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+#++
+# NAME
+# lmdb_table 5
+# SUMMARY
+# Postfix LMDB adapter
+# SYNOPSIS
+# \fBpostmap lmdb:/etc/postfix/\fIfilename\fR
+# .br
+# \fBpostmap -i lmdb:/etc/postfix/\fIfilename\fB <\fIinputfile\fR
+#
+# \fBpostmap -d "\fIkey\fB" lmdb:/etc/postfix/\fIfilename\fR
+# .br
+# \fBpostmap -d - lmdb:/etc/postfix/\fIfilename\fB <\fIinputfile\fR
+#
+# \fBpostmap -q "\fIkey\fB" lmdb:/etc/postfix/\fIfilename\fR
+# .br
+# \fBpostmap -q - lmdb:/etc/postfix/\fIfilename\fB <\fIinputfile\fR
+# DESCRIPTION
+# The Postfix LMDB adapter provides access to a persistent,
+# memory-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
+# .ad
+# .fi
+# 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 localpart, address extension
+# or domain portion. This behavior is also found with, for
+# example, btree:, hash:, or ldap: tables.
+#
+# Unlike other flat-file Postfix databases, changes to
+# an LMDB database do not trigger automatic daemon program
+# restart, and do not require "\fBpostfix reload\fR".
+# RELIABILITY
+# .ad
+# .fi
+# 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
+# serializing requests through the proxymap(8) service. This
+# makes LMDB suitable as a shared cache for verify(8) or
+# postscreen(8) services.
+# SYNCHRONIZATION
+# .ad
+# .fi
+# 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 protocol 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 simultaneous database requests, then it must
+# protect its transactions with in-process locks, in addition
+# to the per-process fcntl(2) locks.
+# CONFIGURATION PARAMETERS
+# .ad
+# .fi
+# Short-lived programs automatically pick up changes to
+# main.cf. With long-running daemon programs, Use the command
+# "\fBpostfix reload\fR" after a configuration change.
+# .IP "\fBlmdb_map_size (default: 16777216)\fR"
+# The initial LMDB database size limit in bytes.
+# SEE ALSO
+# postconf(1), Postfix supported lookup tables
+# postmap(1), Postfix lookup table maintenance
+# postconf(5), configuration parameters
+# README FILES
+# .ad
+# .fi
+# Use "\fBpostconf readme_directory\fR" or
+# "\fBpostconf html_directory\fR" to locate this information.
+# .na
+# .nf
+# DATABASE_README, Postfix lookup table overview
+# LMDB_README, Postfix OpenLDAP LMDB howto
+# LICENSE
+# .ad
+# .fi
+# 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
+#--