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The application was performing functionality (the queue table) that the database already supplied in a highly concurrent and scalable fashion I m referring to the Advanced Queuing (AQ) software that is burned into the database, functionality they were trying to reinvent The developers had no idea what the beans did in the database or where to look for potential problems That was hardly the end of the problems on this project We then had to figure out How to tune SQL without changing the SQL Oracle 10g actually does permit us to accomplish this magical feat for the first time to a large degree How to measure performance How to see where the bottlenecks are How and what to index And so on.

The CHECK_EXTERNAL function checks for any external tables, directories, or BFILEs in the database. Here s an example: SQL> SET SERVEROUTPUT ON SQL> DECLARE external BOOLEAN; BEGIN external := DBMS_TDB.CHECK_EXTERNAL; END; / The following directories exist in the database: SYS.DATA_PUMP_DIR, SYS.ADMIN_DIR, SYS.WORK_DIR PL/SQL procedure successfully completed. SQL>

Workers are the objects or components that implement the business logic of a system. To use a human metaphor, workers represent the skilled labor of a system. If software systems were implemented in hardware, workers would be the custom chips that do all the business-specific or application-specific work, delivering the most valuable services. Virtually no useful software system can be built without workers, because such a system would contain no business logic. Workers are also known in the literature as business components.2

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DBMS_JOB is one of the most widely used Oracle-supplied packages. You can use the package to schedule and maintain automated user jobs from within the Oracle database. Many times, you ll need to schedule a program to run on a regular basis, and the DBMS_JOB package lets you do this without recourse to the operating system utilities. With the introduction of the Oracle Scheduler feature, the DBMS_JOB package becomes a secondary way to schedule jobs in your database. The Oracle Scheduler feature is much more powerful than the job system you can create with the DBMS_JOB package, and offers you many more capabilities. I discuss the DBMS_SCHEDULER package, which supports the Oracle Scheduler, later in this chapter, in the section titled DBMS_SCHEDULER.

At the end of the week, the developers, who had been insulated from the database, were amazed at what the database could actually provide for them, how easy it was to get that information and, most important, how big a difference it could make to the performance of their application In the end they were successful just behind schedule by a couple of weeks This example is not meant to be a criticism of tools or technologies like EJBs and container-managed persistence Rather, it is a criticism of purposely remaining ignorant of the database, how it works, and how to use it The technologies used in this case worked well after the developers gained some insight into the database itself The bottom line is that the database is typically the cornerstone of your application If it does not work well, nothing else really matters.

You use various procedures in the DBMS_JOB package to create and schedule jobs. The SUBMIT procedure, which lets you submit a new job, has several parameters, which I explain in more detail in the following section. These parameters are as follows: JOB: This parameter stands for the job ID. WHAT: This is the code to be executed, and it can be plain SQL or a PL/SQL module.

If you have a black box and it does not work well, what are you going to do about it About the only thing you can do is look at it and wonder why it is not doing so well You cannot fix it; you cannot tune it You quite simply do not understand how it works and you made the decision to be in this position The alternative is the approach that I advocate: understand your database, know how it works, know what it can do for you, and use it to its fullest potential..

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