db_checkpoint(1) - phpMan

DB_CHECKPOINT(1)                       BerkeleyDB Utilities                      DB_CHECKPOINT(1)



NAME
       db_checkpoint - Periodically checkpoint transactions

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 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 home
              Specify  a  home  directory  for  the database environment; by default, the current
              working directory is used.

       -k kbytes
              Checkpoint the database at least as often as every kbytes of log file are written.

       -L file
              Log the execution of the db_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 db_checkpoint utility exits gracefully.

       -P password
              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 min 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  Berke-
       ley  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 util-
       ity. See the db_checkpoint utility source code for an example of using  DB_ENV->txn_check-
       point in a IEEE/ANSI Std 1003.1 (POSIX) environment.

EXIT STATUS
       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_hotbackup(1)   db_log_verify(1)   db_load(1)
       db_printlog(1)  db_recover(1) db_replicate(1) db_stat(1) db_tuner(1) db_upgrade(1) db_ver-
       ify(1)



BerkeleyDB 5.3.21                        06 December 2016                        DB_CHECKPOINT(1)

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