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The Segment Advisor runs automatically during the scheduled nightly maintenance and provides you with recommendations about objects you can shrink to reclaim wasted space. Just remember that you need to use locally managed tablespaces with Automatic Segment Space Management in order to use the Segment Advisor. Shrinking segments saves space, but more importantly, improves performance by lowering the high-water mark of the segments and eliminating the inevitable fragmentation that occurs over time in objects with heavy update and delete operations.

If the application doesn t reuse a table s data for a long period, the data might be aged out of the SGA and need to be read from disk. You can safely pin small tables in the buffer cache with the following: SQL> ALTER TABLE hr.employees CACHE; Table altered. SQL>

Events fired using procedure calls use a reference to the subscriber. Before firing a PC event, the sender must always check to see if the subscriber reference points to something; otherwise, a runtime error will occur. Since PC events are fired as indirect procedure calls, the subscriber reference will contain a reference either to a typed object or to a method. In both cases, the reference is usually initialized to zero or null, indicating no subscribers. When an object subscribes, a reference to it is saved in the event source. Firing events using procedure calls is conceptually similar across most languages, but each language imposes its own details at the implementation level.

SQL performance tuning tools are extremely important. Developers can use the tools to examine good execution strategies, and in a production database they re highly useful for reactive tuning. The tools can give you a good estimate of resource use by queries. The SQL tools are the EXPLAIN PLAN, Autotrace, SQL Trace, and TKPROF utilities.

The EXPLAIN PLAN facility helps you tune SQL by letting you see the execution plan selected by the Oracle optimizer for a SQL statement. During SQL tuning, you may have to rewrite your queries and experiment with optimizer hints. The EXPLAIN PLAN tool is great for this experimentation, as it immediately lets you know how the query will perform with each change in the code. Because the utility gives you the execution plan without executing the code, you save yourself from having to run untuned software to see whether the changes were beneficial or not. Understanding an EXPLAIN PLAN is critical to understanding query performance. It provides a window into the logic of the Oracle optimizer regarding its choice of execution plans. The output of the EXPLAIN PLAN tool goes into a table, usually called PLAN_TABLE, where it can be queried to determine the execution plan of statements. In addition, you can use GUI tools, such as OEM or TOAD, to get the execution plan for your SQL statements without any fuss. In OEM, you can view the explain statements from the Top Sessions or the Top SQL charts. A walkthrough of an EXPLAIN PLAN output takes you through the steps that would be undertaken by the CBO to execute the SQL statement. The EXPLAIN PLAN tool indicates clearly whether the optimizer is using an index, for example. It also tells you the order in which tables are being joined and helps you understand your query performance. More precisely, an EXPLAIN PLAN output shows the following: The tables used in the query and the order in which they re accessed. The operations performed on the output of each step of the plan. For example, these could be sorting and aggregation operations.

In C#, the preferred model for event firing is based on untyped-object calls Special constructs were added to the language to make the process simple The delegate keyword supports the definition of a reference-to-method type For example, to declare a reference to a universal method (which takes no parameters and returns no values), you would declare a delegate like this: delegate void UniversalMethod(); The word UniversalMethod is an arbitrarily chosen name for the new reference-to-universalmethod type The simplest Fire method for an untyped method call for an event named X would look something like the one shown in Listing 8-23 Listing 8-23 The C# Fire Method for Event X, Using Delegates public delegate void UniversalMethod(); public UniversalMethod OnX; void FireX() { if (OnX != null) OnX(); } The example uses a delegate variable called OnX to store a list of subscribers and invoke them.