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diff --git a/doc/src/sgml/html/protocol.html b/doc/src/sgml/html/protocol.html new file mode 100644 index 0000000..6a357cc --- /dev/null +++ b/doc/src/sgml/html/protocol.html @@ -0,0 +1,35 @@ +<?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>Chapter 53. Frontend/Backend Protocol</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-views.html" title="52.97. pg_views" /><link rel="next" href="protocol-overview.html" title="53.1. Overview" /></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">Chapter 53. Frontend/Backend Protocol</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="view-pg-views.html" title="52.97. pg_views">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="internals.html" title="Part VII. Internals">Up</a></td><th width="60%" align="center">Part VII. Internals</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 14.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="protocol-overview.html" title="53.1. Overview">Next</a></td></tr></table><hr></hr></div><div class="chapter" id="PROTOCOL"><div class="titlepage"><div><div><h2 class="title">Chapter 53. Frontend/Backend Protocol</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="protocol-overview.html">53.1. Overview</a></span></dt><dd><dl><dt><span class="sect2"><a href="protocol-overview.html#PROTOCOL-MESSAGE-CONCEPTS">53.1.1. Messaging Overview</a></span></dt><dt><span class="sect2"><a href="protocol-overview.html#PROTOCOL-QUERY-CONCEPTS">53.1.2. Extended Query Overview</a></span></dt><dt><span class="sect2"><a href="protocol-overview.html#PROTOCOL-FORMAT-CODES">53.1.3. Formats and Format Codes</a></span></dt></dl></dd><dt><span class="sect1"><a href="protocol-flow.html">53.2. Message Flow</a></span></dt><dd><dl><dt><span class="sect2"><a href="protocol-flow.html#id-1.10.5.7.3">53.2.1. Start-up</a></span></dt><dt><span class="sect2"><a href="protocol-flow.html#id-1.10.5.7.4">53.2.2. Simple Query</a></span></dt><dt><span class="sect2"><a href="protocol-flow.html#PROTOCOL-FLOW-EXT-QUERY">53.2.3. Extended Query</a></span></dt><dt><span class="sect2"><a href="protocol-flow.html#PROTOCOL-FLOW-PIPELINING">53.2.4. Pipelining</a></span></dt><dt><span class="sect2"><a href="protocol-flow.html#id-1.10.5.7.7">53.2.5. Function Call</a></span></dt><dt><span class="sect2"><a href="protocol-flow.html#PROTOCOL-COPY">53.2.6. COPY Operations</a></span></dt><dt><span class="sect2"><a href="protocol-flow.html#PROTOCOL-ASYNC">53.2.7. Asynchronous Operations</a></span></dt><dt><span class="sect2"><a href="protocol-flow.html#id-1.10.5.7.10">53.2.8. Canceling Requests in Progress</a></span></dt><dt><span class="sect2"><a href="protocol-flow.html#id-1.10.5.7.11">53.2.9. Termination</a></span></dt><dt><span class="sect2"><a href="protocol-flow.html#id-1.10.5.7.12">53.2.10. <acronym class="acronym">SSL</acronym> Session Encryption</a></span></dt><dt><span class="sect2"><a href="protocol-flow.html#id-1.10.5.7.13">53.2.11. <acronym class="acronym">GSSAPI</acronym> Session Encryption</a></span></dt></dl></dd><dt><span class="sect1"><a href="sasl-authentication.html">53.3. SASL Authentication</a></span></dt><dd><dl><dt><span class="sect2"><a href="sasl-authentication.html#SASL-SCRAM-SHA-256">53.3.1. SCRAM-SHA-256 Authentication</a></span></dt></dl></dd><dt><span class="sect1"><a href="protocol-replication.html">53.4. Streaming Replication Protocol</a></span></dt><dt><span class="sect1"><a href="protocol-logical-replication.html">53.5. Logical Streaming Replication Protocol</a></span></dt><dd><dl><dt><span class="sect2"><a href="protocol-logical-replication.html#PROTOCOL-LOGICAL-REPLICATION-PARAMS">53.5.1. Logical Streaming Replication Parameters</a></span></dt><dt><span class="sect2"><a href="protocol-logical-replication.html#PROTOCOL-LOGICAL-MESSAGES">53.5.2. Logical Replication Protocol Messages</a></span></dt><dt><span class="sect2"><a href="protocol-logical-replication.html#PROTOCOL-LOGICAL-MESSAGES-FLOW">53.5.3. Logical Replication Protocol Message Flow</a></span></dt></dl></dd><dt><span class="sect1"><a href="protocol-message-types.html">53.6. Message Data Types</a></span></dt><dt><span class="sect1"><a href="protocol-message-formats.html">53.7. Message Formats</a></span></dt><dt><span class="sect1"><a href="protocol-error-fields.html">53.8. Error and Notice Message Fields</a></span></dt><dt><span class="sect1"><a href="protocol-logicalrep-message-formats.html">53.9. Logical Replication Message Formats</a></span></dt><dt><span class="sect1"><a href="protocol-changes.html">53.10. Summary of Changes since Protocol 2.0</a></span></dt></dl></div><a id="id-1.10.5.2" class="indexterm"></a><p> + <span class="productname">PostgreSQL</span> uses a message-based protocol + for communication between frontends and backends (clients and servers). + The protocol is supported over <acronym class="acronym">TCP/IP</acronym> and also over + Unix-domain sockets. Port number 5432 has been registered with IANA as + the customary TCP port number for servers supporting this protocol, but + in practice any non-privileged port number can be used. + </p><p> + This document describes version 3.0 of the protocol, implemented in + <span class="productname">PostgreSQL</span> 7.4 and later. For descriptions + of the earlier protocol versions, see previous releases of the + <span class="productname">PostgreSQL</span> documentation. A single server + can support multiple protocol versions. The initial startup-request + message tells the server which protocol version the client is attempting to + use. If the major version requested by the client is not supported by + the server, the connection will be rejected (for example, this would occur + if the client requested protocol version 4.0, which does not exist as of + this writing). If the minor version requested by the client is not + supported by the server (e.g., the client requests version 3.1, but the + server supports only 3.0), the server may either reject the connection or + may respond with a NegotiateProtocolVersion message containing the highest + minor protocol version which it supports. The client may then choose either + to continue with the connection using the specified protocol version or + to abort the connection. + </p><p> + In order to serve multiple clients efficiently, the server launches + a new <span class="quote">“<span class="quote">backend</span>”</span> process for each client. + In the current implementation, a new child + process is created immediately after an incoming connection is detected. + This is transparent to the protocol, however. For purposes of the + protocol, the terms <span class="quote">“<span class="quote">backend</span>”</span> and <span class="quote">“<span class="quote">server</span>”</span> are + interchangeable; likewise <span class="quote">“<span class="quote">frontend</span>”</span> and <span class="quote">“<span class="quote">client</span>”</span> + are interchangeable. + </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-views.html" title="52.97. pg_views">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="internals.html" title="Part VII. Internals">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="protocol-overview.html" title="53.1. Overview">Next</a></td></tr><tr><td width="40%" align="left" valign="top">52.97. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_views</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 14.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 53.1. Overview</td></tr></table></div></body></html>
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