DB4.8_RECOVER(1)
NAME
db4.8_recover - Restore the database to a consistent state
SYNOPSIS
db4.8_recover [-ceVv] [-h home] [-P password] [-t [[CC]YY]MMD- Dhhmm[.SS]]]
DESCRIPTION
The db4.8_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
db4.8_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, db4.8_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 db4.8_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, db4.8_recover should always be given the chance to detach from the environment and exit gracefully. To cause db4.8_recover to release all environment resources and exit cleanly, send it an interrupt signal (SIGINT).
- The db4.8_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).