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+<!DOCTYPE html>
+<html><head>
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+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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+<title>Change in Default Page Size in SQLite Version 3.12.0</title>
+<!-- path= -->
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+<body>
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+
+
+
+<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>
+