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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
| commit | 6eb9c5a5657d1fe77b55cc261450f3538d35a94d (patch) | |
| tree | 657d8194422a5daccecfd42d654b8a245ef7b4c8 /doc/src/sgml/html/view-pg-shmem-allocations.html | |
| parent | Initial commit. (diff) | |
| download | postgresql-13-upstream.tar.xz postgresql-13-upstream.zip | |
Adding upstream version 13.4.upstream/13.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/src/sgml/html/view-pg-shmem-allocations.html')
| -rw-r--r-- | doc/src/sgml/html/view-pg-shmem-allocations.html | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/doc/src/sgml/html/view-pg-shmem-allocations.html b/doc/src/sgml/html/view-pg-shmem-allocations.html new file mode 100644 index 0000000..9f068e5 --- /dev/null +++ b/doc/src/sgml/html/view-pg-shmem-allocations.html @@ -0,0 +1,51 @@ +<?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>51.87. pg_shmem_allocations</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="view-pg-shadow.html" title="51.86. pg_shadow" /><link rel="next" href="view-pg-stats.html" title="51.88. pg_stats" /></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">51.87. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_shmem_allocations</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="view-pg-shadow.html" title="51.86. pg_shadow">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 51. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 51. System Catalogs</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="view-pg-stats.html" title="51.88. pg_stats">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="VIEW-PG-SHMEM-ALLOCATIONS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">51.87. <code class="structname">pg_shmem_allocations</code></h2></div></div></div><a id="id-1.10.4.89.2" class="indexterm"></a><p> + The <code class="structname">pg_shmem_allocations</code> view shows allocations + made from the server's main shared memory segment. This includes both + memory allocated by <span class="productname">postgres</span> itself and memory + allocated by extensions using the mechanisms detailed in + <a class="xref" href="xfunc-c.html#XFUNC-SHARED-ADDIN" title="37.10.10. Shared Memory and LWLocks">Section 37.10.10</a>. + </p><p> + Note that this view does not include memory allocated using the dynamic + shared memory infrastructure. + </p><div class="table" id="id-1.10.4.89.5"><p class="title"><strong>Table 51.88. <code class="structname">pg_shmem_allocations</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_shmem_allocations 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> + The name of the shared memory allocation. NULL for unused memory + and <code class="literal"><anonymous></code> for anonymous + allocations. + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">off</code> <code class="type">int8</code> + </p> + <p> + The offset at which the allocation starts. NULL for anonymous + allocations, since details related to them are not known. + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">size</code> <code class="type">int8</code> + </p> + <p> + Size of the allocation + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">allocated_size</code> <code class="type">int8</code> + </p> + <p> + Size of the allocation including padding. For anonymous + allocations, no information about padding is available, so the + <code class="literal">size</code> and <code class="literal">allocated_size</code> columns + will always be equal. Padding is not meaningful for free memory, so + the columns will be equal in that case also. + </p></td></tr></tbody></table></div></div><br class="table-break" /><p> + Anonymous allocations are allocations that have been made + with <code class="literal">ShmemAlloc()</code> directly, rather than via + <code class="literal">ShmemInitStruct()</code> or + <code class="literal">ShmemInitHash()</code>. + </p><p> + By default, the <code class="structname">pg_shmem_allocations</code> view can be + read only by superusers. + </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="view-pg-shadow.html" title="51.86. pg_shadow">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html" title="Chapter 51. System Catalogs">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="view-pg-stats.html" title="51.88. pg_stats">Next</a></td></tr><tr><td width="40%" align="left" valign="top">51.86. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_shadow</code> </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"> 51.88. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_stats</code></td></tr></table></div></body></html>
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