NAME
db4.7_checkpoint - Periodically checkpoint transactions
SYNOPSIS
db4.7_checkpoint [-1Vv] [-h home] [-k kbytes] [-L file] [-P password]
[-p min]
DESCRIPTION
The db4.7_checkpoint utility is a daemon process that monitors the
database log, and periodically calls DB_ENV->txn_checkpoint to
checkpoint it.
OPTIONS
-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 db4.7_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 db4.7_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 db4.7_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, db4.7_checkpoint should always be given the
chance to detach from the environment and exit gracefully. To cause
db4.7_checkpoint to release all environment resources and exit cleanly,
send it an interrupt signal (SIGINT).
The db4.7_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 db4.7_checkpoint utility should be started.
The DB_ENV->txn_checkpoint method is the underlying method used by the
db4.7_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 db4.7_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.
AUTHORS
Sleepycat Software, Inc. This manual page was created based on the HTML
documentation for db_checkpoint from Sleepycat, by Thijs Kinkhorst
<thijs@kinkhorst.com>, for the Debian system (but may be used by
others).
28 January 2005