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.TH MDB_COPY 1 "2017/07/31" "LMDB 0.9.90"
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.\" Copyright 2012-2020 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_copy \- LMDB environment copy tool
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.SH SYNOPSIS
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.B mdb_copy
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[\c
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.BR \-V ]
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[\c
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.BR \-c ]
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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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.B srcpath
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[\c
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.BR dstpath ]
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.SH DESCRIPTION
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The
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.B mdb_copy
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utility copies an LMDB environment. The environment can
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be copied regardless of whether it is currently in use.
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No lockfile is created, since it gets recreated at need.
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If
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.I dstpath
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is specified it must be the path of an empty directory
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for storing the backup. Otherwise, the backup will be
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written to stdout.
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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 \-c
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Compact while copying. Only current data pages will be copied; freed
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or unused pages will be omitted from the copy. This option will
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slow down the backup process as it is more CPU-intensive.
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Currently it fails if the environment has suffered a page leak.
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.TP
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.BR \-n
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Open LDMB environment(s) which do 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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.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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.SH CAVEATS
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This utility can trigger significant file size growth if run
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in parallel with write transactions, because pages which they
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free during copying cannot be reused until the copy is done.
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.SH "SEE ALSO"
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.BR mdb_stat (1)
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.SH AUTHOR
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Howard Chu of Symas Corporation <http://www.symas.com>
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