mdb_copy − LMDB environment copy tool
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.
is specified it must be the path of an empty directory
for storing the backup. Otherwise, the backup will be
written to stdout.
Write the library version number to the standard output, and exit.
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.
Open LDMB environment(s) which do not use subdirectories.
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.
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.