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DB5.3_RECOVER(1) General Commands Manual DB5.3_RECOVER(1)
NAME
db5.3_recover - Restore the database to a consistent state
SYNOPSIS
db5.3_recover [-ceVv] [-h home] [-P password] [-t [[CC]YY]MMDDhhmm[.SS]]]
DESCRIPTION
The db5.3_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 db5.3_recover has run, and all uncommitted transactions
will be completely undone.
OPTIONS
-c Perform catastrophic recovery instead of normal recovery.
-e Retain the environment after running recovery. This option will rarely be used un-
less 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.
-h Specify a home directory for the database environment; by default, the current
working directory is used.
-P 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, db5.3_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 db5.3_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 Berke-
ley DB environment, db5.3_recover should always be given the chance to detach from the en-
vironment and exit gracefully. To cause db5.3_recover to release all environment re-
sources and exit cleanly, send it an interrupt signal (SIGINT).
The db5.3_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.
AUTHORS
Sleepycat Software, Inc. This manual page was created based on the HTML documentation for
db_recover from Sleepycat, by Thijs Kinkhorst <thijs AT kinkhorst.com>, for the Debian system
(but may be used by others).
28 January 2005 DB5.3_RECOVER(1)
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