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+<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
+        "http://www.w3.org/TR/html4/loose.dtd">
+
+<html>
+
+<head>
+
+<title>Postfix CDB Howto</title>
+
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+
+</head>
+
+<body>
+
+<h1><img src="postfix-logo.jpg" width="203" height="98" ALT="">Postfix CDB Howto</h1>
+
+<hr>
+
+<h2>Introduction</h2>
+
+<p> CDB (Constant DataBase) is an indexed file format designed by
+Daniel Bernstein. CDB is optimized exclusively for read access
+and guarantees that each record will be read in at most two disk
+accesses. This is achieved by forgoing support for incremental
+updates: no single-record inserts or deletes are supported.  CDB
+databases can be modified only by rebuilding them completely from
+scratch, hence the "constant" qualifier in the name.  </p>
+
+<p> Postfix CDB databases are specified as "cdb:<i>name</i>", where
+<i>name</i> specifies the CDB file name without the ".cdb" suffix
+(another suffix, ".tmp", is used temporarily while a CDB file is
+under construction).  CDB databases are maintained with the postmap(1)
+or postalias(1) command. The DATABASE_README document has general
+information about Postfix databases.  </p>
+
+<p> CDB support is available with Postfix 2.2 and later releases.
+This document describes how to build Postfix with CDB support. </p>
+
+<h2>Building Postfix with CDB support</h2>
+
+<p> These instructions assume that you build Postfix from source
+code as described in the INSTALL document. Some modification may
+be required if you build Postfix from a vendor-specific source
+package.  </p>
+
+<p> Postfix is compatible with two CDB implementations: </p>
+
+<ul>
+
+<li> <p> The original cdb library from Daniel Bernstein, available
+from http://cr.yp.to/cdb.html, and </p>
+
+<li> <p> tinycdb (version 0.5 and later) from Michael Tokarev,
+available from http://www.corpit.ru/mjt/tinycdb.html. </p>
+
+</ul>
+
+<p>  Tinycdb is preferred, since it is a bit faster, has additional
+useful functionality and is much simpler to use. </p>
+
+<p>To build Postfix after you have installed tinycdb, use something
+like: </p>
+
+<blockquote>
+<pre>
+% make tidy
+% CDB=../../../tinycdb-0.5
+% make -f Makefile.init makefiles "CCARGS=-DHAS_CDB -I$CDB" \
+    "AUXLIBS_CDB=$CDB/libcdb.a"
+% make
+</pre>
+</blockquote>
+
+<p> Alternatively, for the D.J.B. version of CDB:<p>
+
+<blockquote>
+<pre>
+% make tidy
+% CDB=../../../cdb-0.75
+% make -f Makefile.init makefiles "CCARGS=-DHAS_CDB -I$CDB" \
+    "AUXLIBS_CDB=$CDB/cdb.a $CDB/alloc.a $CDB/buffer.a $CDB/unix.a $CDB/byte.a"
+% make
+</pre>
+</blockquote>
+
+<p> Postfix versions before 3.0 use AUXLIBS instead of AUXLIBS_CDB.
+With Postfix 3.0 and later, the old AUXLIBS variable still supports
+building a statically-loaded CDB database client, but only the new
+AUXLIBS_CDB variable supports building a dynamically-loaded or
+statically-loaded CDB database client.  </p>
+
+<blockquote>
+
+<p> Failure to use the AUXLIBS_CDB variable will defeat the purpose
+of dynamic database client loading. Every Postfix executable file
+will have CDB database library dependencies. And that was exactly
+what dynamic database client loading was meant to avoid. </p>
+
+</blockquote>
+
+<p> After Postfix has been built with cdb support, you can use
+"cdb" tables wherever you can use read-only "hash", "btree" or
+"dbm" tables. However, the "<b>postmap -i</b>" (incremental record
+insertion) and "<b>postmap -d</b>" (incremental record deletion)
+command-line options are not available. For the same reason the
+"cdb" map type cannot be used to store the persistent address
+verification cache for the verify(8) service, or to store
+TLS session information for the tlsmgr(8) service. </p>