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55 lines
1.5 KiB
55 lines
1.5 KiB
.TH MDB_COPY 1 "2014/07/01" "LMDB 0.9.14" |
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.\" Copyright 2012-2021 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_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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.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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.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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