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db5.3_checkpoint - Online in the Cloud

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PROGRAM:

NAME


db5.3_checkpoint - Periodically checkpoint transactions

SYNOPSIS


db5.3_checkpoint [-1Vv] [-h home] [-k kbytes] [-L file] [-P password] [-p min]

DESCRIPTION


The db5.3_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 db5.3_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 db5.3_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 db5.3_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, db5.3_checkpoint should always be given the chance to
detach from the environment and exit gracefully. To cause db5.3_checkpoint to release all
environment resources and exit cleanly, send it an interrupt signal (SIGINT).

The db5.3_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 db5.3_checkpoint utility should be
started.

The DB_ENV->txn_checkpoint method is the underlying method used by the db5.3_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 db5.3_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 <[email protected]>, for the Debian
system (but may be used by others).

28 January 2005 DB5.3_CHECKPOINT(1)

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