NAME¶
db5.1_recover - Restore the database to a consistent state
SYNOPSIS¶
db5.1_recover [-ceVv] [-h home] [-P password] [-t [[CC]YY]MMDDhhmm[.SS]]]
DESCRIPTION¶
The db5.1_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 db5.1_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, db5.1_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 db5.1_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,
db5.1_recover should always be given the chance to detach from the environment
and exit gracefully. To cause db5.1_recover to release all environment
resources and exit cleanly, send it an interrupt signal (SIGINT).
The db5.1_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).
