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+<div class=fancy>
+<div class=nosearch>
+<div class="fancy_title">
+Version Numbers in SQLite
+</div>
+</div>
+
+
+
+
+
+<h1 id="sqlite_version_numbers"><span>1. </span>SQLite Version Numbers</h1>
+
+<p>
+Beginning with <a href="releaselog/3_9_0.html">version 3.9.0</a> (2015-10-14) SQLite uses 
+<a href="http://semver.org">semantic versioning</a>.
+Prior to that time, SQLite employed a version identifier that
+contained between two and four numbers.
+
+</p><h2 id="the_new_version_numbering_system_after_dateof_3_9_0_"><span>1.1. </span>The New Version Numbering System (After 2015-10-14)</h2>
+
+<p>
+All SQLite releases starting with 3.9.0 use a three-number
+"<a href="http://semver.org">semantic version</a>" of the form X.Y.Z.
+The first number X is only increased when there is a change that
+breaks backward compatibility.  The
+current value for X is 3, and the SQLite developers plan to support
+the current SQLite database file format, SQL syntax, and C interface
+through <a href="lts.html">at least the year 2050</a>.  Hence, one
+can expect that all future versions of SQLite for the next several
+decades will begin with "3.".
+
+</p><p>
+The second number Y is incremented for any change that breaks forward
+compatibility by adding new features.
+Most future SQLite releases are expected
+to increment the second number Y.  The Z is reset to zero whenever Y
+is increased.
+
+</p><p>
+The third number Z is incremented for releases consisting of only
+small changes that implement performance enhancements and/or bug fixes.
+
+</p><p>
+The rate of enhancement for SQLite over the previous five years
+(2010-2015) is approximately 6 increments of Y per year.  The
+numbering format used by for <a href="c3ref/c_source_id.html">SQLITE_VERSION_NUMBER</a> and
+<a href="c3ref/libversion.html">sqlite3_libversion_number()</a> allows versions up to 3.999.999, which is
+more than enough for the planned end-of-support date for SQLite
+in 2050.  However, the current tarball naming conventions only
+reserve two digits for the Y and so the naming format for downloads
+will need to be revised in about 2030.
+
+</p><h2 id="the_historical_numbering_system_before_dateof_3_9_0_"><span>1.2. </span>The Historical Numbering System (Before 2015-10-14)</h2>
+
+<p>This historical version numbering system used a two-, three-,
+or four-number version:  W.X, W.X.Y, or W.X.Y.Z.
+W was the file format: 1 or 2 or 3.
+X was the major version.
+Y was the minor version.
+Z was used only for patch releases to fix bugs.
+
+</p><p>
+There have been three historical file formats for SQLite.
+SQLite 1.0 through 1.0.32 used the
+<a href="https://www.gnu.org/software/gdbm/gdbm.html">gdbm</a> library as its storage
+engine.
+SQLite 2.0.0 through 2.8.17 used a custom b-tree storage engine that
+supported only text keys and data.
+All modern versions of SQLite (3.0.0 to present) use a b-tree storage
+engine that has full support for binary data and Unicode.
+
+</p><p>
+This major version number X was historically incremented only for
+large and important changes to the code.  What constituted "large
+and important" was subjective.  The 3.6.23 to 3.7.0 change
+was a result of adding support for <a href="wal.html">WAL mode</a>.
+The 3.7.17 to 3.8.0 change was a result of rewrite known as the
+<a href="queryplanner-ng.html">next generation query planner</a>.
+
+</p><p>
+The minor version number Y was historically incremented for new
+features and/or new interfaces that did not significantly change
+the structure of the code.  The addition of <a href="lang_with.html">common table expressions</a>,
+<a href="partialindex.html">partial indexes</a>, and <a href="expridx.html">indexes on expressions</a> are all examples of
+"minor" changes.  Again, the distinction between "major" and "minor"
+is subjective.
+
+</p><p>
+The patch level Z was historically only used for bug-fix releases
+that changed only a small number of code lines.
+
+</p><h2 id="version_history"><span>1.3. </span>Version History</h2>
+
+<ul>
+<li><a href="chronology.html">Chronology</a>
+</li><li><a href="changes.html">Change log</a>
+</li></ul>
+<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/versionnumbers.in?m=d046ec30f9">2022-01-08 05:02:57</a> UTC </small></i></p>
+