NAME
db4.8_upgrade - Upgrade the Berkeley DB version to the current release
version.
SYNOPSIS
db4.8_upgrade [-NsVv] [-h home] [-P password] file ...
DESCRIPTION
The db4.8_upgrade utility upgrades the Berkeley DB version of one or
more files and the databases they contain to the current release
version.
OPTIONS
-h Specify a home directory for the database environment; by
default, the current working directory is used.
-N Do not acquire shared region mutexes while running. Other
problems, such as potentially fatal errors in Berkeley DB, will
be ignored as well. This option is intended only for debugging
errors, and should not be used under any other circumstances.
-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.
-s This flag is only meaningful when upgrading databases from
releases before the Berkeley DB 3.1 release.
As part of the upgrade from the Berkeley DB 3.0 release to the
3.1 release, the on-disk format of duplicate data items changed.
To correctly upgrade the format requires that applications
specify whether duplicate data items in the database are sorted
or not. Specifying the -s flag means that the duplicates are
sorted; otherwise, they are assumed to be unsorted. Incorrectly
specifying the value of this flag may lead to database
corruption.
Because the db4.8_upgrade utility upgrades a physical file
(including all the databases it contains), it is not possible to
use db4.8_upgrade to upgrade files where some of the databases
it includes have sorted duplicate data items, and some of the
databases it includes have unsorted duplicate data items. If the
file does not have more than a single database, if the databases
do not support duplicate data items, or if all the databases
that support duplicate data items support the same style of
duplicates (either sorted or unsorted), db4.8_upgrade will work
correctly as long as the -s flag is correctly specified.
Otherwise, the file cannot be upgraded using db4.8_upgrade, and
must be upgraded manually using the db4.8_dump and db4.8_load
utilities.
-V Write the library version number to the standard output, and
exit.
-v Run in verbose mode, displaying a message for each successful
upgrade.
It is important to realize that Berkeley DB database upgrades are done
in place, and so are potentially destructive. This means that if the
system crashes during the upgrade procedure, or if the upgrade
procedure runs out of disk space, the databases may be left in an
inconsistent and unrecoverable state.
The db4.8_upgrade utility may be used with 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, db4.8_upgrade should always be given the
chance to detach from the environment and exit gracefully. To cause
db4.8_upgrade to release all environment resources and exit cleanly,
send it an interrupt signal (SIGINT).
The db4.8_upgrade 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_upgrade from Sleepycat, by Thijs Kinkhorst
<thijs@kinkhorst.com>, for the Debian system (but may be used by
others).
28 January 2005