3. <code class="structname">pg_stat_activity</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-REPLICATION-VIEW">27.2.4. <code class="structname">pg_stat_replication</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-WAL-RECEIVER-VIEW">27.2.5. <code class="structname">pg_stat_wal_receiver</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-SUBSCRIPTION">27.2.6. <code class="structname">pg_stat_subscription</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-SSL-VIEW">27.2.7. <code class="structname">pg_stat_ssl</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-GSSAPI-VIEW">27.2.8. <code class="structname">pg_stat_gssapi</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-ARCHIVER-VIEW">27.2.9. <code class="structname">pg_stat_archiver</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-BGWRITER-VIEW">27.2.10. <code class="structname">pg_stat_bgwriter</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-DATABASE-VIEW">27.2.11. <code class="structname">pg_stat_database</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-DATABASE-CONFLICTS-VIEW">27.2.12. <code class="structname">pg_stat_database_conflicts</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-ALL-TABLES-VIEW">27.2.13. <code class="structname">pg_stat_all_tables</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-ALL-INDEXES-VIEW">27.2.14. <code class="structname">pg_stat_all_indexes</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STATIO-ALL-TABLES-VIEW">27.2.15. <code class="structname">pg_statio_all_tables</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STATIO-ALL-INDEXES-VIEW">27.2.16. <code class="structname">pg_statio_all_indexes</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STATIO-ALL-SEQUENCES-VIEW">27.2.17. <code class="structname">pg_statio_all_sequences</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-USER-FUNCTIONS-VIEW">27.2.18. <code class="structname">pg_stat_user_functions</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-PG-STAT-SLRU-VIEW">27.2.19. <code class="structname">pg_stat_slru</code></a></span></dt><dt><span class="sect2"><a href="monitoring-stats.html#MONITORING-STATS-FUNCTIONS">27.2.20. Statistics Functions</a></span></dt></dl></dd><dt><span class="sect1"><a href="monitoring-locks.html">27.3. Viewing Locks</a></span></dt><dt><span class="sect1"><a href="progress-reporting.html">27.4. Progress Reporting</a></span></dt><dd><dl><dt><span class="sect2"><a href="progress-reporting.html#ANALYZE-PROGRESS-REPORTING">27.4.1. ANALYZE Progress Reporting</a></span></dt><dt><span class="sect2"><a href="progress-reporting.html#CREATE-INDEX-PROGRESS-REPORTING">27.4.2. CREATE INDEX Progress Reporting</a></span></dt><dt><span class="sect2"><a href="progress-reporting.html#VACUUM-PROGRESS-REPORTING">27.4.3. VACUUM Progress Reporting</a></span></dt><dt><span class="sect2"><a href="progress-reporting.html#CLUSTER-PROGRESS-REPORTING">27.4.4. CLUSTER Progress Reporting</a></span></dt><dt><span class="sect2"><a href="progress-reporting.html#BASEBACKUP-PROGRESS-REPORTING">27.4.5. Base Backup Progress Reporting</a></span></dt></dl></dd><dt><span class="sect1"><a href="dynamic-trace.html">27.5. Dynamic Tracing</a></span></dt><dd><dl><dt><span class="sect2"><a href="dynamic-trace.html#COMPILING-FOR-TRACE">27.5.1. Compiling for Dynamic Tracing</a></span></dt><dt><span class="sect2"><a href="dynamic-trace.html#TRACE-POINTS">27.5.2. Built-in Probes</a></span></dt><dt><span class="sect2"><a href="dynamic-trace.html#USING-TRACE-POINTS">27.5.3. Using Probes</a></span></dt><dt><span class="sect2"><a href="dynamic-trace.html#DEFINING-TRACE-POINTS">27.5.4. Defining New Probes</a></span></dt></dl></dd></dl></div><a id="id-1.6.14.2" class="indexterm"></a><a id="id-1.6.14.3" class="indexterm"></a><p>
+  A database administrator frequently wonders, <span class="quote">“<span class="quote">What is the system
+  doing right now?</span>”</span>
+  This chapter discusses how to find that out.
+ </p><p>
+   Several tools are available for monitoring database activity and
+   analyzing performance.  Most of this chapter is devoted to describing
+   <span class="productname">PostgreSQL</span>'s statistics collector,
+   but one should not neglect regular Unix monitoring programs such as
+   <code class="command">ps</code>, <code class="command">top</code>, <code class="command">iostat</code>, and <code class="command">vmstat</code>.
+   Also, once one has identified a
+   poorly-performing query, further investigation might be needed using
+   <span class="productname">PostgreSQL</span>'s <a class="xref" href="sql-explain.html" title="EXPLAIN"><span class="refentrytitle">EXPLAIN</span></a> command.
+   <a class="xref" href="using-explain.html" title="14.1. Using EXPLAIN">Section 14.1</a> discusses <code class="command">EXPLAIN</code>
+   and other methods for understanding the behavior of an individual
+   query.
+  </p></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="hot-standby.html" title="26.5. Hot Standby">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="admin.html" title="Part III. Server Administration">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="monitoring-ps.html" title="27.1. Standard Unix Tools">Next</a></td></tr><tr><td width="40%" align="left" valign="top">26.5. Hot Standby </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 27.1. Standard Unix Tools</td></tr></table></div></body></html>
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