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Each new version of SQL Server contains behavioral changes, some major, some minor. In any case, even small, subtle changes can significantly impact application behavior. Regardless of the upgrade technique, a crucial step in preparing for an upgrade to SQL Server 2008 is to analyze the upgrade target and determine whether any issues require attention. Together with the appropriate upgrade technique, such analysis is essential in minimizing unexpected issues, making the upgrade process as smooth as possible. SQL Server 2008, like 2005, includes an Upgrade Advisor tool, which you can use to examine existing 2000 and/or 2005 instances to determine whether any issues will prevent an upgrade from completing (blocking issues) or backward-compatibility issues that may lead to application failure after the upgrade. The Upgrade Advisor tool (which you access from the Planning menu of the SQL Server Installation Center as shown in figure 4.2) can be used to examine all SQL Server components, including Analysis Services, Reporting Services, Integration Services, and the core database engine itself. The Upgrade Advisor has two main components: an analysis wizard and a report viewer. Use the wizard to select an upgrade target (SQL Server components, instances, and databases) and begin the analysis. Once complete, the report viewer can be used to view the details of the analysis, as shown in figure 4.10. Like the 2005 version, the Upgrade Advisor tool can analyze trace files and Transact-SQL (T-SQL) scripts. You perform this analysis as a proactive measure to identify possible issues with application-generated data access code or T-SQL scripts, such as backup scripts used in scheduled maintenance plans.

Figure 4.10 The Upgrade Advisor wizard lets you inspect a SQL Server 2000 or 2005 instance before upgrading to detect issues requiring attention.

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Running the Upgrade Advisor produces a list of tasks that fall into two categories: those that must be completed before an upgrade can be performed, and those for attention once the upgrade is complete. Rather than list all of the possible postupgrade tasks, here are the recommended ones for the core database engine: Compatibility level check Post-upgrade, the compatibility level of the database is left at the pre-upgrade version. Although this is advantageous in minimizing the possibility of applications breaking due to the use of older language syntax that s no longer compatible with SQL Server 2008, some new functionality and performance optimizations won t be available until the new compatibility level is applied. Leaving an upgraded database at a previous compatibility level should be seen as an interim migration aid, with application code updated as soon as possible after installation. You can change the compatibility level of an upgraded database using the sp_dbcmptlevel stored procedure, or via the database properties in Management Studio, as shown in figure 4.11. Max Worker Threads If you re upgrading from SQL Server 2000, the Max Worker Threads setting, covered in chapter 7, is kept at the default value of 255. After the upgrade, change this value to 0, which allows SQL Server to determine the appropriate value based on the number and type of CPUs available to the instance. Statistics update Although SQL Server 2008 can work with statistics generated from earlier versions, I recommend you perform a full statistics update to take advantage of the query optimizer improvements in SQL Server 2008. 13 will discuss statistics in more detail.

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Figure 4.11 After you upgrade, the compatibility level of a database should be set to SQL Server 2008, once testing has confirmed the absence of any unexpected problems.

Configuration check Like 2005, SQL Server 2008 complies with the secure by default installation mode, whereby certain features are disabled upon installation. We ll cover these issues in chapter 6. Depending on the installation, certain required features may need to be manually enabled postinstallation. DBCC UPDATEUSAGE Databases upgraded from SQL Server 2000 may report incorrect results when using the sp_spaceused procedure. Running the UPDATEUSAGE command will update the catalog views used by this procedure, thus fixing this inaccuracy. Before looking at the upgrade methods, note that regardless of the method you choose, performing a test upgrade is crucial in identifying possible issues. Test upgrades provide an opportunity to Determine the length of the upgrade process, crucial in planning downtime for the real upgrade. Determine application behavior after the upgrade. This will allow you to set the database compatibility level to SQL Server 2008 and ensure applications work as expected. Performance-test applications on the upgraded database. If performance is poor, a test upgrade provides a chance of investigating the reasons prior to the production upgrade. Last but not least, complex upgrades involving components such as replication are certainly not something you want to be doing the first time in production! So, with these points in mind, let s take a look at the two upgrade methods, starting with the in-place method.

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