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<title>Berkeley DB Reference Guide: Access method operations</title>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Access Methods</dl></h3></td>
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<h1 align=center>Access method operations</h1>
<p>Once a database handle has been created using <a href="../../api_c/db_create.html">db_create</a>, 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 <a href="../../api_c/db_open.html">DB->open</a>. 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 <a href="../../api_c/db_upgrade.html">DB->upgrade</a>.
<p>Once a database has been opened, records may be retrieved (<a href="../../api_c/db_get.html">DB->get</a>),
stored (<a href="../../api_c/db_put.html">DB->put</a>), and deleted (<a href="../../api_c/db_del.html">DB->del</a>).
<p>Additional operations supported by the database handle include
statistics (<a href="../../api_c/db_stat.html">DB->stat</a>), truncation (<a href="../../api_c/db_truncate.html">DB->truncate</a>),
version upgrade (<a href="../../api_c/db_upgrade.html">DB->upgrade</a>), verification and salvage
(<a href="../../api_c/db_verify.html">DB->verify</a>), flushing to a backing file (<a href="../../api_c/db_sync.html">DB->sync</a>),
and association of secondary indices (<a href="../../api_c/db_associate.html">DB->associate</a>). Database
handles are eventually closed using <a href="../../api_c/db_close.html">DB->close</a>.
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<tr><th>Databases and Related Methods</th><th>Description</th></tr>
<tr><td><a href="../../api_c/db_associate.html">DB->associate</a></td><td>Associate a secondary index</td></tr>
<tr><td><a href="../../api_c/db_close.html">DB->close</a></td><td>Close a database</td></tr>
<tr><td><a href="../../api_c/db_cursor.html">DB->cursor</a></td><td>Create a cursor handle</td></tr>
<tr><td><a href="../../api_c/db_del.html">DB->del</a></td><td>Delete items from a database</td></tr>
<tr><td><a href="../../api_c/db_err.html">DB->err</a></td><td>Error message with error string</td></tr>
<tr><td><a href="../../api_c/db_err.html">DB->errx</a></td><td>Error message</td></tr>
<tr><td><a href="../../api_c/db_fd.html">DB->fd</a></td><td>Return a file descriptor from a database</td></tr>
<tr><td><a href="../../api_c/db_get.html">DB->get</a></td><td>Get items from a database</td></tr>
<tr><td><a href="../../api_c/db_get_byteswapped.html">DB->get_byteswapped</a></td><td>Return if the underlying database is in host order</td></tr>
<tr><td><a href="../../api_c/db_get_type.html">DB->get_type</a></td><td>Return the database type</td></tr>
<tr><td><a href="../../api_c/db_join.html">DB->join</a></td><td>Perform a database join on cursors</td></tr>
<tr><td><a href="../../api_c/db_key_range.html">DB->key_range</a></td><td>Return estimate of key location</td></tr>
<tr><td><a href="../../api_c/db_open.html">DB->open</a></td><td>Open a database</td></tr>
<tr><td><a href="../../api_c/db_get.html">DB->pget</a></td><td>Get items from a database</td></tr>
<tr><td><a href="../../api_c/db_put.html">DB->put</a></td><td>Store items into a database</td></tr>
<tr><td><a href="../../api_c/db_remove.html">DB->remove</a></td><td>Remove a database</td></tr>
<tr><td><a href="../../api_c/db_rename.html">DB->rename</a></td><td>Rename a database</td></tr>
<tr><td><a href="../../api_c/db_set_alloc.html">DB->set_alloc</a></td><td>Set local space allocation functions</td></tr>
<tr><td><a href="../../api_c/db_set_append_recno.html">DB->set_append_recno</a></td><td>Set record append callback</td></tr>
