MDB_COPY(1)             FreeBSD General Commands Manual            MDB_COPY(1)

NAME
       mdb_copy - LMDB environment copy tool

SYNOPSIS
       mdb_copy [-V] [-c] [-n] srcpath [dstpath]

DESCRIPTION
       The mdb_copy utility copies an LMDB environment. The environment can be
       copied regardless of whether it is currently in use.  No lockfile is
       created, since it gets recreated at need.

       If dstpath is specified it must be the path of an empty directory for
       storing the backup. Otherwise, the backup will be written to stdout.

OPTIONS
       -V     Write the library version number to the standard output, and
              exit.

       -c     Compact while copying. Only current data pages will be copied;
              freed or unused pages will be omitted from the copy. This option
              will slow down the backup process as it is more CPU-intensive.
              Currently it fails if the environment has suffered a page leak.

       -n     Open LDMB environment(s) which do not use subdirectories.

DIAGNOSTICS
       Exit status is zero if no errors occur.  Errors result in a non-zero
       exit status and a diagnostic message being written to standard error.

CAVEATS
       This utility can trigger significant file size growth if run in
       parallel with write transactions, because pages which they free during
       copying cannot be reused until the copy is done.

SEE ALSO
       mdb_stat(1)

AUTHOR
       Howard Chu of Symas Corporation <http://www.symas.com>

LMDB 0.9.14                       2014/07/01                       MDB_COPY(1)