--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-79B699F5-5EDE-5561-A385-19ED02248398.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept xml:lang="en" id="GUID-79B699F5-5EDE-5561-A385-19ED02248398"><title>Indexes</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>Indexes in the store database are B+tree structures with a fixed size key. This means that text keys may easily generate large indexes, and a maximum length text column cannot be indexed. </p> <p>Keys in DBMS may be truncated by specifying the length of a text column to be used in the index key. Such a key column must always be the last one in the key, to ensure that the index provides a true ordering. If a text key column does not supply a truncation length, the full length of the table column is used.</p> <p>Apart from <codeph>Binary</codeph> and <codeph>LongBinary</codeph> columns, all types can be used in an index key including <codeph>LongText8</codeph> and <codeph>LongText16</codeph>, although these must supply a truncation length (as they have no maximum length) and must therefore be the last key columns in the key.</p> </conbody></concept>
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