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DB_RECOVER(1) BerkeleyDB Utilities DB_RECOVER(1)
NAME
db_recover - Recover the database to a consistent state
SYNOPSIS
db_recover [-cefVv] [-h home] [-P password] [-t [[CC]YY]MMDDhhmm[.SS]]]
DESCRIPTION
The db_recover utility must be run after an unexpected application, Berkeley DB, or system
failure to restore the database to a consistent state. All committed transactions are
guaranteed to appear after db_recover has run, and all uncommitted transactions will be
completely undone.
Note that this utility performs the same action as if the environment is opened with the
DB_RECOVER flag. If DB_RECOVER is specified on environment open, then use of this utility
is not necessary.
OPTIONS
-c Perform catastrophic recovery instead of normal recovery.
-e Retain the environment after running recovery. This option will rarely be used
unless a DB_CONFIG file is present in the home directory. If a DB_CONFIG file is
not present, then the regions will be created with default parameter values.
-f Display a message on the standard output showing the percent of recovery completed.
-h home
Specify a home directory for the database environment; by default, the current
working directory is used.
-P password
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.
-t Recover to the time specified rather than to the most current possible date. The
timestamp argument should be in the form [[CC]YY]MMDDhhmm[.SS] where each pair of
letters represents the following:
CC The first two digits of the year (the century).
YY The second two digits of the year. If "YY" is specified, but "CC" is not, a
value for "YY" between 69 and 99 results in a "CC" value of 19. Otherwise,
a "YY" value of 20 is used.
MM The month of the year, from 1 to 12.
DD The day of the month, from 1 to 31.
hh The hour of the day, from 0 to 23.
mm The minute of the hour, from 0 to 59.
SS The second of the minute, from 0 to 61.
If the "CC" and "YY" letter pairs are not specified, the values default to the cur-
rent year. If the "SS" letter pair is not specified, the value defaults to 0.
-V Write the library version number to the standard output, and exit.
-v Run in verbose mode.
In the case of catastrophic recovery, an archival copy - or snapshot - of all database
files must be restored along with all of the log files written since the database file
snapshot was made. (If disk space is a problem, log files may be referenced by symbolic
links).
If the failure was not catastrophic, the files present on the system at the time of fail-
ure are sufficient to perform recovery.
If log files are missing, db_recover will identify the missing log file(s) and fail, in
which case the missing log files need to be restored and recovery performed again.
The db_recover 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, db_recover should always be given the chance to detach from the environ-
ment and exit gracefully. To cause db_recover to release all environment resources and
exit cleanly, send it an interrupt signal (SIGINT).
EXIT STATUS
The db_recover utility exits 0 on success, and >0 if an error occurs.
ENVIRONMENT
DB_HOME
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 in DB_ENV->open.
NOTES
If the application(s) that use the environment make use of any of the following methods:
DB_ENV->add_data_dir
DB_ENV->set_data_dir
DB_ENV->set_lg_dir
then in order for this utility to run correctly, you need a DB_CONFIG file which sets the
proper paths using the add_data_dir, or set_lg_dir configuration parameters.
SEE ALSO
db_archive(1) db_checkpoint(1) db_deadlock(1) db_dump(1) db_hotbackup(1) db_log_verify(1)
db_load(1) db_printlog(1) db_replicate(1) db_stat(1) db_tuner(1) db_upgrade(1) db_ver-
ify(1)
BerkeleyDB 5.3.21 06 December 2016 DB_RECOVER(1)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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