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Full table scans can occur sometimes, even when you have indexed a table. The use of functions on indexed columns is a good example for when you unwittingly can cause Oracle to skip indexes and go to a full table scan. You should avoid the use of inequality and the greater than or equal to predicates, as they may also bypass indexes.

The Scheduler architecture consists of the job table, job coordinator, and the job workers (or slaves, as Oracle calls them). The job table contains information about jobs, such as the job name, program name, and job owner. You can examine the job table by using the DBA_SCHEDULER_JOBS view. The job coordinator regularly looks in the job table to find out what jobs to execute. The job coordinator creates and manages the job worker processes, which actually execute the job. When you create a new job or execute a job, a background process (cjqnnn) wakes up and coordinates the running of the job. When the job coordinator tells a job worker to execute a job, the worker process starts a new database session and starts a transaction. It executes the job, and once completed, it commits and ends the transaction and terminates the database session. The job worker updates the job table, the run count, and the job log table.

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Performance tuning involves the optimization of SQL code and the calibration of the resources used by Oracle. The developers generally perform SQL tuning, and the DBA merely facilitates their tuning efforts by setting the relevant initialization parameters, turning tracing on, and so on. Nevertheless, the DBA can implement several strategies to help improve SQL processing in his or her database. In some cases, you and the developers might be working together to optimize the application. What if you can t modify the code, as is the case when you re dealing with packaged applications Alternatively, what if even the developers are aware that major code changes are needed to improve performance, but time and budget constraints make the immediate revamping of the application difficult There are several ways you can help without having to change the code itself. It s common for DBAs to bemoan the fact that the response times are slow because of poorly written SQL. I ve heard this in every place I ve worked, so I assume this is a universal complaint of DBAs who have to manage the consequences of bad code. A perfectly designed and coded application with all the right joins and smart indexing strategies would be nice, but more often than not,

Oracle creates all jobs, programs, and schedules in the schema of the user that creates these objects, but it creates all the advanced Scheduler components, like job classes, windows, and window groups, at the database level, and their owner is the SYS schema. The SCHEDULER_ADMIN role contains all Scheduler system privileges, with the WITH ADMIN OPTION clause. The DBA role contains the SCHEDULER_ADMIN role. The MANAGE SCHEDULER system privilege lets you do the following: Create, drop, and alter job classes, windows, and window groups. Stop any job. Start and stop windows prematurely.

that perfect state of affairs doesn t happen. The theory of the next best option dictates that you should do everything you can to optimize within the limitations imposed by the application design. That said, let s look at some of the important ways in which you can help improve query performance in an application, even when you can t change the code right away.

All Scheduler objects are of the form [schema.]name. By default, all scheduler object names are in uppercase, unless you wrap the lowercase names in double quotes, as in "test_job".

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