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The Scheduler (described in 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 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 Database Control Select the Server tab from the database home page, then the Automated Maintenance Tasks link on the Scheduler section The Automated Maintenance Tasks window, shown in Figure 24-6, displays the window for the next run (which opens at 06:00, because the figure was taken on a Saturday evening) with links for the results of the last two advisor runs Clicking these links will show the recommendations (if any) with an option to implement them (implementing the recommendations is not automatic) The Segment Advisor task relies on the history of object statistics built up by the daily running of the gather Optimizer Statistics Gathering By observing these, the Segment Advisor can see not only how much unused space there is in the tables and indexes, but also whether this space is likely to be needed again, and if not advise that.

n the first part of this chapter, I discuss the general process used in designing web graphics as well as some terminology and details related to web image file formats Then, I move on to tips identifying how to define each piece of your mockup and save each in the best file format for the job

Figure 24-6

the segments should be reorganized The SQL Tuning Advisor task relies on the AWR statistics gathered by the MMON process These statistics include figures on which SQL statements are being executed many times, perhaps millions of times an hour; which statements are responsible for a large amount of disk and memory I/O; and which statements are taking a long time to run These are the high-load statements that will be subjected to tuning analysis To view and adjust the window schedule, click Configure This will take you to the window shown in Figure 24-7, where there are radio buttons for enabling or disabling the jobs; buttons for configuring Optimizer Statistics Gathering and Automatic SQL Tuning jobs; links for editing the opening and closing times of the daily windows; and check boxes for selecting in which windows the various jobs will run TIP The default settings for the maintenance windows may well not be appropriate for you In many Middle Eastern countries, for example, Saturday and Sunday are working days Also, many databases support global organizations: just because it is the middle of the night for you, that doesn t mean it is for many of your end users

Figure 24-7

In 4, I discussed using Photoshop as a web page layout tool For professional web designers, this typically involves creating mockups that clients will review before the page is actually built and coded After those mockups have been approved and are ready to be produced, it s time to slice and dice your files literally This means you have to translate the various pieces of your mockups into web-readable formats that can be rendered by a web browser When slicing and optimizing web graphics, it s important to know which features are available in Photoshop and which are only available in ImageReady (Photoshop s web-specific sister application) In its Help file for Photoshop, Adobe lists the primary differences between Photoshop and ImageReady as the following: Photoshop provides tools for creating and manipulating static images for use on the Web You can divide an image into slices, add links and HTML text, optimize the slices, and save the image as a web page ImageReady provides many of the same image-editing tools as Photoshop In addition, it includes tools and palettes for advanced web processing and creating dynamic web images like animations and rollovers So, when it comes to designing my web pages, I typically use Photoshop However, when I m ready to process the web designs and save each piece as a compressed file capable of being displayed in a web browser, I usually switch to ImageReady Ultimately, the decision is your own, and the only thing for which you definitely have to switch to ImageReady is the creation of animation and interactivity like rollovers

Exercise 24-2: Generate an ADDM Report In this exercise, you will generate an Automatic Database Diagnostic Monitor report on activity between two snapshots 1 Connect to your database as user SYSTEM with SQL*Plus 2 Force the creation of an AWR snapshot:

execute dbms_workload_repositorycreate_snapshot;

3 Simulate a workload by creating a table and running an anonymous PL/SQL block to generate some activity: