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Oracle Database 11g comes with several management advisors, which help tune your SQL queries, size your memory and undo configuration parameters, and figure out the right indexes and materialized views for your database. The advisors use a uniform interface the Advisor Central in the OEM, or the DBMS_ADVISOR package, when you invoke them manually. All the advisors use the Automatic Workload Repository as the source of their data and as a repository for their reports. 18 introduces the advisory framework in detail. Here s a brief description of the main management advisors, which you ll see in detail in later chapters.

The SQL Tuning Advisor provides recommendations for running SQL statements faster, by replacing manual tuning with tuning suggested by the Automatic Tuning Optimizer , which is the Cost-Based Optimizer in a tuning mode. The SQL Tuning Advisor calls the Automatic Tuning Optimizer to perform optimizer statistics analysis, SQL profiling, access-path analysis, and SQL structure analysis. I discuss the SQL Tuning Advisor in 19.

3. James Westland Cain and Rachel Jane McCrindle, An Investigation into the Effects of Code Coupling on Team Dynamics and Productivity (proceedings of the IEEE 26th Annual International Computer Software and Applications Conference, Oxford, England, August 26 29, 2002).

The SQL Access Advisor provides advice on materialized views, indexes, and materialized view logs, in order to design the most appropriate access structures to optimize SQL queries. 7 shows you how to use the SQL Access Advisor.

Often, table segments become fragmented over time. The Segment Advisor checks database object space usage and helps you regain excess space in segments by performing segment-shrinking operations. The Segment Advisor also helps in predicting the size of new tables and indexes and analyzing database-object growth trends. 17 shows you how to use the Segment Advisor.

languages, these activities occur at run time, so there is no real distinction between build time and run time.

When you re making system changes such as upgrading your database to a new release or modifying the server configuration, you ideally would test and validate before making the changes in the production system. The difficulty, however, lies in the fact that it s not easy to simulate the production

system on a test system, thus introducing a serious element of uncertainly when undertaking major system changes. Oracle Database 11g has introduced two key features, called Database Replay and SQL Performance Analyzer, to help you manage change confidently. I briefly review these two interesting features in the following sections. 20 contains a detailed discussion of these two change management features.

Database Replay lets you test the impact of system changes by replaying and testing a production workload on a test system first. You first capture the production workload of the production database over a representative period of time such as a peak period. You then move this captured data over to a test system and replay the workload on that system, which you configure in an identical fashion to the production system. The replay of the production workload on the test system shows you the errors, data and performance divergence, and other statistics that help you determine whether you can safely make the change on the production system.