Symbian3/PDK/Source/GUID-4EE4E79E-F6D5-5F14-BA8D-4DD10D229B74.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 16 Jul 2010 17:23:46 +0100
changeset 12 80ef3a206772
parent 9 59758314f811
child 14 578be2adaf3e
permissions -rw-r--r--
Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-4EE4E79E-F6D5-5F14-BA8D-4DD10D229B74" xml:lang="en"><title>Handling BLOBs</title><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>This document introduces you to Binary Large Objects (BLOB) in
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Symbian SQL. </p>
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<section id="GUID-EAAD8374-EFB5-496A-993E-84D310F7CDFE"><title>Purpose</title> <p>A BLOB is an SQL database container
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object for binary large objects, usually images or audio files but
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may also include other binary files such as an application executable. </p> </section>
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<section id="GUID-A53CDAF5-D5A4-4230-90DA-9F942F26CED3"><title>Features of SQL BLOB</title> <p>BLOBS offer the following
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features: </p> <ul>
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<li id="GUID-50CE608F-04BA-5D0F-BA59-E608F4B10989"><p>read from and
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write to BLOB objects in a RAM-efficient manner -- enables an overall
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reduction of RAM usage, </p> </li>
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<li id="GUID-60702664-4ABF-5F90-9DDE-C77969C0DC0B"><p>reduced read
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latency (compared to previous versions) -- improving the responsiveness
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of client applications, </p> </li>
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<li id="GUID-72DAFF78-CF0D-50F0-8C29-BF95920D2CA0"><p>larger BLOB
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objects can be stored and retrieved (&gt;16Mb). Before version 9.5 there
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was a limit on the size of a BLOB object supported by Symbian SQL.
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This limit was dictated by the amount of server-side RAM available.
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Applications that needed to store large BLOB objects in their database
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(for example, MP3 files) are no longer restricted by this limit. </p> </li>
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<li id="GUID-D66B611B-8908-59B1-A7BA-BED5D6702509"><p>The maximum
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possible length for a blob is 2147483647 bytes. </p> </li>
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</ul> </section>
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<section id="GUID-E2F1B6E4-D146-4467-AE17-169C55579012"><title>Streaming</title> <p>The classes <xref href="GUID-03426E55-3C0A-322B-9CE7-556D63FD762F.dita"><apiname>RSqlBlobReadStream</apiname></xref> and <xref href="GUID-9D7747B6-E090-3450-9906-845B549F966F.dita"><apiname>RSqlBlobWriteStream</apiname></xref> allow direct access to
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BLOB content. These classes do not require the whole BLOB to be loaded
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into RAM before streaming can begin. These classes match the standard
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Symbian <xref href="GUID-81056EAD-722C-373F-A8CF-4CC67A5B4468.dita"><apiname>RReadStream</apiname></xref> /<xref href="GUID-ADAC48A2-3D24-306B-9473-70201F4D351D.dita"><apiname>RWriteStream</apiname></xref> idiom. </p> <p>The server intelligently chooses the size of an internal
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buffer to incrementally read/write the requested blob data in blocks.
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The size of the buffer is calculated based on a combination of the
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size of the request and the value of <codeph>aBlockSizeHint</codeph> (if specified). </p> <p> <codeph>aBlockSizeHint</codeph> is provided
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by the client to provide a hint to the server about the size of block
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that it is intending to use to read/write the blob data. This is advance
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information about the intended behaviour of the client that the server
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may use to its benefit to read/write the blob data. </p> </section>
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<section id="GUID-1DBAF5CA-1FD4-4D94-BD28-B00E8049C7DC"><title>Whole-blob access</title> <p>The class <xref href="GUID-78544D11-1972-3492-9BD7-D794240895E1.dita"><apiname>TSqlBlob</apiname></xref> allows one-shot storage and retrieval of whole blobs. This class
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avoids the need for double buffering of the blob in both the client
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and the server. </p> <p>there are two versions of the BLOB get functions.
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One is <i>non-leaving</i> and the other is <i>leaving</i>. </p> <p>Use the non-leaving variant when the client knows that the blob will
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either: </p> <ul>
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<li id="GUID-557D1A55-1E94-56F6-8794-1257ED5D2E17"><p>all be of a
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fixed size, </p> </li>
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<li id="GUID-7C5CA733-C030-5761-A2C0-5EAA7A3B50FD"><p>not exceed an
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upper size limit. </p> </li>
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</ul> <p>In these situations the client can pre-allocate a buffer
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and avoid the overhead of memory allocation. </p> <p>Use the leaving
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variant when the client does not have prior knowledge of the BLOB
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size (or if the size varies wildly). In this situation the server
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allocates a buffer and passes ownership to the client. </p> </section>
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<section id="GUID-DEA6CB21-B0E7-4CCD-A0FD-44C979352009"><title>RAM benefits</title> <p>Symbian SQL has been improved
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to eliminate the need for a 2 MB server-side buffer. Data is transferred
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to the client in blocks so for example, the server-side buffer may
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be reduced to 32 KB. </p> <p>Previous to version 9.5, both whole-blob
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and streaming use cases require up to 3MB of server-side RAM. The
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page cache size is capped at 1MB due to a built-in limiting mechanism.
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But, a 2MB buffer must be allocated to hold the entire blob. A critical
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side-effect of this is that, due to heap exhaustion, there is a maximum
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limit on the size of a blob object that can be written to or read
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from a database. </p> <p>In the following diagram the top two sections
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illustrate whole-blob retrieval in which the entire blob is retrieved
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in one go using <xref href="GUID-0176BF07-DF94-3259-8F90-DE030E35CE9A.dita"><apiname>RSqlStatement</apiname></xref>. The bottom section
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illustrates streaming retrieval in which the blob is retrieved in
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blocks specified by the client using <xref href="GUID-35BF7B4A-C4F7-3215-B5DF-6D0682247976.dita"><apiname>RSqlColumnReadStream</apiname></xref>. </p> <fig id="GUID-60AEFF09-235C-55F3-BBEF-D484964A4A82">
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<title>              Reading a 2MB blob.            </title>
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<image href="GUID-739556F5-A2F3-5548-943C-7D50785DFB48_d0e636585_href.png" placement="inline"/>
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</fig> </section>
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</conbody><related-links>
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<link href="GUID-5C3005B3-7008-5209-A2BD-D52B8B422D58.dita"><linktext>SQL
80ef3a206772 Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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Security  Policies</linktext></link>
80ef3a206772 Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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<link href="GUID-CB33868A-139C-5976-B021-709E663FA21B.dita"><linktext>Database
80ef3a206772 Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 9
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file  format</linktext></link>
80ef3a206772 Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 9
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<link href="GUID-DA1D327C-141C-524A-AD57-5E246745808D.dita"><linktext>SQLite
80ef3a206772 Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 9
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 Modules</linktext></link>
80ef3a206772 Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 9
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<link href="GUID-A64625D4-F101-5DB7-896B-F91A21BABE01.dita"><linktext> Reclaiming
80ef3a206772 Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 9
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Free Space </linktext></link>
80ef3a206772 Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 9
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<link href="GUID-22844C28-AB5B-5A6F-8863-7269464684B4.dita"><linktext>SQL
80ef3a206772 Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 9
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Overview</linktext></link>
80ef3a206772 Week 28 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 1897, Bug 344, Bug 2681, Bug 463, Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents: 9
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</related-links></concept>