Adding upstream version 3.40.1.upstream/3.40.1 upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-05-05 17:28:19 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-05-05 17:28:19 +0000
commit: 18657a960e125336f704ea058e25c27bd3900dcb (patch)
tree: 17b438b680ed45a996d7b59951e6aa34023783f2 /www/pgszchng2016.html
parent: Initial commit. (diff)
download: sqlite3-18657a960e125336f704ea058e25c27bd3900dcb.tar.xz
sqlite3-18657a960e125336f704ea058e25c27bd3900dcb.zip
1 files changed, 189 insertions, 0 deletions
diff --git a/www/pgszchng2016.html b/www/pgszchng2016.html
new file mode 100644
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--- /dev/null
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@@ -0,0 +1,189 @@
+<!DOCTYPE html>
+<html><head>
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<link href="sqlite.css" rel="stylesheet">
+<title>Change in Default Page Size in SQLite Version 3.12.0</title>
+<!-- path= -->
+</head>
+<body>
+<div class=nosearch>
+<a href="index.html">
+<img class="logo" src="images/sqlite370_banner.gif" alt="SQLite" border="0">
+</a>
+<div><!-- IE hack to prevent disappearing logo --></div>
+<div class="tagline desktoponly">
+Small. Fast. Reliable.<br>Choose any three.
+</div>
+<div class="menu mainmenu">
+<ul>
+<li><a href="index.html">Home</a>
+<li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a>
+<li class='wideonly'><a href='about.html'>About</a>
+<li class='desktoponly'><a href="docs.html">Documentation</a>
+<li class='desktoponly'><a href="download.html">Download</a>
+<li class='wideonly'><a href='copyright.html'>License</a>
+<li class='desktoponly'><a href="support.html">Support</a>
+<li class='desktoponly'><a href="prosupport.html">Purchase</a>
+<li class='search' id='search_menubutton'>
+<a href="javascript:void(0)" onclick='toggle_search()'>Search</a>
+</ul>
+</div>
+<div class="menu submenu" id="submenu">
+<ul>
+<li><a href='about.html'>About</a>
+<li><a href='docs.html'>Documentation</a>
+<li><a href='download.html'>Download</a>
+<li><a href='support.html'>Support</a>
+<li><a href='prosupport.html'>Purchase</a>
+</ul>
+</div>
+<div class="searchmenu" id="searchmenu">
+<form method="GET" action="search">
+<select name="s" id="searchtype">
+<option value="d">Search Documentation</option>
+<option value="c">Search Changelog</option>
+</select>
+<input type="text" name="q" id="searchbox" value="">
+<input type="submit" value="Go">
+</form>
+</div>
+</div>
+<script>
+function toggle_div(nm) {
+var w = document.getElementById(nm);
+if( w.style.display=="block" ){
+w.style.display = "none";
+}else{
+w.style.display = "block";
+}
+}
+function toggle_search() {
+var w = document.getElementById("searchmenu");
+if( w.style.display=="block" ){
+w.style.display = "none";
+} else {
+w.style.display = "block";
+setTimeout(function(){
+document.getElementById("searchbox").focus()
+}, 30);
+}
+}
+function div_off(nm){document.getElementById(nm).style.display="none";}
+window.onbeforeunload = function(e){div_off("submenu");}
+/* Disable the Search feature if we are not operating from CGI, since */
+/* Search is accomplished using CGI and will not work without it. */
+if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){
+document.getElementById("search_menubutton").style.display = "none";
+}
+/* Used by the Hide/Show button beside syntax diagrams, to toggle the */
+function hideorshow(btn,obj){
+var x = document.getElementById(obj);
+var b = document.getElementById(btn);
+if( x.style.display!='none' ){
+x.style.display = 'none';
+b.innerHTML='show';
+}else{
+x.style.display = '';
+b.innerHTML='hide';
+}
+return false;
+}
+var antiRobot = 0;
+function antiRobotGo(){
+if( antiRobot!=3 ) return;
+antiRobot = 7;
+var j = document.getElementById("mtimelink");
+if(j && j.hasAttribute("data-href")) j.href=j.getAttribute("data-href");
+}
+function antiRobotDefense(){
+document.body.onmousedown=function(){
+antiRobot |= 2;
+antiRobotGo();
+document.body.onmousedown=null;
+}
+document.body.onmousemove=function(){
+antiRobot |= 2;
+antiRobotGo();
+document.body.onmousemove=null;
+}
+setTimeout(function(){
+antiRobot |= 1;
+antiRobotGo();
+}, 100)
+antiRobotGo();
+}
+antiRobotDefense();
+</script>
+
+
+
+<h1 align="center">The Default Page Size Change of SQLite 3.12.0</h1>
+
+<h2>1.0 Introduction</h2>
+
+<p>
+An SQLite database file consists of one or more "pages".
