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.TH MDB_DUMP 1 "2015/09/30" "LMDB 0.9.17"
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.\" Copyright 2014-2021 Howard Chu, Symas Corp. All Rights Reserved.
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.\" Copying restrictions apply. See COPYRIGHT/LICENSE.
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.SH NAME
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mdb_dump \- LMDB environment export tool
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.SH SYNOPSIS
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.B mdb_dump
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[\c
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.BR \-V ]
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[\c
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.BI \-f \ file\fR]
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[\c
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.BR \-l ]
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[\c
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.BR \-n ]
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[\c
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.BR \-p ]
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[\c
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.BR \-a \ |
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.BI \-s \ subdb\fR]
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.BR \ envpath
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.SH DESCRIPTION
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The
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.B mdb_dump
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utility reads a database and writes its contents to the
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standard output using a portable flat-text format
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understood by the
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.BR mdb_load (1)
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utility.
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.SH OPTIONS
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.TP
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.BR \-V
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Write the library version number to the standard output, and exit.
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.TP
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.BR \-f \ file
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Write to the specified file instead of to the standard output.
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.TP
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.BR \-l
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List the databases stored in the environment. Just the
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names will be listed, no data will be output.
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.TP
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.BR \-n
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Dump an LMDB database which does not use subdirectories.
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.TP
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.BR \-p
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If characters in either the key or data items are printing characters (as
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defined by isprint(3)), output them directly. This option permits users to
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use standard text editors and tools to modify the contents of databases.
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Note: different systems may have different notions about what characters
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are considered printing characters, and databases dumped in this manner may
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be less portable to external systems.
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.TP
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.BR \-a
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Dump all of the subdatabases in the environment.
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.TP
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.BR \-s \ subdb
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Dump a specific subdatabase. If no database is specified, only the main database is dumped.
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.SH DIAGNOSTICS
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Exit status is zero if no errors occur.
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Errors result in a non-zero exit status and
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a diagnostic message being written to standard error.
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Dumping and reloading databases that use user-defined comparison functions
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will result in new databases that use the default comparison functions.
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\fBIn this case it is quite likely that the reloaded database will be
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damaged beyond repair permitting neither record storage nor retrieval.\fP
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The only available workaround is to modify the source for the
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.BR mdb_load (1)
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utility to load the database using the correct comparison functions.
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.SH "SEE ALSO"
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.BR mdb_load (1)
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.SH AUTHOR
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Howard Chu of Symas Corporation <http://www.symas.com>
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