generate barcode in vb.net Lesson 2: Transactional Replication in Visual C#.NET

Creation UPCA in Visual C#.NET Lesson 2: Transactional Replication

Lesson 2: Transactional Replication
UCC - 12 Drawer In C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create UPC Symbol image in VS .NET applications.
www.OnBarcode.com
UPC-A Supplement 5 Recognizer In Visual C#.NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
A tracer token is a specialized transaction issued for the replication engine. It is sent to the transaction log like any other transaction. The replication agents move the tracer token through the architecture like any other transaction. What makes a tracer token special is that the replication engine recognizes the special transaction and logs tim ing statistics as it moves through the architecture. With a tracer token, you can get exact timings of how long it took to move the token to the distribution database and how long it took to be sent to each subscriber. You can also get an aggregate of the overall latency from a publisher to each subscriber. With this information, it is now possible for you to isolate and fix any bottlenecks within the replication architecture.
Barcode Creator In Visual C#
Using Barcode drawer for VS .NET Control to generate, create barcode image in VS .NET applications.
www.OnBarcode.com
Barcode Decoder In C#
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Validation
UPC Code Generation In .NET
Using Barcode drawer for ASP.NET Control to generate, create UPC Code image in ASP.NET applications.
www.OnBarcode.com
Generating GS1 - 12 In .NET Framework
Using Barcode creator for .NET framework Control to generate, create GTIN - 12 image in .NET applications.
www.OnBarcode.com
The replication engine guarantees that transactions move from publisher to sub scriber in the same order as they were originally committed. Because the publisher and subscriber are normally databases on different instances of SQL Server that can be geographically separated, the question always remains this: How do you know that the two databases are synchronized The replication engine provides a mechanism to validate the synchronization. Two sys tem stored procedures are provided to perform the validation: sp_publication_validation and sp_article_validation. The sp_publication_validation system stored procedure simply executes sp_article_validation for all articles within a publication. Each of these procedures can perform a validation using two different methods:
Creating UPC-A Supplement 5 In Visual Basic .NET
Using Barcode printer for Visual Studio .NET Control to generate, create UPC A image in Visual Studio .NET applications.
www.OnBarcode.com
1D Barcode Drawer In Visual C#
Using Barcode maker for VS .NET Control to generate, create 1D Barcode image in .NET framework applications.
www.OnBarcode.com
Rowcount only Rowcount and binary checksum
Barcode Printer In Visual C#.NET
Using Barcode creation for .NET Control to generate, create barcode image in .NET applications.
www.OnBarcode.com
Encoding ANSI/AIM Code 39 In C#.NET
Using Barcode encoder for .NET Control to generate, create Code39 image in Visual Studio .NET applications.
www.OnBarcode.com
The default validation mode is to perform a rowcount only. This method only checks to ensure that the number of rows is the same between the publisher and the sub scriber. The content of the rows could be completely different; it would not be detected with this validation method. However, because the databases are participat ing in replication, it is extremely unlikely that tables with the same rowcount would not also contain the same data. The most extensive validation is to perform a rowcount and binary checksum. The row count of each table is compared between publisher and subscriber. Additionally, a binary checksum is calculated and compared. This validation method detects any differences in the number of rows as well as the content of the rows. However, it is an
Matrix Barcode Printer In Visual C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create Matrix 2D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Draw Code 2 Of 5 In Visual C#.NET
Using Barcode creator for .NET Control to generate, create Code 2 of 5 image in .NET applications.
www.OnBarcode.com
11
Generating GTIN - 13 In Objective-C
Using Barcode maker for iPhone Control to generate, create EAN-13 Supplement 5 image in iPhone applications.
www.OnBarcode.com
Encoding UPC-A Supplement 2 In Visual Basic .NET
Using Barcode creation for Visual Studio .NET Control to generate, create GS1 - 12 image in Visual Studio .NET applications.
www.OnBarcode.com
Replication
Encode Code-39 In Java
Using Barcode generation for Android Control to generate, create USS Code 39 image in Android applications.
www.OnBarcode.com
Bar Code Generation In .NET
Using Barcode printer for .NET Control to generate, create bar code image in Visual Studio .NET applications.
www.OnBarcode.com
expensive operation that causes processing overhead. Because of the amount of over head required, you should execute this type of validation only on an infrequent basis.
Read QR Code ISO/IEC18004 In Visual Basic .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Creating GS1 128 In Java
Using Barcode encoder for BIRT Control to generate, create EAN / UCC - 13 image in Eclipse BIRT applications.
www.OnBarcode.com
BEST PRACTICES
Bar Code Recognizer In VS .NET
Using Barcode decoder for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Encoder In .NET
Using Barcode creation for Reporting Service Control to generate, create barcode image in Reporting Service applications.
www.OnBarcode.com
Validating articles
Validation can cause a lot of overhead, particularly in environments with large numbers of subscrib ers to a single publication or with publications that contain a large number of articles. It is most common to perform a rowcount-only validation on a daily basis while reserving the rowcount and binary checksum validation for a weekly execution.
Quick Check
1. Name two options for transactional replication. 2. Name two architectures for transactional replication. 3. What is the special transaction now available for transactional replication that provides timing statistics 4. What are the two procedures that are used to validate whether a publisher and subscriber are synchronized
Quick Check Answers
1. Immediate Updating Subscriber and Queued Updating Subscriber 2. Peer-to-peer and bidirectional 3. Tracer tokens 4. sp_publication_validation and sp_article_validation
Practice: Implementing Transactional Replication
In this exercise, you configure transactional replication using the AWTransactional database.
Exercise 1: Creating the Publication
In this exercise, you will create a publication. 1. Open SSMS and connect to the instance that you will be using for replication. 2. Create a database named AWTranSubscriber on the same instance as the AWTrans actional database.
Lesson 2: Transactional Replication
3. If necessary, expand Replication. Right-click Local Publications, and choose New Publication. Click Next. 4. Select the AWTransactional database, and click Next. 5. Select Transactional Publication, and click Next. 6. Select all tables and all user-defined functions (UDFs), as shown in Figure 11-8, and click Next.
Figure 11-8 Selecting articles
NOTE
UDFs
You include the UDFs within the publication because there are tables within the AdventureWorks database that have constraints defined with a UDF. If they are not either created already on the subscriber or added to the publication, a failure occurs when the snapshot is applied.
7. You will not be applying any filters. Click Next. 8. Select the Create A Snapshot Immediately And Keep The Snapshot Available To Initialize Subscribers check box, and click Next. 9. Click Security Settings. 10. Select the option for Run Under The SQL Server Agent Service Account, along with the option for By Impersonating The Process Account, and click OK.
Copyright © OnBarcode.com . All rights reserved.