Man page of DB4.4_ARCHIVE
Section: User Commands (1)
Updated: 28 January 2005
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db4.4_archive - Find unused log files for archiving purposes
[-adlsVv] [-h home] [-P password]
The db4.4_archive utility writes the pathnames of log files that
are no longer in use (for example, no longer involved in active
transactions), to the standard output, one pathname per line. These
log files should be written to backup media to provide for recovery in
the case of catastrophic failure (which also requires a snapshot of the
database files), but they may then be deleted from the system to reclaim
Write all pathnames as absolute pathnames, instead of relative to the
database home directories.
Remove log files that are no longer needed; no filenames are written.
Automatic log file removal is likely to make catastrophic recovery
Specify a home directory for the database environment; by
default, the current working directory is used.
Write out the pathnames of all the database log files, whether or not
they are involved in active transactions.
Specify an environment password. Although Berkeley DB utilities overwrite
password strings as soon as possible, be aware there may be a window of
vulnerability on systems where unprivileged users can see command-line
arguments or where utilities are not able to overwrite the memory
containing the command-line arguments.
Write the pathnames of all the database files that need to be archived
in order to recover the database from catastrophic failure. If any of
the database files have not been accessed during the lifetime of the
current log files, db4.4_archive will not include them in this
It is possible that some of the files to which the log refers have since
been deleted from the system. In this case, db4.4_archive will
ignore them. When db4.4_recover is run, any files to which the
log refers that are not present during recovery are assumed to have been
deleted and will not be recovered.
Write the library version number to the standard output, and exit.
Run in verbose mode, listing the checkpoints in the log files as they
Log cursor handles (returned by the DB_ENV->log_cursor method) may have open
file descriptors for log files in the database environment. Also, the
Berkeley DB interfaces to the database environment logging subsystem (for
example, DB_ENV->log_put and DB_TXN->abort) may allocate log cursors
and have open file descriptors for log files as well. On operating
systems where filesystem related system calls (for example, rename and
unlink on Windows/NT) can fail if a process has an open file descriptor
for the affected file, attempting to move or remove the log files listed
by db4.4_archive may fail. All Berkeley DB internal use of log cursors
operates on active log files only and furthermore, is short-lived in
nature. So, an application seeing such a failure should be restructured
to close any open log cursors it may have, and otherwise to retry the
operation until it succeeds. (Although the latter is not likely to be
necessary; it is hard to imagine a reason to move or rename a log file
in which transactions are being logged or aborted.)
The db4.4_archive utility uses a Berkeley DB environment (as described for the
-h option, the environment variable DB_HOME, or
because the utility was run in a directory containing a Berkeley DB
environment). In order to avoid environment corruption when using a
Berkeley DB environment, db4.4_archive should always be given the chance to
detach from the environment and exit gracefully. To cause db4.4_archive
to release all environment resources and exit cleanly, send it an
interrupt signal (SIGINT).
The DB_ENV->log_archive method is the underlying method used by the db4.4_archive utility.
See the db4.4_archive utility source code for an example of using
DB_ENV->log_archive in a IEEE/ANSI Std 1003.1 (POSIX) environment.
The db4.4_archive utility exits 0 on success, and >0 if an error occurs.
If the -h option is not specified and the environment variable
DB_HOME is set, it is used as the path of the database home, as described
Sleepycat Software, Inc. This manual page was created based on
the HTML documentation for db_archive from Sleepycat,
by Thijs Kinkhorst <[email protected]>,
for the Debian system (but may be used by others).
This document was created by
using the manual pages.
Time: 03:41:10 GMT, September 24, 2010