c# print 2d barcode Replication in C#.NET

Generation GS1 - 12 in C#.NET Replication

11
Encoding GTIN - 12 In Visual C#
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Reading UPCA In Visual C#
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Replication
Barcode Creator In Visual C#.NET
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Scan Bar Code In Visual C#.NET
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Lesson Review
Painting UPCA In .NET Framework
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UPC A Creator In Visual Studio .NET
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You can use the following questions to test your knowledge of the information in Les son 2, Transactional Replication. The questions are also available on the companion CD if you prefer to review them in electronic form.
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Code 39 Drawer In Visual C#
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NOTE
Printing QR Code 2d Barcode In C#.NET
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Draw Matrix 2D Barcode In C#.NET
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Answers
Draw Data Matrix In Visual C#
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Printing EAN-8 In Visual C#
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1D Printer In Visual Studio .NET
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Code 39 Extended Scanner In .NET
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1. A. Datum Corporation specializes in credit card processing services, and its sys tems need to maintain more than five 9s of availability. At the same time, the write volume exceeds the capacity of the current hardware as well as exceeding the projected capacity of new hardware that was proposed. Employees have determined that if the writes could be batched in some manner while read oper ations are offloaded to another server at the same time, the proposed new hard ware would provide enough capacity for the next two or three years. To achieve the necessary write capacity and redundancy, they need to deploy five servers that are geographically separated and two more servers that can be used as both a failover and a primary for read operations. What is the best choice of technol ogy to meet these business needs A. Database Mirroring B. Transactional replication in a central publisher configuration C. Transactional replication in a peer-to-peer configuration D. Transactional replication in a queued updating subscriber configuration
GTIN - 12 Encoder In Objective-C
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Creating Data Matrix In None
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Lesson 3: Merge Replication
QR Code JIS X 0510 Generator In None
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PDF 417 Encoder In None
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Lesson 3: Merge Replication
GTIN - 13 Generation In Objective-C
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Paint Barcode In Java
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Merge replication is another alternative that can be applied to high-availability sys tems. Merge replication was primarily designed for mobile, disconnected users. By translation, the mechanisms are already built in for changes to occur at any location and get synchronized, as well as being able to withstand failures and continue pro cessing. This lesson describes the internal mechanisms that are available for merge replication and how to apply merge replication to achieve greater availability of your systems.
After this lesson, you will be able to:
Design a high-availability solution that is based on replication.
Specify an appropriate replication solution. Establish a strategy for resolving data conflicts.
Estimated lesson time: 45 minutes
Change Tracking
The change-tracking process in merge replication is as follows: 1. The application issues a transaction. 2. The trigger behind the table is fired. 3. Insert or update is logged into MSmerge_contents while a delete is logged to MSmerge_tombstone. 4. The trigger commits. 5. The transaction commits. Unlike transactional replication, merge does not move copies of data into a distribution database. The logging that occurs within MSmerge_contents and MSmerge_tombstone indicates only that a change was made to a specific row. The actual data involved in the change is not copied; it resides only in the table. This creates an interesting effect. If 10 separate transactions were issued to the same row between cycles of the replica tion engine, and the table were configured with transactional replication, all 10 trans actions would be moved to the distribution database by the Log Reader Agent and then all 10 would subsequently be applied to the subscriber. The net effect is that nine transactions would be applied, only to be replaced by the tenth transaction against
11
Replication
that row. However, if the table were configured with merge replication, only the last
state of the row, the state after the tenth transaction, would be moved to the sub
scriber. This is accomplished by using the following process to synchronize changes:
1. The merge engine connects to the subscriber. 2. The merge engine connects to the publisher. 3. The merge engine interrogates the MSmerge_genhistory table on the subscriber to determine the list of generations that are not present on the publisher. 4. The merge engine then pulls the list of tables and rows contained in MSmerge_contents and MSmerge_tombstone for the generations that the pub lisher does not have. 5. The merge engine constructs delete statements from the rows extracted from MSmerge_tombstone. 6. The merge engine extracts the contents of the rows from the base tables in the database and packages the changes into batches. 7. The changes packaged are applied to the publisher. 8. Generations submitted to the publisher are logged into MSmerge_contents. 9. Conflicts are detected and resolved. 10. The merge engine interrogates the MSmerge_genhistory table on the publisher to determine the list of generations that are not present on the subscriber. 11. The merge engine then pulls the list of tables and rows contained in MSmerge_contents and MSmerge_tombstone for the generations that the sub scriber does not have. 12. The merge engine constructs delete statements from the rows extracted from MSmerge_tombstone. 13. The merge engine extracts the contents of the rows from the base tables in the database and packages the changes into batches. 14. The changes packaged are applied to the subscriber. 15. Generations submitted to the subscriber are logged into MSmerge_contents. A basic diagram of merge replication with the synchronization process is shown in Figure 11-9.
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