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+<!-- keywords: snapshot sqlite3_snapshot -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Database Snapshot</h2>
+</div>
+<blockquote><pre>
+typedef struct sqlite3_snapshot {
+  unsigned char hidden[48];
+} sqlite3_snapshot;
+</pre></blockquote>
+<p>
+An instance of the snapshot object records the state of a <a href="../wal.html">WAL mode</a>
+database for some specific point in history.</p>
+
+<p>In <a href="../wal.html">WAL mode</a>, multiple <a href="../c3ref/sqlite3.html">database connections</a> that are open on the
+same database file can each be reading a different historical version
+of the database file.  When a <a href="../c3ref/sqlite3.html">database connection</a> begins a read
+transaction, that connection sees an unchanging copy of the database
+as it existed for the point in time when the transaction first started.
+Subsequent changes to the database from other connections are not seen
+by the reader until a new read transaction is started.</p>
+
+<p>The sqlite3_snapshot object records state information about an historical
+version of the database file so that it is possible to later open a new read
+transaction that sees that historical version of the database rather than
+the most recent version.
+</p><p>1 Constructor using this object: <a href="../c3ref/snapshot_get.html">sqlite3_snapshot_get()</a></p>
+<p>1 Destructor using this object: <a href="../c3ref/snapshot_free.html">sqlite3_snapshot_free()</a></p>
+<p>3 Methods using this object:
+ <a href="../c3ref/snapshot_cmp.html">sqlite3_snapshot_cmp()</a>,
+<a href="../c3ref/snapshot_open.html">sqlite3_snapshot_open()</a>,
+<a href="../c3ref/snapshot_recover.html">sqlite3_snapshot_recover()</a></p>
+<p>See also lists of
+  <a href="../c3ref/objlist.html">Objects</a>,
+  <a href="../c3ref/constlist.html">Constants</a>, and
+  <a href="../c3ref/funclist.html">Functions</a>.</p>
+