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Rename

<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">
<html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<title> Postfix manual - lmdb_table(5) </title>
</head> <body> <pre>
LMDB_TABLE(5) LMDB_TABLE(5)

NAME
 lmdb_table - Postfix LMDB adapter

SYNOPSIS
 postmap <a href="lmdb_table.5.html">lmdb</a>:/etc/postfix/filename
 postmap -i <a href="lmdb_table.5.html">lmdb</a>:/etc/postfix/filename &lt;inputfile

postmap -d "key" <a href="lmdb_table.5.html">lmdb</a>:/etc/postfix/filename
 postmap -d - <a href="lmdb_table.5.html">lmdb</a>:/etc/postfix/filename &lt;inputfile

postmap -q "key" <a href="lmdb_table.5.html">lmdb</a>:/etc/postfix/filename
 postmap -q - <a href="lmdb_table.5.html">lmdb</a>:/etc/postfix/filename &lt;inputfile

DESCRIPTION
 The Postfix LMDB adapter provides access to a persistent, mem-
 ory-mapped, key-value store. The database size is limited only by the
 size of the memory address space (typically 31 or 47 bits on 32-bit or
 64-bit CPUs, respectively) and by the available file system space.

REQUESTS
 The LMDB adapter supports all Postfix lookup table operations. This
 makes LMDB suitable for Postfix address rewriting, routing, access
 policies, caches, or any information that can be stored under a fixed
 lookup key.

When  a  transaction  fails due to a full database, Postfix resizes the
       database and retries the transaction.

Postfix table lookups may generate partial search keys such as domain
 names without one or more subdomains, network addresses without one or
 more least-significant octets, or email addresses without the local-
 part, address extension or domain portion. This behavior is also found
 with, for example, <a href="DATABASE_README.html#types">btree</a>:, <a href="DATABASE_README.html#types">hash</a>:, or <a href="ldap_table.5.html">ldap</a>: tables.

Unlike other flat-file Postfix databases, changes to an LMDB database
 do not trigger automatic daemon program restart, and do not require
 "postfix reload".

RELIABILITY
 LMDB's copy-on-write architecture provides safe updates, at the cost of
 using more space than some other flat-file databases. Read operations
 are memory-mapped for speed. Write operations are not memory-mapped to
 avoid silent corruption due to stray pointer bugs.

Multiple processes can safely update an LMDB database without serializ-
 ing requests through the <a href="proxymap.8.html">proxymap(8)</a> service. This makes LMDB suitable
 as a shared cache for <a href="verify.8.html">verify(8)</a> or <a href="postscreen.8.html">postscreen(8)</a> services.

SYNCHRONIZATION
 The Postfix LMDB adapter does not use LMDB's built-in locking scheme,
 because that would require world-writable lockfiles and would violate
 the Postfix security model. Instead, Postfix uses fcntl(2) locks with
 whole-file granularity. Programs that use LMDB's built-in locking pro-
 tocol will corrupt a Postfix LMDB database or will read garbage.

Every Postfix LMDB database read or write transaction must be protected
       from start to end with a shared or exclusive fcntl(2) lock.   A  writer
       may  atomically  downgrade  an  exclusive lock to a shared lock, but it
       must hold an exclusive lock while opening another write transaction.

Note that fcntl(2) locks do not protect transactions  within  the  same
       process  against each other.  If a program cannot avoid making simulta-
       neous database requests, then it must  protect  its  transactions  with
       in-process locks, in addition to the per-process fcntl(2) locks.

CONFIGURATION PARAMETERS
 Short-lived programs automatically pick up changes to <a href="postconf.5.html">main.cf</a>. With
 long-running daemon programs, Use the command "postfix reload" after a
 configuration change.

<a href="postconf.5.html#lmdb_map_size">lmdb_map_size</a> (default: 16777216)
 The initial LMDB database size limit in bytes.

SEE ALSO
 <a href="postconf.1.html">postconf(1)</a>, Postfix supported lookup tables
 <a href="postmap.1.html">postmap(1)</a>, Postfix lookup table maintenance
 <a href="postconf.5.html">postconf(5)</a>, configuration parameters

README FILES
 <a href="DATABASE_README.html">DATABASE_README</a>, Postfix lookup table overview
 <a href="LMDB_README.html">LMDB_README</a>, Postfix OpenLDAP LMDB howto

LICENSE
 The Secure Mailer license must be distributed with this software.

HISTORY
 LMDB support was introduced with Postfix version 2.11.

AUTHOR(S)
 Howard Chu
 Symas Corporation

Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

Wietse Venema
       Google, Inc.
       111 8th Avenue
       New York, NY 10011, USA

LMDB_TABLE(5)
</pre> </body> </html>