Provided by: db5.3-util_5.3.28+dfsg2-7_amd64 
NAME
db5.3_load - Load data from standard input
SYNOPSIS
db5.3_load [-nTV] [-c name=value] [-f file] [-h home] [-P password] [-t btree | hash | queue | recno]
file
db5.3_load [-r lsn | fileid] [-h home] [-P password] file
DESCRIPTION
The db5.3_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 db5.3_load must be in the output format specified by the db5.0_dump utility, utilities, or
as specified for the -T below.
OPTIONS
-c Specify configuration options ignoring any value they may have based on the input. The command-
line format is name=value. See the Supported Keywords section below for a list of keywords
supported by the -c option.
-f Read from the specified input file instead of from the standard input.
-h 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 DB_ENV->open. (This means
that db5.3_load can be used to load data into databases while they are in use by other processes.)
If the DB_ENV->open call fails, or if no home directory is specified, the database is still
updated, but the environment is ignored; for example, no locking is done.
-n 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.
-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.
-r Reset the database's file ID or log sequence numbers (LSNs).
All database pages in transactional environments contain references to the environment's log
records. In order to copy a database into a different database environment, database page
references to the old environment's log records must be reset, otherwise data corruption can occur
when the database is modified in the new environment. The -r lsn option resets a database's log
sequence numbers.
All databases contain an ID string used to identify the database in the database environment
cache. If a database is copied, and used in the same environment as another file with the same ID
string, corruption can occur. The -r fileid option resets a database's file ID to a new value.
In both cases, the physical file specified by the file argument is modified in-place.
-T 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 keyword keys is not set, the input must be lines of text, where each line
is a new data item for the database.
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 a hexadecimal specification of a single character; for example, \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 db5.3_load.
If the -T option is specified, the underlying access method type must be specified using the -t
option.
-t 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; for example, a Hash database will be created if a
Hash database was dumped.
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 db5.3_dump then
Queue and Recno databases may be converted to Btree or Hash, with the key being the integer record
number.
-V Write the library version number to the standard output, and exit.
The db5.3_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, db5.3_load
should always be given the chance to detach from the environment and exit gracefully. To cause
db5.3_load to release all environment resources and exit cleanly, send it an interrupt signal (SIGINT).
The db5.3_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.
EXAMPLES
The db5.3_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:
awk -F: '{print $1; print $0}' < /etc/passwd |
sed 's/\\/\\\\/g' | db5.3_load -T -t hash passwd.db
Note that backslash characters naturally occurring in the text are escaped to avoid interpretation as
escape characters by db5.3_load.
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.
SUPPORTED KEYWORDS
The following keywords are supported for the -c command-line ption to the db5.3_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.
bt_minkey (number)
The minimum number of keys per page.
chksum (boolean)
Enable page checksums.
database (string)
The database to load.
db_lorder (number)
The byte order for integers in the stored database metadata.
db_pagesize (number)
The size of database pages, in bytes.
duplicates (boolean)
The value of the DB_DUP flag.
dupsort (boolean)
The value of the DB_DUPSORT flag.
extentsize (number)
The size of database extents, in pages, for Queue databases configured to use extents.
h_ffactor (number)
The density within the Hash database.
h_nelem (number)
The size of the Hash database.
keys (boolean)
Specify whether keys are present for Queue or Recno databases.
re_len (number)
Specify fixed-length records of the specified length.
re_pad (string)
Specify the fixed-length record pad character.
recnum (boolean)
The value of the DB_RECNUM flag.
renumber (boolean)
The value of the DB_RENUMBER flag.
subdatabase (string)
The subdatabase to load.
AUTHORS
Sleepycat Software, Inc. This manual page was created based on the HTML documentation for db_load from
Sleepycat, by Thijs Kinkhorst <thijs@kinkhorst.com>, for the Debian system (but may be used by others).
22 November 2009 DB5.3_LOAD(1)