The db_load utility reads from the standard input and loads it
into the database file. The database file is created if
it does not already exist.
The input to db_load must be in the output format specified by the
db_dump utility, utilities, or as specified for the -T
The options are as follows:
Specify configuration options ignoring any value they may have based on
the input. The command-line format is name=value. See
Supported Keywords for a
list of supported words for the -c option.
Read from the specified input file instead of from the standard
Specify a home directory for the database environment.
If a home directory is specified, the database environment is opened using
the DB_INIT_LOCK, DB_INIT_LOG, DB_INIT_MPOOL,
DB_INIT_TXN and DB_USE_ENVIRON flags to
DBENV->open. (This means that db_load can be used to load
data into databases while they are in use by other processes.) If the
DBENV->open call fails, or if no home directory is specified, the
database is still updated, but the environment is ignored, e.g., no
locking is done.
Do not overwrite existing keys in the database when loading into an
already existing database. If a key/data pair cannot be loaded into the
database for this reason, a warning message is displayed on the standard
error output and the key/data pair are skipped.
The -T option allows non-Berkeley DB applications to easily load text
files into databases.
If the database to be created is of type Btree or Hash, or the keyword
keys is specified as set, the input must be paired lines of text,
where the first line of the pair is the key item, and the second line of
the pair is its corresponding data item. If the database to be created
is of type Queue or Recno and the keywork keys is not set, the
input must be lines of text, where each line is a new data item for the
A simple escape mechanism, where newline and backslash (\)
characters are special, is applied to the text input. Newline characters
are interpreted as record separators. Backslash characters in the text
will be interpreted in one of two ways: if the backslash character
precedes another backslash character, the pair will be interpreted as a
literal backslash. If the backslash character precedes any other
character, the two characters following the backslash will be interpreted
as hexadecimal specification of a single character, e.g., \0a
is a newline character in the ASCII character set.
For this reason, any backslash or newline characters that naturally
occur in the text input must be escaped to avoid misinterpretation by
If the -T option is specified, the underlying access method type
must be specified using the -t option.
Specify the underlying access method. If no -t option is
specified, the database will be loaded into a database of the same type
as was dumped, e.g., a Hash database will be created if a Hash database
Btree and Hash databases may be converted from one to the other. Queue
and Recno databases may be converted from one to the other. If the
-k option was specified on the call to db_dump then Queue
and Recno databases may be converted to Btree or Hash, with the key being
the integer record number.
Write the version number to the standard output and exit.
The db_load 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, db_load should always be given the chance to detach from
the environment and exit gracefully. To cause db_load to release all
environment resources and exit cleanly, send it an interrupt signal
The db_load utility exits 0 on success, 1 if one or more key/data
pairs were not loaded into the database because the key already existed,
and >1 if an error occurs.
The db_load utility can be used to load text files into databases.
For example, the following command loads the standard UNIX
/etc/passwd file into a database, with the login name as the
key item and the entire password entry as the data item:
Note that backslash characters naturally occurring in the text are escaped
to avoid interpretation as escape characters by db_load.
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
The following keywords are supported for the -c command-line
option to the db_load utility. See DB->open for further
discussion of these keywords and what values should be specified.
The parenthetical listing specifies how the value part of the
name=value pair is interpreted. Items listed as (boolean) expect
value to be 1 (set) or 0 (unset). Items listed as
(number) convert value to a number. Items listed as (string) use the
string value without modification.
The minimum number of keys per page.
The database to load.
The byte order for integers in the stored database metadata.
The size of pages used for nodes in the tree, in bytes.