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Berkeley DB Reference Guide:
Access Methods

Access method operations

Once a database handle has been created using db_create, there are several standard access method operations. Each of these operations is performed using a method referred to by the returned handle. Generally, the database will be opened using DB->open. If the database is from an old release of Berkeley DB, it may need to be upgraded to the current release before it is opened using DB->upgrade.

Once a database has been opened, records may be retrieved (DB->get), stored (DB->put), and deleted (DB->del).

Additional operations supported by the database handle include statistics (DB->stat), truncation (DB->truncate), version upgrade (DB->upgrade), verification and salvage (DB->verify), flushing to a backing file (DB->sync), and association of secondary indices (DB->associate). Database handles are eventually closed using DB->close.

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Databases and Related Methods Description

DB->associate Associate a secondary index

DB->close Close a database

DB->cursor Create a cursor handle

DB->del Delete items from a database

DB->err Error message with error string

DB->errx Error message

DB->fd Return a file descriptor from a database

DB->get Get items from a database

DB->get_byteswapped Return if the underlying database is in host order

DB->get_type Return the database type

DB->join Perform a database join on cursors

DB->key_range Return estimate of key location

DB->open Open a database

DB->pget Get items from a database

DB->put Store items into a database

DB->remove Remove a database

DB->rename Rename a database

DB->set_alloc Set local space allocation functions

DB->set_append_recno Set record append callback

DB->set_bt_compare Set a Btree comparison function

DB->set_bt_minkey Set the minimum number of keys per Btree page

DB->set_bt_prefix Set a Btree prefix comparison function

DB->set_cache_priority Set the database cache priority

DB->set_cachesize Set the database cache size

DB->set_dup_compare Set a duplicate comparison function

DB->set_encrypt Set the database cryptographic key

DB->set_errcall Set error message callback

DB->set_errfile Set error message FILE

Db::set_error_stream Set error message output stream

DB->set_errpfx Set error message prefix

DB->set_feedback Set feedback callback

DB->set_flags General database configuration

DB->set_h_ffactor Set the Hash table density

DB->set_h_hash Set a hashing function

DB->set_h_nelem Set the Hash table size

DB->set_lorder Set the database byte order

DB->set_pagesize Set the underlying database page size

DB->set_paniccall Set panic callback

DB->set_q_extentsize Set Queue database extent size

DB->set_re_delim Set the variable-length record delimiter

DB->set_re_len Set the fixed-length record length

DB->set_re_pad Set the fixed-length record pad byte

DB->set_re_source Set the backing Recno text file

DB->stat Return database statistics

DB->sync Flush a database to stable storage

DB->truncate Empty a database

DB->upgrade Upgrade a database

DB->verify Verify/salvage a database

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Databases and Related Methods	Description
DB->associate	Associate a secondary index
DB->close	Close a database
DB->cursor	Create a cursor handle
DB->del	Delete items from a database
DB->err	Error message with error string
DB->errx	Error message
DB->fd	Return a file descriptor from a database
DB->get	Get items from a database
DB->get_byteswapped	Return if the underlying database is in host order
DB->get_type	Return the database type
DB->join	Perform a database join on cursors
DB->key_range	Return estimate of key location
DB->open	Open a database
DB->pget	Get items from a database
DB->put	Store items into a database
DB->remove	Remove a database
DB->rename	Rename a database
DB->set_alloc	Set local space allocation functions
DB->set_append_recno	Set record append callback
DB->set_bt_compare	Set a Btree comparison function
DB->set_bt_minkey	Set the minimum number of keys per Btree page
DB->set_bt_prefix	Set a Btree prefix comparison function
DB->set_cache_priority	Set the database cache priority
DB->set_cachesize	Set the database cache size
DB->set_dup_compare	Set a duplicate comparison function
DB->set_encrypt	Set the database cryptographic key
DB->set_errcall	Set error message callback
DB->set_errfile	Set error message FILE
Db::set_error_stream	Set error message output stream
DB->set_errpfx	Set error message prefix
DB->set_feedback	Set feedback callback
DB->set_flags	General database configuration
DB->set_h_ffactor	Set the Hash table density
DB->set_h_hash	Set a hashing function
DB->set_h_nelem	Set the Hash table size
DB->set_lorder	Set the database byte order
DB->set_pagesize	Set the underlying database page size
DB->set_paniccall	Set panic callback
DB->set_q_extentsize	Set Queue database extent size
DB->set_re_delim	Set the variable-length record delimiter
DB->set_re_len	Set the fixed-length record length
DB->set_re_pad	Set the fixed-length record pad byte
DB->set_re_source	Set the backing Recno text file
DB->stat	Return database statistics
DB->sync	Flush a database to stable storage
DB->truncate	Empty a database
DB->upgrade	Upgrade a database
DB->verify	Verify/salvage a database

Berkeley DB Reference Guide:Access Methods

Access method operations

Berkeley DB Reference Guide:
Access Methods