db_checkpoint
db_checkpoint(1) General Commands Manual db_checkpoint(1)
NAME
db_checkpoint
SYNOPSIS
db_checkpoint [-1Vv] [-h home] [-k kbytes] [-L file] [-P password] [-p min]
DESCRIPTION
The db_checkpoint utility is a daemon process that monitors the database
log, and periodically calls DB_ENV->txn_checkpoint to checkpoint it.
The options are as follows:
-1
Checkpoint the log once, regardless of whether or not there has been
activity since the last checkpoint and then exit.
-h
Specify a home directory for the database environment; by default, the
current working directory is used.
-k
Checkpoint the database at least as often as every kbytes of log file are
written.
-L
Log the execution of the db_checkpoint utility to the specified file in
the following format, where ### is the process ID, and the date is the
time the utility was started.
db_checkpoint: ### Wed Jun 15 01:23:45 EDT 1995
This file will be removed if the db_checkpoint utility exits gracefully.
-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.
-p
Checkpoint the database at least every min minutes if there has been any
activity since the last checkpoint.
-V
Write the library version number to the standard output, and exit.
-v
Write the time of each checkpoint attempt to the standard output.
At least one of the -1, -k, and -p options must be specified.
The db_checkpoint 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_checkpoint
should always be given the chance to detach from the environment and exit
gracefully. To cause db_checkpoint to release all environment resources and
exit cleanly, send it an interrupt signal (SIGINT).
The db_checkpoint utility does not attempt to create the Berkeley DB shared
memory regions if they do not already exist. The application that creates
the region should be started first, and once the region is created, the
db_checkpoint utility should be started.
The DB_ENV->txn_checkpoint method is the underlying method used by the
db_checkpoint utility. See the db_checkpoint utility source code for an
example of using DB_ENV->txn_checkpoint in a IEEE/ANSI Std 1003.1 (POSIX)
environment.
The db_checkpoint 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.
SEE ALSO
db_archive(1), db_deadlock(1), db_dump(1), db_load(1), db_printlog(1),
db_recover(1), db_stat(1), db_upgrade(1), db_verify(1)
Darwin December 3, 2003 Darwin