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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/lo-intro.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/lo-intro.html')
| -rw-r--r-- | doc/src/sgml/html/lo-intro.html | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/src/sgml/html/lo-intro.html b/doc/src/sgml/html/lo-intro.html new file mode 100644 index 0000000..91f93f5 --- /dev/null +++ b/doc/src/sgml/html/lo-intro.html @@ -0,0 +1,18 @@ +<?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>34.1. Introduction</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="largeobjects.html" title="Chapter 34. Large Objects" /><link rel="next" href="lo-implementation.html" title="34.2. Implementation Features" /></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">34.1. Introduction</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="largeobjects.html" title="Chapter 34. Large Objects">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="largeobjects.html" title="Chapter 34. Large Objects">Up</a></td><th width="60%" align="center">Chapter 34. Large Objects</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="lo-implementation.html" title="34.2. Implementation Features">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="LO-INTRO"><div class="titlepage"><div><div><h2 class="title" style="clear: both">34.1. Introduction</h2></div></div></div><a id="id-1.7.4.6.2" class="indexterm"></a><p> + All large objects are stored in a single system table named <a class="link" href="catalog-pg-largeobject.html" title="51.30. pg_largeobject"><code class="structname">pg_largeobject</code></a>. + Each large object also has an entry in the system table <a class="link" href="catalog-pg-largeobject-metadata.html" title="51.31. pg_largeobject_metadata"><code class="structname">pg_largeobject_metadata</code></a>. + Large objects can be created, modified, and deleted using a read/write API + that is similar to standard operations on files. + </p><p> + <span class="productname">PostgreSQL</span> also supports a storage system called + <a class="link" href="storage-toast.html" title="69.2. TOAST"><span class="quote">“<span class="quote"><acronym class="acronym">TOAST</acronym></span>”</span></a>, + which automatically stores values + larger than a single database page into a secondary storage area per table. + This makes the large object facility partially obsolete. One + remaining advantage of the large object facility is that it allows values + up to 4 TB in size, whereas <acronym class="acronym">TOAST</acronym>ed fields can be at + most 1 GB. Also, reading and updating portions of a large object can be + done efficiently, while most operations on a <acronym class="acronym">TOAST</acronym>ed + field will read or write the whole value as a unit. + </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="largeobjects.html" title="Chapter 34. Large Objects">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="largeobjects.html" title="Chapter 34. Large Objects">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="lo-implementation.html" title="34.2. Implementation Features">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 34. Large Objects </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"> 34.2. Implementation Features</td></tr></table></div></body></html>
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