TAILIEUCHUNG - OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P93

OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P93:There is an ever increasing demand for staff with IT industry certification. The benefits to employers are significant—they can be certain that staff have a certain level of competence—and the benefits to the individuals, in terms of demand for their services, are equally great. Many employers are now requiring technical staff to have certifications, and many IT purchasers will not buy from firms that do not have certified staff. | OCA OCP Oracle Database 11g All-in-One Exam Guide 876 The Scheduler described in Chapter 22 runs jobs automatically at certain times and repeatedly at certain intervals. The jobs will usually be defined by the DBA but following creation of a database with the DBCA there will be three tasks configured within what is called the AutoTask system. These AutoTasks are Gathering optimizer statistics Running the Segment Advisor Running the SQL Advisor The AutoTasks run within the Scheduler s maintenance windows. The maintenance windows are defined to open at 22 00 every weeknight and to close four hours later at 02 00 and on Saturday and Sunday to open at 06 00 closing 20 hours later at 02 00. The Scheduler is linked to another database facility the Resource Manager described in Chapter 21. The Resource Manager plan that is activated during the maintenance window is one that ensures that no more than 25 percent of machine resources are dedicated to the AutoTask jobs meaning that running these tasks should not impact adversely on other work. If the maintenance window time frames are not suitable for your database workload they are adjustable if the maximum of 25 percent resource usage is too high and causes performance for other work to degrade this too can be changed. The underlying assumption is that the AutoTasks will run at a time and with a priority that is unlikely to cause problems for regular work for end users. EXAM TIP There are three automated maintenance tasks gathering optimizer statistics the Segment Advisor the SQL Tuning Advisor. The advisors run automatically but the recommendations must be accepted or ignored manually. The tasks run in the maintenance windows which by default open for 4 hours every weeknight at 22 00 and for 20 hours on Saturday and Sunday opening at 06 00. For any of the AutoTasks to run the STATISTICS_LEVEL parameter must be set to TYPICAL the default or ALL. The simplest way to manage the scheduling of the AutoTask jobs is through .

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