+For a single database file, all pages are the same size, though
+for different database files, the page size can any power of
+two between 512 and 65536, inclusive.
+</p>
+
+<p>
+Since the SQLite database file format was designed (in 2003) the
+default <a href="pragma.html#pragma_page_size">page size</a> for new databases has been 1024 bytes.  
+This was a reasonable choice in 2003.  But on modern hardware, 
+a 4096 byte page is a faster and better choice.
+So, beginning with SQLite <a href="releaselog/3_12_0.html">version 3.12.0</a> (2016-03-29)) the default 
+page size for new database files has been increased to 4096 bytes.
+</p>
+
+<p>
+The upper bound on the database <a href="pragma.html#pragma_cache_size">cache size</a> has 
+traditionally defaulted to 2000 pages.  SQLite <a href="releaselog/3_12_0.html">version 3.12.0</a> also
+changes this default setting to be "-2000" which means 2000*1024
+bytes, regardless of page size.  So, the upper bound on the amount
+of memory used for the page cache is unchanged.
+</p>
+
+<h2>2.0 <u>Not</u> a Compatibility Break</h2>
+
+<p>
+These changes in the default behavior of SQLite are not
+a compatibility break.  All legacy database files continue to be
+readable and writable by newer versions of SQLite, and all newly
+created database files continue to be readable and writable by
+legacy versions of the SQLite library.  The only thing that is changing
+is some default settings.  This should result in a performance
+increase for many applications.
+</p>
+
+<p>
+Though most application should not notice any change (except that
+they run a little faster), if problems arise then the
+legacy behavior can be restored at compile-time by using the
+following options to the C-compiler:
+
+<blockquote><pre>
+-DSQLITE_DEFAULT_PAGE_SIZE=1024 
+-DSQLITE_DEFAULT_CACHE_SIZE=2000
+</pre></blockquote>
+
+<p>
+The page size and cache size can also be set or changed at run-time using the
+<a href="pragma.html#pragma_page_size">page_size pragma</a> and <a href="pragma.html#pragma_cache_size">cache_size pragma</a>, respectively.
+
+<h2>3.0 Possible Negative Consequences Of This Change</h2>
+
+<p>
+The minimum size of an SQLite database is one page for each table and
+each index.  With a larger page size, the size of an empty database
+for a given schema will grow by a factor of four, therefore.  However,
+once the database begins to fill with content the size of the older
+1024-byte page databases and the newer 4096-byte page databases will
+quickly converge.  Due to relaxed bin-packing constraints, the 
+4096-byte page size might actually result in a smaller file, once
+substantial content is added.
+</p>
+<p align="center"><small><i>This page last modified on  <a href="https://sqlite.org/docsrc/honeypot" id="mtimelink"  data-href="https://sqlite.org/docsrc/finfo/pages/pgszchng2016.in?m=174c2a23e21a72342">2016-09-14 18:40:10</a> UTC </small></i></p>
+
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-05-05 17:28:19 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-05-05 17:28:19 +0000
commit	18657a960e125336f704ea058e25c27bd3900dcb (patch)
tree	17b438b680ed45a996d7b59951e6aa34023783f2 /www/pgszchng2016.html
parent	Initial commit. (diff)
download	sqlite3-18657a960e125336f704ea058e25c27bd3900dcb.tar.xz sqlite3-18657a960e125336f704ea058e25c27bd3900dcb.zip