c# itextsharp datamatrix barcode CREATING INDEXES AND DATABASE DIAGRAMMING in Visual C#

Print Data Matrix 2d barcode in Visual C# CREATING INDEXES AND DATABASE DIAGRAMMING

CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
Data Matrix 2d Barcode Printer In Visual C#.NET
Using Barcode printer for .NET framework Control to generate, create ECC200 image in VS .NET applications.
www.OnBarcode.com
Read DataMatrix In C#.NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
This statement also holds true when a table has only a handful of records. Again, there is no reason to place an index on these tables. The reason for this is that SQL Server would go to the index, use its engine to make several reads of the data to find the correct record, and then move directly to that record using the record pointer from the index to retrieve the information. Several actions are involved in this process, as well as passing data between different components within SQL Server. When you execute a query, SQL Server will determine whether it s more efficient to use the indexes defined for the table to locate the necessary rows or to simply perform a table scan and look at every row within the table.
QR Creation In C#.NET
Using Barcode maker for .NET Control to generate, create QR image in .NET framework applications.
www.OnBarcode.com
Matrix Barcode Generator In C#
Using Barcode generator for .NET framework Control to generate, create Matrix 2D Barcode image in .NET applications.
www.OnBarcode.com
Reviewing Your Indexes for Performance
Encoding UCC-128 In Visual C#.NET
Using Barcode creator for .NET framework Control to generate, create GS1 128 image in VS .NET applications.
www.OnBarcode.com
EAN13 Generator In C#
Using Barcode generator for .NET framework Control to generate, create EAN-13 Supplement 5 image in .NET applications.
www.OnBarcode.com
Every so often, it s necessary for you as an administrator or a developer to review the indexes built on your table to ensure that yesterday s good index is not today s bad index. When a solution is built, what is perceived to be a good index in development may not be so good in production for example, the users may be performing one task more times than expected. Therefore, it is highly advisable that you set up tasks that constantly review your indexes and how they are performing. This can be completed within SQL Server via its index-tuning tool, the Database Tuning Advisor (DTA). The DTA looks at your database and a workload file holding a representative amount of information that will be processed, and uses the information it gleans from these to figure out what indexes to place within the database and where improvements can be made. At this point in the book, I haven t actually covered working with data, so going through the use of this tool will just lead to confusion. This powerful and advanced tool should be used only by experienced SQL Server 2005 developers or database administrators. Getting the indexes right is crucial to your SQL Server database running in an optimal fashion. Spend time thinking about the indexes, try to get them right, and then review them at regular intervals. Review clustering, uniqueness, and especially the columns contained within indexes so that you ensure the data is retrieved as fast as possible. Finally, also ensure that the order of the columns within the index will reduce the number of reads that SQL Server has to do to find the data. An index where the columns defined are FirstName, LastName, and Department might be better defined as Department, FirstName, and LastName if the greatest number of queries is based on finding someone within a specific department or listing employees of a department. The difference between these two indexes is that in the first, SQL Server would probably need to perform a table scan to find the relevant records. Compare that with the second example, where SQL Server would search the index until it found the right department, and then just continue to return rows from the index until the department changed. As you can see, the second involves much less work.
PDF417 Drawer In C#
Using Barcode generation for .NET Control to generate, create PDF417 image in .NET applications.
www.OnBarcode.com
Making USPS Confirm Service Barcode In Visual C#
Using Barcode maker for .NET framework Control to generate, create USPS Confirm Service Barcode image in .NET applications.
www.OnBarcode.com
Creating an Index
Encoding Data Matrix In Visual Basic .NET
Using Barcode printer for VS .NET Control to generate, create Data Matrix image in VS .NET applications.
www.OnBarcode.com
Painting Data Matrix ECC200 In Visual Studio .NET
Using Barcode generator for Reporting Service Control to generate, create Data Matrix 2d barcode image in Reporting Service applications.
www.OnBarcode.com
Now that you know what an index is and you have an understanding of the various types of indexes, let s proceed to create some in SQL Server. There are many different ways to create indexes within SQL Server, as you might expect. Those various methods are the focus of this section of the chapter, starting with how to use the table designer in SQL Server Management Studio. The first index we ll place into the database will be on the CustomerId field within the CustomerDetails.Customers table.
QR Maker In None
Using Barcode drawer for Software Control to generate, create QR Code image in Software applications.
www.OnBarcode.com
Barcode Reader In .NET Framework
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
1D Generator In VB.NET
Using Barcode creator for .NET framework Control to generate, create Linear 1D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Creating Data Matrix ECC200 In None
Using Barcode generation for Word Control to generate, create Data Matrix image in Word applications.
www.OnBarcode.com
EAN-13 Generator In None
Using Barcode printer for Software Control to generate, create EAN-13 image in Software applications.
www.OnBarcode.com
Encode Barcode In Objective-C
Using Barcode creator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Code-39 Recognizer In C#
Using Barcode decoder for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Print Barcode In .NET Framework
Using Barcode creator for .NET Control to generate, create Barcode image in .NET framework applications.
www.OnBarcode.com
DataMatrix Encoder In None
Using Barcode creation for Excel Control to generate, create DataMatrix image in Microsoft Excel applications.
www.OnBarcode.com
PDF-417 2d Barcode Drawer In None
Using Barcode maker for Software Control to generate, create PDF 417 image in Software applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.