1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<title>WiredTiger: Bulk-load</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtreedata.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
$(document).ready(initResizable);
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
<link href="wiredtiger.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td id="projectlogo"><a href="http://wiredtiger.com/"><img alt="Logo" src="LogoFinal-header.png" alt="WiredTiger" /></a></td>
<td style="padding-left: 0.5em;">
<div id="projectname">
 <span id="projectnumber">Version 3.2.1</span>
</div>
<div id="projectbrief"><!-- 3.2.1 --></div>
</td>
</tr>
</tbody>
</table>
</div>
<div class="banner">
<a href="https://github.com/wiredtiger/wiredtiger">Fork me on GitHub</a>
<a class="last" href="http://groups.google.com/group/wiredtiger-users">Join my user group</a>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.13 -->
<script type="text/javascript" src="menudata.js"></script>
<script type="text/javascript" src="menu.js"></script>
<script type="text/javascript">
$(function() {
initMenu('',false,false,'search.php','Search');
});
</script>
<div id="main-nav"></div>
</div><!-- top -->
<div id="side-nav" class="ui-resizable side-nav-resizable">
<div id="nav-tree">
<div id="nav-tree-contents">
<div id="nav-sync" class="sync"></div>
</div>
</div>
<div id="splitbar" style="-moz-user-select:none;"
class="ui-resizable-handle">
</div>
</div>
<script type="text/javascript">
$(document).ready(function(){initNavTree('tune_bulk_load.html','');});
</script>
<div id="doc-content">
<div class="header">
<div class="headertitle">
<div class="title">Bulk-load </div> </div>
</div><!--header-->
<div class="contents">
<div class="textblock"><p>When loading a large amount of data into a new object, using a cursor with the <code>bulk</code> configuration string enabled and loading the data in sorted order will be much faster than doing out-of-order inserts.</p>
<p>WiredTiger cursors can be configured for bulk-load using the <code>bulk</code> configuration keyword to <a class="el" href="struct_w_t___s_e_s_s_i_o_n.html#afb5b4a69c2c5cafe411b2b04fdc1c75d" title="Open a new cursor on a data source or duplicate an existing cursor. ">WT_SESSION::open_cursor</a>. Bulk-load is a "fast
path" for quickly loading a large number of rows. Bulk-load may only be used on newly created objects, and an object being bulk-loaded is not accessible from other cursors.</p>
<p>Cursors configured for bulk-load only support the <a class="el" href="struct_w_t___c_u_r_s_o_r.html#aac90d9fbcc031570f924db55f8a1cee3" title="Insert a record and optionally update an existing record. ">WT_CURSOR::insert</a> and <a class="el" href="struct_w_t___c_u_r_s_o_r.html#aeea071f192cab12245a50fbe71c3460b" title="Close the cursor. ">WT_CURSOR::close</a> methods. Bulk load inserts are non-transactional: they cannot be rolled back and ignore the transactional state of the <a class="el" href="struct_w_t___s_e_s_s_i_o_n.html" title="All data operations are performed in the context of a WT_SESSION. ">WT_SESSION</a> in which they are opened.</p>
<p>When doing a bulk-load insert, keys must be inserted in sorted order. When doing a bulk-load insert into a column-store object, any skipped records will be created as already-deleted rows. If a column-store bulk-load cursor is configured with <code>append</code>, the cursor key will be ignored and each inserted row will be assigned the next sequential record number.</p>
<p>When using the <code>sort</code> utility on a Linux or other POSIX-like system to pre-sort keys, the locale specified by the environment affects the sort order and may not match the default sort order used by WiredTiger. Set <code>LC_ALL=C</code> in the process' environment to configure the traditional sort order that uses native byte values.</p>
<p>When bulk-loading fixed-length column store objects, the <code>bulk</code> configuration string value <code>bitmap</code> allows chunks of a memory resident bitmap to be loaded directly into an object by passing a <a class="el" href="group__wt.html#struct_w_t___i_t_e_m" title="A raw item of data to be managed, including a pointer to the data and a length. ">WT_ITEM</a> to <a class="el" href="struct_w_t___c_u_r_s_o_r.html#a27f7cbd0cd3e561f6a145704813ad64c" title="Set the value for the next operation. ">WT_CURSOR::set_value</a>, where the size field indicates the number of records in the bitmap (as specified by the object's <code>value_format</code> configuration). Bulk-loaded bitmap values must end on a byte boundary relative to the bit count (except for the last set of values loaded). </p>
</div></div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
<ul>
<li class="navelem"><a class="el" href="index.html">Reference Guide</a></li><li class="navelem"><a class="el" href="programming_lang_java.html">Writing WiredTiger applications in Java</a></li>
<li class="footer">Copyright (c) 2008-2019 MongoDB, Inc. All rights reserved. Contact <a href="mailto:info@wiredtiger.com">info@wiredtiger.com</a> for more information.</li>
</ul>
</div>
</body>
</html>
|