<tr><td><a href="../../api_c/db_set_bt_compare.html">DB->set_bt_compare</a></td><td>Set a Btree comparison function</td></tr>
<tr><td><a href="../../api_c/db_set_bt_minkey.html">DB->set_bt_minkey</a></td><td>Set the minimum number of keys per Btree page</td></tr>
<tr><td><a href="../../api_c/db_set_bt_prefix.html">DB->set_bt_prefix</a></td><td>Set a Btree prefix comparison function</td></tr>
<tr><td><a href="../../api_c/db_set_cache_priority.html">DB->set_cache_priority</a></td><td>Set the database cache priority</td></tr>
<tr><td><a href="../../api_c/db_set_cachesize.html">DB->set_cachesize</a></td><td>Set the database cache size</td></tr>
<tr><td><a href="../../api_c/db_set_dup_compare.html">DB->set_dup_compare</a></td><td>Set a duplicate comparison function</td></tr>
<tr><td><a href="../../api_c/db_set_encrypt.html">DB->set_encrypt</a></td><td>Set the database cryptographic key</td></tr>
<tr><td><a href="../../api_c/db_set_errcall.html">DB->set_errcall</a></td><td>Set error message callback</td></tr>
<tr><td><a href="../../api_c/db_set_errfile.html">DB->set_errfile</a></td><td>Set error message FILE</td></tr>
<tr><td><a href="../../api_cxx/db_set_error_stream.html">Db::set_error_stream</a></td><td>Set error message output stream</td></tr>
<tr><td><a href="../../api_c/db_set_errpfx.html">DB->set_errpfx</a></td><td>Set error message prefix</td></tr>
<tr><td><a href="../../api_c/db_set_feedback.html">DB->set_feedback</a></td><td>Set feedback callback</td></tr>
<tr><td><a href="../../api_c/db_set_flags.html">DB->set_flags</a></td><td>General database configuration</td></tr>
<tr><td><a href="../../api_c/db_set_h_ffactor.html">DB->set_h_ffactor</a></td><td>Set the Hash table density</td></tr>
<tr><td><a href="../../api_c/db_set_h_hash.html">DB->set_h_hash</a></td><td>Set a hashing function</td></tr>
<tr><td><a href="../../api_c/db_set_h_nelem.html">DB->set_h_nelem</a></td><td>Set the Hash table size</td></tr>
<tr><td><a href="../../api_c/db_set_lorder.html">DB->set_lorder</a></td><td>Set the database byte order</td></tr>
<tr><td><a href="../../api_c/db_set_pagesize.html">DB->set_pagesize</a></td><td>Set the underlying database page size</td></tr>
<tr><td><a href="../../api_c/db_set_paniccall.html">DB->set_paniccall</a></td><td>Set panic callback</td></tr>
<tr><td><a href="../../api_c/db_set_q_extentsize.html">DB->set_q_extentsize</a></td><td>Set Queue database extent size</td></tr>
<tr><td><a href="../../api_c/db_set_re_delim.html">DB->set_re_delim</a></td><td>Set the variable-length record delimiter</td></tr>
<tr><td><a href="../../api_c/db_set_re_len.html">DB->set_re_len</a></td><td>Set the fixed-length record length</td></tr>
<tr><td><a href="../../api_c/db_set_re_pad.html">DB->set_re_pad</a></td><td>Set the fixed-length record pad byte</td></tr>
<tr><td><a href="../../api_c/db_set_re_source.html">DB->set_re_source</a></td><td>Set the backing Recno text file</td></tr>
<tr><td><a href="../../api_c/db_stat.html">DB->stat</a></td><td>Return database statistics</td></tr>
<tr><td><a href="../../api_c/db_sync.html">DB->sync</a></td><td>Flush a database to stable storage</td></tr>
<tr><td><a href="../../api_c/db_truncate.html">DB->truncate</a></td><td>Empty a database</td></tr>
<tr><td><a href="../../api_c/db_upgrade.html">DB->upgrade</a></td><td>Upgrade a database</td></tr>
<tr><td><a href="../../api_c/db_verify.html">DB->verify</a></td><td>Verify/salvage a database</td></tr>
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