forked from lthn/blockchain
28659827c3
lmdb v 24 requires manual resizing/growing during it's normal function Zano core is purely async so it's not easy to prevent all DB txs from starting on lmdb adapter level, because it will lead to random deadlocks in the core due to many high-level cross-thread dependencies. We will rethink this later. Many thanks to @leo-yuriev who helped us to discover these issues!
81 lines
2.3 KiB
Groff
81 lines
2.3 KiB
Groff
.TH MDB_DUMP 1 "2014/06/20" "LMDB 0.9.14"
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.\" Copyright 2014-2015 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 \-v ]
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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 \-v
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Use the previous environment state instead of the latest state.
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This may be useful if the latest state has been corrupted.
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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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