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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>54.4. pg_backend_memory_contexts</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="view-pg-available-extension-versions.html" title="54.3. pg_available_extension_versions" /><link rel="next" href="view-pg-config.html" title="54.5. pg_config" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">54.4. <code class="structname">pg_backend_memory_contexts</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="view-pg-available-extension-versions.html" title="54.3. pg_available_extension_versions">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="views.html" title="Chapter 54. System Views">Up</a></td><th width="60%" align="center">Chapter 54. System Views</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="view-pg-config.html" title="54.5. pg_config">Next</a></td></tr></table><hr /></div><div class="sect1" id="VIEW-PG-BACKEND-MEMORY-CONTEXTS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">54.4. <code class="structname">pg_backend_memory_contexts</code></h2></div></div></div><a id="id-1.10.5.8.2" class="indexterm"></a><p>
The view <code class="structname">pg_backend_memory_contexts</code> displays all
the memory contexts of the server process attached to the current session.
</p><p>
<code class="structname">pg_backend_memory_contexts</code> contains one row
for each memory context.
</p><div class="table" id="id-1.10.5.8.5"><p class="title"><strong>Table 54.4. <code class="structname">pg_backend_memory_contexts</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_backend_memory_contexts Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
Column Type
</p>
<p>
Description
</p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">name</code> <code class="type">text</code>
</p>
<p>
Name of the memory context
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">ident</code> <code class="type">text</code>
</p>
<p>
Identification information of the memory context. This field is truncated at 1024 bytes
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">parent</code> <code class="type">text</code>
</p>
<p>
Name of the parent of this memory context
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">level</code> <code class="type">int4</code>
</p>
<p>
Distance from TopMemoryContext in context tree
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">total_bytes</code> <code class="type">int8</code>
</p>
<p>
Total bytes allocated for this memory context
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">total_nblocks</code> <code class="type">int8</code>
</p>
<p>
Total number of blocks allocated for this memory context
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">free_bytes</code> <code class="type">int8</code>
</p>
<p>
Free space in bytes
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">free_chunks</code> <code class="type">int8</code>
</p>
<p>
Total number of free chunks
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">used_bytes</code> <code class="type">int8</code>
</p>
<p>
Used space in bytes
</p></td></tr></tbody></table></div></div><br class="table-break" /><p>
By default, the <code class="structname">pg_backend_memory_contexts</code> view can be
read only by superusers or roles with the privileges of the
<code class="literal">pg_read_all_stats</code> role.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="view-pg-available-extension-versions.html" title="54.3. pg_available_extension_versions">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="views.html" title="Chapter 54. System Views">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="view-pg-config.html" title="54.5. pg_config">Next</a></td></tr><tr><td width="40%" align="left" valign="top">54.3. <code class="structname">pg_available_extension_versions</code> </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"> 54.5. <code class="structname">pg_config</code></td></tr></table></div></body></html>
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