db_checkpoint(1) - man - phpMan

DB5.3_CHECKPOINT(1)                    General Commands Manual                   DB5.3_CHECKPOINT(1)



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 periodi‐
       cally 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 follow‐
              ing  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 sys‐
               tems 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 environ‐
       ment 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 util‐
       ity. 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 <thijs AT kinkhorst.com>, for the Debian system
       (but may be used by others).



                                           28 January 2005                       DB5.3_CHECKPOINT(1)