NAME
db4.7_recover - Restore the database to a consistent state
SYNOPSIS
db4.7_recover [-ceVv] [-h home] [-P password] [-t
[[CC]YY]MMDDhhmm[.SS]]]
DESCRIPTION
The db4.7_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
db4.7_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 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.
-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 current 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 failure are sufficient to perform recovery.
If log files are missing, db4.7_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 db4.7_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, db4.7_recover should always be given the chance to detach
from the environment and exit gracefully. To cause db4.7_recover to
release all environment resources and exit cleanly, send it an
interrupt signal (SIGINT).
The db4.7_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@kinkhorst.com>, for the Debian system (but may be used by
others).
28 January 2005