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When we check the data changes again, we find the BadgeNumber column is still present but its value is NULL for the updated row . This is helpful because it means that applications that have been written to work with the existing interface will continue to work, as long as they can deal with the NULL value . To assist with this, SQL Server also keeps a history of the DDL changes, tracked by the trigger we saw earlier . You can see the history by executing the following command:

examples of their implementation in Java. Much of your XML-based systems integration work in the future will likely involve web services, so investing the time to master SOAP, UDDI, and WSDL should be well worth it. For another look at how web services are constructed and used in J2EE, you need only look to the case study in chapter 6. In that chapter, we combine our understanding of systems integration with the concepts from chapters 3 and 5 to create an end-to-end example of a J2EE/XML application that is integrated into its environment via web services.

EXEC sys.sp_cdc_get_ddl_history N'dbo_Employees';

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You will note from its output that it returns details of the DDL statements that were executed and allows you to map them to which LSN they relate to . The recommended approach for dealing with schema changes is to use a second capture instance . Applications would use the first instance until the new capture instance is created . Then they should find the lowest LSN from the new instance and request all changes less than that value from the first instance . They then stop using the old instance and switch to the next instance . After all clients stop using the old capture instance, it can be deleted, and another one can be created the next time a schema change occurs .

Given the default configuration of 5-second intervals at which up to 10 scans of up to 500 commands are processed, the theoretical limit for change data capture performance under the default would be 1,000 commands per second . These values can be changed . Each time a log scan is performed, a row is either written or updated to a structure exposed via a DMV . We can see what is happening with log scanning by executing the following command:

SELECT * FROM sys.dm_cdc_log_scan_sessions;

Demonstrates use of XSLT with Java servlets Compares pure J2EE user interface development with an XML approach Shows how to build multidevice and multilocale user interfaces Covers XML web publishing frameworks

This command provides a wealth of information about the process . A few columns are of particular interest, such as empty_scan_count, which returns the number of scans during which no changes of interest were located . An estimate of the throughput of the system could be obtained by dividing the command_count by the duration . Latency is a measure of how long it takes for change rows to be recorded in the change table after the transaction they relate to . Keeping tables and their related change tables on different filegroups is recommended .

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We have previously mentioned that to view data changes, a user must have SELECT permission on all columns that are part of the capture, and the user must be a member of the role (if any) specified when enabling change data capture at the table level . Enabling change data capture at the database level requires membership in the sysadmin fixed server role, not just database owner permissions . Enabling at the table level requires database owner permissions, not just table owner permissions . DDL operations on a table that is enabled for change data capture can only be performed by a member of the sysadmin fixed server role, the owner of the database, or a member of the db_ddladmin fixed database role . Users who would otherwise have permissions to perform those DDL operations (because they have been directly granted such permission) will receive error 22914 when they attempt to make DDL changes .

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