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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 13:44:03 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 13:44:03 +0000 |
| commit | 293913568e6a7a86fd1479e1cff8e2ecb58d6568 (patch) | |
| tree | fc3b469a3ec5ab71b36ea97cc7aaddb838423a0c /doc/src/sgml/html/catalog-pg-am.html | |
| parent | Initial commit. (diff) | |
| download | postgresql-16-293913568e6a7a86fd1479e1cff8e2ecb58d6568.tar.xz postgresql-16-293913568e6a7a86fd1479e1cff8e2ecb58d6568.zip | |
Adding upstream version 16.2.upstream/16.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/src/sgml/html/catalog-pg-am.html')
| -rw-r--r-- | doc/src/sgml/html/catalog-pg-am.html | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/doc/src/sgml/html/catalog-pg-am.html b/doc/src/sgml/html/catalog-pg-am.html new file mode 100644 index 0000000..101ba46 --- /dev/null +++ b/doc/src/sgml/html/catalog-pg-am.html @@ -0,0 +1,44 @@ +<?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>53.3. pg_am</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="catalog-pg-aggregate.html" title="53.2. pg_aggregate" /><link rel="next" href="catalog-pg-amop.html" title="53.4. pg_amop" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">53.3. <code class="structname">pg_am</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-aggregate.html" title="53.2. pg_aggregate">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 53. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 53. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-amop.html" title="53.4. pg_amop">Next</a></td></tr></table><hr /></div><div class="sect1" id="CATALOG-PG-AM"><div class="titlepage"><div><div><h2 class="title" style="clear: both">53.3. <code class="structname">pg_am</code> <a href="#CATALOG-PG-AM" class="id_link">#</a></h2></div></div></div><a id="id-1.10.4.5.2" class="indexterm"></a><p> + The catalog <code class="structname">pg_am</code> stores information about + relation access methods. There is one row for each access method supported + by the system. + Currently, only tables and indexes have access methods. The requirements for table + and index access methods are discussed in detail in <a class="xref" href="tableam.html" title="Chapter 63. Table Access Method Interface Definition">Chapter 63</a> and + <a class="xref" href="indexam.html" title="Chapter 64. Index Access Method Interface Definition">Chapter 64</a> respectively. + </p><div class="table" id="id-1.10.4.5.4"><p class="title"><strong>Table 53.3. <code class="structname">pg_am</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_am 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">oid</code> <code class="type">oid</code> + </p> + <p> + Row identifier + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">amname</code> <code class="type">name</code> + </p> + <p> + Name of the access method + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">amhandler</code> <code class="type">regproc</code> + (references <a class="link" href="catalog-pg-proc.html" title="53.39. pg_proc"><code class="structname">pg_proc</code></a>.<code class="structfield">oid</code>) + </p> + <p> + OID of a handler function that is responsible for supplying information + about the access method + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">amtype</code> <code class="type">char</code> + </p> + <p> + <code class="literal">t</code> = table (including materialized views), + <code class="literal">i</code> = index. + </p></td></tr></tbody></table></div></div><br class="table-break" /><div class="note"><h3 class="title">Note</h3><p> + Before <span class="productname">PostgreSQL</span> 9.6, <code class="structname">pg_am</code> + contained many additional columns representing properties of index access + methods. That data is now only directly visible at the C code level. + However, <code class="function">pg_index_column_has_property()</code> and related + functions have been added to allow SQL queries to inspect index access + method properties; see <a class="xref" href="functions-info.html#FUNCTIONS-INFO-CATALOG-TABLE" title="Table 9.72. System Catalog Information Functions">Table 9.72</a>. + </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="catalog-pg-aggregate.html" title="53.2. pg_aggregate">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html" title="Chapter 53. System Catalogs">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-amop.html" title="53.4. pg_amop">Next</a></td></tr><tr><td width="40%" align="left" valign="top">53.2. <code class="structname">pg_aggregate</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 53.4. <code class="structname">pg_amop</code></td></tr></table></div></body></html>
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