asp net c# barcode generator Dealing with I/O in C#.NET

Encoding QR in C#.NET Dealing with I/O

Dealing with I/O
QR Code JIS X 0510 Encoder In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create QR Code image in .NET framework applications.
www.OnBarcode.com
Decoding Denso QR Bar Code In Visual C#.NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Even though the type and volume of email had changed dramatically since Microsoft first laid out Exchange s database schema in 1996, Exchange Server 2000, 2003, and 2007 use the same schema that emphasizes efficient storage over utility. Cheaper storage makes it less attractive to focus on storage efficiency. To achieve a reduction in I/O, the Store had to move away from forcing disks to do many small random I/Os to fetch data, instead using larger sequential I/Os. The physical performance difference between random and sequential I/O almost guarantees better performance and lower I/O activity for any application if the code is written to move away from random I/O. To make the change, Exchange 2010 introduces a new schema (discussed in the section A new database schema later in this chapter) that generates fewer I/Os by emphasizing contiguity over storage, essentially by keeping mailbox content together. Because more data are contiguous, the Store can read data out in large sequential chunks rather than in many random and smaller chunks. A side effect of the new Exchange 2010 schema is that the concept of single-instance storage is consigned to Exchange s wastebasket. You might assume that Exchange 2010 databases will grow larger because mailboxes hold their own copies of messages. In fact, this isn t true because of other changes in the Exchange 2010 Store, such as the way that it compresses message content. However, a side effect of the elimination of single-instance storage is that more transaction logs are generated to capture the insertion of individual copies of items into the table for each mailbox. For example, if you send a message with a 1 MB attachment to 10 mailboxes in the same database, the Store has to create at least 10 transaction logs.
Bar Code Creator In C#.NET
Using Barcode generation for .NET Control to generate, create barcode image in .NET framework applications.
www.OnBarcode.com
Decode Bar Code In C#
Using Barcode reader for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Dealing with I/O
Generating Quick Response Code In .NET
Using Barcode drawer for ASP.NET Control to generate, create Denso QR Bar Code image in ASP.NET applications.
www.OnBarcode.com
Creating QR Code In Visual Studio .NET
Using Barcode maker for .NET framework Control to generate, create QR image in Visual Studio .NET applications.
www.OnBarcode.com
Large mailboxes tend to have many views, and those views are usually for the default folders (Inbox, Sent Items, and Deleted Items). Many people don t like the work involved in filing email into different folders and are happy to let messages build up in the default folders, only taking action when prompted to by quota exhaustion. Human behavior results in folders that hold many thousands of items, and in earlier versions of Exchange, the Store generated more I/O when it had to access large folders. This prompted Microsoft to recommend that the largest folder should hold fewer than 5,000 items in Exchange 2007. The combination of superior OST performance delivered from Outlook 2007 SP2 onward coupled with the improvements delivered by the enhancements made to the Exchange 2010 Store means that Microsoft s new recommendation for the maximum number of items in a folder is now 20,000. Nontechnical users were seldom aware of any limitation and carried on using the Inbox as a convenient dumping ground for messages. Better search technology within Outlook compounded the problem because there was now no penalty for messy or nonexistent filing, and you could find any item you needed quickly, even within a cluttered Inbox. The combination of an inefficient schema and the way the Store created views caused many I/O operations. I/Os are random because the pages that represent the contents of a mailbox were usually not contiguous within the database. This factor and the 8 KB page size resulted in many small I/Os whenever a client requested data. For competitive reasons, Microsoft wanted to efficiently support very large mailboxes in Exchange 2010. The tweaking that they had done in Exchange 2007 had helped a bit, but a more fundamental overhaul was necessary.
QR Encoder In Visual Basic .NET
Using Barcode printer for .NET framework Control to generate, create Quick Response Code image in .NET framework applications.
www.OnBarcode.com
Paint GS1 - 13 In Visual C#
Using Barcode creation for .NET framework Control to generate, create EAN 13 image in VS .NET applications.
www.OnBarcode.com
How Exchange 2010 supports large mailboxes
Generating PDF417 In Visual C#
Using Barcode encoder for .NET framework Control to generate, create PDF-417 2d barcode image in .NET framework applications.
www.OnBarcode.com
Drawing 2D Barcode In Visual C#
Using Barcode drawer for Visual Studio .NET Control to generate, create Matrix 2D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Introduces a new Store schema that is designed to deal with large mailboxes
Making Bar Code In Visual C#
Using Barcode printer for .NET framework Control to generate, create bar code image in .NET applications.
www.OnBarcode.com
Code 93 Extended Creator In Visual C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create ANSI/AIM Code 93 image in VS .NET applications.
www.OnBarcode.com
more efficiently .
UPC Code Generation In Java
Using Barcode generator for Android Control to generate, create GTIN - 12 image in Android applications.
www.OnBarcode.com
Bar Code Maker In None
Using Barcode generator for Word Control to generate, create barcode image in Microsoft Word applications.
www.OnBarcode.com
Forces pages within the Store to be laid out contiguously rather than having
Paint UCC-128 In None
Using Barcode maker for Software Control to generate, create EAN / UCC - 14 image in Software applications.
www.OnBarcode.com
Creating Barcode In Java
Using Barcode generation for Android Control to generate, create bar code image in Android applications.
www.OnBarcode.com
pages scattered around the database .
Recognize Code39 In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Generate Code 128 Code Set C In None
Using Barcode creator for Word Control to generate, create Code 128 Code Set A image in Office Word applications.
www.OnBarcode.com
Expands the default page size from 8 KB to 32 KB and ensures that the Store
Generate PDF417 In Java
Using Barcode encoder for BIRT Control to generate, create PDF-417 2d barcode image in BIRT reports applications.
www.OnBarcode.com
UPC A Generation In Java
Using Barcode generation for Java Control to generate, create UPC Code image in Java applications.
www.OnBarcode.com
allocates pages in large contiguous chunks rather than randomly within the database .
7
Views (or secondary indexes) are a very valuable user feature. Outlook allows users to sort items within folders using a wide variety of properties (author, date received, subject, and so on). Every time a user opts for a different sort order, the Store creates a new view. Thereafter, as new items arrive into the Store, a lot of work occurs to update the views. Eventually, if a view is not used, it expires and is removed by the Store.
Copyright © OnBarcode.com . All rights reserved.