create barcode using c# Part VII in Visual C#

Maker EAN / UCC - 13 in Visual C# Part VII

Part VII
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Performance Tuning and Troubleshooting
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Estimated CPU Cost
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The estimated cost of all CPU resources for this
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operation.
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Estimated Operator Cost The estimated cost of performing this operation (This cost is also represented as a percentage of the overall cost of the query. in parentheses.) Estimated Subtree Cost The estimated cost of performing this operation and all proceeding operations in its subtree. Estimated Number of Rows The estimated number of rows returned by this
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operation. Note
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Watch out for a large discrepancy between the estimated number of rows value and actual number of rows value.
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Estimated Row Size
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The estimated size of the Rovers, in bytes, retrieved by
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the operation.
Actual Rebinds/Actual Rewinds
The number of times the physical operator needed to initialise itself and set up any internal data structures. A rebind indicates that the input parameters changed and a re-evaluation was done. The rewind indicates that existing structures were used.
Ordered Whether the rows returned by this operation are ordered. Node ID
A unique identifier for the node. The database object that this operation accessed.
Object/Remote Object Output List
The list of outputs for this particular operation.
More Info For more information on the different types of logical operators that SQL Server's optimizer has available, search on the topic Graphical Execution Plan Icons (SQL Server Management Studio) in SQL Server 2005 Books Online. 3. SQL Server Managment Studio also has the capability to provide client statistics, which can also provide some important metrics when testing your T-SQL statements. It can also automatically average multiple executions of your T-SQL statement to get rid of any environmental anomalies and highlight whether there has been a decrease or an increase in the metrics returned. To view the client statistics,
30
Using Profiler, Management Studio, and Database Engine Tuning Advisor
click the Include Client Statistics button (which is located to the right of the Include Actual Execution Plan button), or press Shift+Alt+S. Figure 30-42 shows an example of two executions of the same T-SQL statement and the client statistics metrics returned. Note
The client statistics are not automatically reset for a given user connection in SQL Server Managment Studio. So if you change your T-SQL query, you should also reset the cllient statistics. This can be done by clicking on the Query menu and selecting the Reset Client Statistics option.
Figure 30-42 Client statistics.
Using SQL Server Profiler
As you have seen, you can use SQL Server Management Studio to analyse and fine tune T-SQL statements. However, it will not help you to find which queries are potentially inefficient in your database solution. If you are interested in identifying the different types of queries and T-SQL statements that are being executed by various client applications inside your particular environment, you will have to use a tool such as SQL Server Profiler.
Part VII
Performance Tuning and Troubleshooting
SQL Server Profiler is a very powerful utility that basically tries to capture the network activity between client applications and your SQL Server instance by listening in on the Tabular Data Stream (TDS). SQL Server Profiler can display this captured trace information in a very rich graphical environment, providing sorting and filtering capabilities that allow you to easily locate T-SQL statements of interest. It is particularly useful when working with third-party vendor applications over which you have no control, and you either want to learn more about how they work or perform-tune/troubleshoot them.
Capturing a SQL Server Profile Trace
To start SQL Server Profiler and capture a trace, follow these steps: 1. Click Start, All Programs, Microsoft SQL Server 2005, and Performance Tools and start SQL Server Profiler. When SQL Server Profiler first starts, it is blank because there are no traces running. The first thing you'll have to do is connect to your SQL Server instance. Click on the File menu and then New Trace (or press Ctrl-N) to connect to your SQL Server instance. Type your server name and authentication details, and then click the Connect button. 2. The Trace Properties Windows appears, as shown in Figure 30-43. To start profiling you need to create a new trace. Although you can create your own trace from scratch, the easiest way to create a trace is to use one of the predefined templates created by Microsoft. This saves time because you don't have to set up traces from scratch all the time. Don't forget that you can further customize what information these pre-defined traces gather or create templates specific to your particular requirements as required. SQL Server Profiler comes with the following predefined trace templates:
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