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!
60 lines
1.6 KiB
Groff
60 lines
1.6 KiB
Groff
.TH MDB_COPY 1 "2014/06/20" "LMDB 0.9.14"
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.\" Copyright 2012-2015 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_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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.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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