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Figure 8-4. Invoking methods of untyped event targets The use of calls to untyped targets make it possible for any public method of an object to be used potentially as an event handler, and the same method can be registered simultaneously as a handler for different events associated with different event source objects. Relatively recent languages, such as C# and Delphi Object Pascal, support method references at the language level. The Ada language doesn t natively support method references, but Garlan1 describes a technique to add support for untyped object calls to the language. Garlan uses the expression implicit invocations to refer to untyped object calls. C++ supports pointers to member functions, but restricts targets to be of a particular compile-time-defined class. Listing 8-7 shows an example: Listing 8-7. Untyped Object Calls in C++ // declare supporting items typedef void (MyClass::*EventXHandler)(); MyClass* eventXTarget; EventXHandler onEventX; // fire an event... if (eventXTarget && onEventX) (*eventXTarget.*onEventX)(); Using this C++ syntax, methods assigned to the variable onEventX must belong to MyClass. Attempts have also been made to support events in C++ in a more coherent way. ECO 2 is one example, based on new language constructs and classes. A precompiler converts the language constructs into C++ code.

PL/SQL procedure successfully completed. SQL> The example shown here disables the SQL Tuning Advisor task only during the MONDAY_ WINDOW but keeps the task enabled during all other windows.

The Autotask Background Process (ABP) is responsible for implementing the three automated maintenance tasks by converting the tasks into Scheduler jobs. For each automated task, ABP creates a task list and assigns a priority. The three priority levels are high, medium, and urgent. The Scheduler also creates job classes and maps a consumer group to the appropriate job class. The ABP assigns jobs to each of the job classes, and the job classes map the jobs to a consumer group based on the job priority level. The MMON background process spawns restarts and monitors the ABP process. The DBA_AUTOTASK view shows the tasks stored in the ABP repository, which is in the SYSAUX tablespace. You can view the ABP repository by querying the DBA_AUTOTASK_TASK view.

The default resource plan assigned to all maintenance windows is the DEFAULT_MAINTENANCE _ PLAN. When a maintenance window opens, the database actives the DEFAULT_MAINTENANCE_PLAN to control the CPU resources used by the automated maintenance tasks. The three automated maintenance tasks are run under the ORA$AUTOTASK_SUB_PLAN, a subplan for the DEFAULT_ MAINTENANCE_PLAN. You can change the resource allocation for automated tasks by changing the resource allocations for this subplan in the resource plan for a specific maintenance window.

1. David Garlan and Curtis Scott, Adding Implicit Invocation to Traditional Programming Languages (proceedings of the 15th International Conference on Software Engineering, Baltimore, MD, May 1993). 2. Mads Haahr, Rene Meier, Paddy Nixon, Vinny Cahill, and Eric Jul, Filtering and Scalability in the ECO Distributed Event Model (proceedings of the 5th International Symposium on Software Engineering for Parallel and Distributed Systems, Limerick, Ireland, June 2000).

Oracle Database 11g uses a built-in fault diagnosability infrastructure that helps you detect, diagnose, and resolve problems in your database. The fault diagnosability infrastructure focuses on trapping and resolving critical errors such as data corruption and database code bugs. The goal is to proactively detect problems and limit damage to the databases, while reducing the time it takes to diagnose and resolve problems. The fault diagnosability feature also contains elements that make it easier to interact with Oracle Support. Here are the key components of the new fault diagnosability infrastructure: Automatic Diagnostic Repository: This is a file-based repository for storing database diagnostic data. You can access the ADR through the command line or the Enterprise Manager. It includes trace files, alert logs, and health monitor reports, among other things. Each database instance has its own ADR home directory, but the directory structure is uniform across instances and products, thus enabling Oracle Support to correlate and analyze diagnostic data from multiple products and instances. Immediately after a problem occurs in the database, the diagnostic information is captured and stored within the ADR. You use this diagnostic data to send what are called incident packages to Oracle Support. The ADR Command Interpreter (ADRCI): This is a command-line tool to manage diagnostic information and create and manage incident reports. Health Monitor: This tool runs automatic diagnostic checks following database errors. You can also run manual health checks. The Support Workbench: This is an Enterprise Manager wizard that helps you diagnose critical errors and process and package diagnostic data for transmittal to Oracle Support and filing of technical assistance requests. Incident packaging service: This is a brand-new tool that enables you to easily create, edit, and modify incident information into physical packages for transmittal to Oracle Support for diagnosing purposes.