author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 11 Mar 2010 18:02:22 +0000 | |
changeset 3 | 46218c8b8afa |
parent 1 | 25a17d01db0c |
child 5 | f345bda72bc4 |
permissions | -rw-r--r-- |
3
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
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changeset
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<?xml version="1.0" encoding="utf-8"?> |
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
diff
changeset
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
diff
changeset
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3 |
<!-- This component and the accompanying materials are made available under the terms of the License |
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
diff
changeset
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"Eclipse Public License v1.0" which accompanies this distribution, |
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
diff
changeset
|
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
diff
changeset
|
6 |
<!-- Initial Contributors: |
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
diff
changeset
|
7 |
Nokia Corporation - initial contribution. |
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
diff
changeset
|
8 |
Contributors: |
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
diff
changeset
|
9 |
--> |
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
diff
changeset
|
10 |
<!DOCTYPE concept |
46218c8b8afa
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
1
diff
changeset
|
11 |
PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
1
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
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<concept xml:lang="en" id="GUID-84921F68-9449-564A-8527-203FA84AF2AF"><title>Database compression</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>A Store database can be compressed.</p> <p>Once compressed, a store database is read-only, but otherwise operates as normal and is opened in exactly the same way as an uncompressed database; data is dynamically decompressed as required.</p> <p>The memory required to decompress data as it is read depends on the length of the streams in the database store, but is typically just a few kilobytes. A compressed database is not noticably slower than the equivalent uncompressed database, especially on slower media, such as CF-card.</p> <p>The <codeph>RDbStoreDatabase</codeph> class provides the functions <codeph>CompressL()</codeph> and <codeph>DecompressL()</codeph> to convert a Store database to compressed form and vice-versa.</p> <p>Note that:</p> <ul><li id="GUID-0DD719CA-9073-5F03-8BB0-C71BE702E957"><p>encrypted databases cannot be compressed</p> </li> <li id="GUID-BE9AD15E-3B20-56CF-AFF4-4528457881C3"><p>index data is not compressed as the presence of indexes reduces the effective compression ratio</p> </li> <li id="GUID-D782E99C-AE1E-5158-9F5D-FD9ED94C6B29"><p>compression code on the emulator is more aggressive than that on ARM builds and can achieve better compression ratios; the resulting files are about 5% smaller at the expense of doing two or three times as much work</p> </li> <li id="GUID-7DA7C65C-C0CB-5C9E-810C-7318D7AC48EA"><p>compressing or decompressing a database can require a significant amount of memory.</p> </li> </ul> <p>When a file-store database is constructed using the <codeph>RDbNamedDatabase</codeph> interface, there is no access to the underlying store</p> </conbody></concept> |