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