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diff --git a/doc/src/sgml/html/tutorial-arch.html b/doc/src/sgml/html/tutorial-arch.html new file mode 100644 index 0000000..f123008 --- /dev/null +++ b/doc/src/sgml/html/tutorial-arch.html @@ -0,0 +1,49 @@ +<?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>1.2. Architectural Fundamentals</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="tutorial-install.html" title="1.1. Installation" /><link rel="next" href="tutorial-createdb.html" title="1.3. Creating a Database" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">1.2. Architectural Fundamentals</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="tutorial-install.html" title="1.1. Installation">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="tutorial-start.html" title="Chapter 1. Getting Started">Up</a></td><th width="60%" align="center">Chapter 1. Getting Started</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="tutorial-createdb.html" title="1.3. Creating a Database">Next</a></td></tr></table><hr /></div><div class="sect1" id="TUTORIAL-ARCH"><div class="titlepage"><div><div><h2 class="title" style="clear: both">1.2. Architectural Fundamentals</h2></div></div></div><p> + Before we proceed, you should understand the basic + <span class="productname">PostgreSQL</span> system architecture. + Understanding how the parts of + <span class="productname">PostgreSQL</span> interact will make this + chapter somewhat clearer. + </p><p> + In database jargon, <span class="productname">PostgreSQL</span> uses a + client/server model. A <span class="productname">PostgreSQL</span> + session consists of the following cooperating processes + (programs): + + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + A server process, which manages the database files, accepts + connections to the database from client applications, and + performs database actions on behalf of the clients. The + database server program is called + <code class="filename">postgres</code>. + <a id="id-1.4.3.3.3.3.1.1.2" class="indexterm"></a> + </p></li><li class="listitem"><p> + The user's client (frontend) application that wants to perform + database operations. Client applications can be very diverse + in nature: a client could be a text-oriented tool, a graphical + application, a web server that accesses the database to + display web pages, or a specialized database maintenance tool. + Some client applications are supplied with the + <span class="productname">PostgreSQL</span> distribution; most are + developed by users. + </p></li></ul></div><p> + </p><p> + As is typical of client/server applications, the client and the + server can be on different hosts. In that case they communicate + over a TCP/IP network connection. You should keep this in mind, + because the files that can be accessed on a client machine might + not be accessible (or might only be accessible using a different + file name) on the database server machine. + </p><p> + The <span class="productname">PostgreSQL</span> server can handle + multiple concurrent connections from clients. To achieve this it + starts (<span class="quote">“<span class="quote">forks</span>”</span>) a new process for each connection. + From that point on, the client and the new server process + communicate without intervention by the original + <code class="filename">postgres</code> process. Thus, the + supervisor server process is always running, waiting for + client connections, whereas client and associated server processes + come and go. (All of this is of course invisible to the user. We + only mention it here for completeness.) + </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="tutorial-install.html" title="1.1. Installation">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="tutorial-start.html" title="Chapter 1. Getting Started">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="tutorial-createdb.html" title="1.3. Creating a Database">Next</a></td></tr><tr><td width="40%" align="left" valign="top">1.1. Installation </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 1.3. Creating a Database</td></tr></table></div></body></html>
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