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A computer network that spans a relatively small area. Most LANs are confined to a single building or group of buildings. However, one LAN can be connected to other LANs over any distance through telephone lines and radio waves. A video mode that projects an exact copy of the content of your mobile PC screen onto a projector screen or other external display.

When the net version is selected, only the net effect of the transactions is returned In our case, an insert of Brian Burke followed by a change of the same row to Terry Earls has the net effect of just inserting Terry Earls The net functions will return a single row for each data value changed, no matter how many times they change Supporting net changes requires an additional index to be built over the change table, so it adds some level of performance overhead For our Employee dimension ETL scenario we need to capture every change to the data so we will need to use the all versions, but many other applications will be happy to receive only the net effect of a series of changes To make it easier to select the appropriate LSNs, SQL Server provides us with functions to map times to and from LSNs .

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It does this by querying the cdclsn_time_mapping table mentioned earlier We can create a stored procedure to return all changes since a specified time with a command such as the following:.

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CREATE PROCEDURE dbo.Get_Employee_Data_Changes @FromTime datetime, @LastTime datetime OUTPUT AS DECLARE @From_LSN binary(10); SET @From_LSN = sys.fn_cdc_map_time_to_lsn( 'smallest greater than or equal', @FromTime); DECLARE @To_LSN binary(10); SET @To_LSN = sys.fn_cdc_get_max_lsn();

Summary

SET @LastTime = sys.fn_cdc_map_lsn_to_time(@To_LSN); SELECT * FROM cdc.fn_cdc_get_all_changes_dbo_Employees (@From_LSN,@To_LSN,'all'); GO

We could then retrieve all the changes in the past day like this:

DECLARE @FromTime datetime = DATEADD(DAY,-1,SYSDATETIME()); DECLARE @LastTime datetime; EXEC dbo.Get_Employee_Data_Changes @FromTime, @LastTime OUTPUT;

This chapter began by describing systems integration, the process of gluing individual applications and services together to create robust distributed systems. We discussed the four general architectural patterns for integrating independent systems. These patterns describe the four ways in which two systems communicate: through data, messages, remote procedures, and object interfaces. After discussing general integration patterns, we examined a proven approach to systems integration called constraint-based modeling. After understanding the systems integration process, the remainder of the chapter focused on the ways in which XML technologies can make integration easier and more robust. We outlined the current XML standards and technologies that can be implemented in each of the four architectural patterns, including some of the key Java/J2EE APIs that implement them. Sections 4.2 and 4.3 focused on SOAP and web services. These sections included brief introductions to the technologies in general, along with

We could build a similar procedure that took an LSN instead of a time . Our ETL process would need to remember either the latest LSN or the latest time until which it received changes and simply request everything since that value the next time . We have now completed the basic data feed requirements of our scenario .

Although it s easy to get started, you need to consider number of management issues when working with change data capture .

First, you might wonder what happens if you change the structure of your table . Execute the following code to add a column:

Summary

If you retrieve the set of changes again, you ll find that even though every row was modified by adding a default value to this new column, no additional change records are generated . New columns are ignored . We can delete a column by executing the following code:

A generic term for any computer that has its own battery and can be carried around, including notebooks, laptops, and Tablet PCs. A device that enables digital data transmission to be transmitted over telecommunications lines.

The command succeeds but if we again retrieve the change records, we notice the BadgeNumber column is still returned and contains values . Let s generate a new data modification by executing the following command:

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