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75 lines
2.0 KiB
75 lines
2.0 KiB
.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 databases that use user-defined comparison functions will output |
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records with the ordering imposed by those comparison functions. If |
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.B mdb_load |
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is invoked without including the |
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.B -a |
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option when reloading those records, the new databases will likely be |
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damaged beyond repair, permitting neither record storage nor retrieval. |
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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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