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Figure 4-25. top shows an excellent summary of your system s status as well as the most active processes. One of the best ways to get an overview of process activity on your system is by using ps aux (see Figure 4-26). This displays a list of all processes currently active on your server, and includes a lot of information about each process. The following columns in Table 4-4 are most interesting.

With your pair in tow, you are ready to get down to developing solutions to the stories selected for this iteration. You are working on one of the tasks you have signed up for or working with someone else on one of the tasks that developer chose. Make a note of the time you started working on the task, so you can keep track of your actual time spent on the task for the tracker. Only track the time for your own tasks.

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Name of the user that owns the process. The process identification number (PID). This is a unique identifier for each process active on your system. The relative CPU load. The amount of memory used by the process. The terminal the process is started on. If a is shown, it refers to a daemonprocess that isn t connected to any terminal Shows the status of your processes. Displays the time the process started. The name of the process. Will often display the name of the command used to start the process.

It makes it far easier to incorporate changes to your security logic Rather than needing to change your logic in multiple places in multiple applications, you just need to modify it at the database level (or, rather, in your security policy function) It can protect the data regardless of the method of access In other words, if you implemented all of your security logic in your APEX application, you would also need to duplicate that logic in any Java applications that access the same data Similarly, someone could just connect using SQL*Plus and modify the data directly, thereby circumventing the security logic of your application By using the VPD functionality, you can protect the data no matter which application the user uses to connect to the database It allows for easier maintenance.

Figure 4-26. ps aux offers a great deal of information about all active processes. On an active server, the amount of information displayed by ps can be overwhelming. Since most of the time ps is used to display information about a specific process, you can pipe the output of the command to the output-filtering tool grep. If, for example, you use ps aux | grep ndsd, the output of ps will be filtered with grep and only the lines in which the string ndsd appears will be displayed. This can make working with ps a lot easier.

By using centralized security policies, which you can apply to many different tables, you decrease the amount of duplicated code you need to write and also make it far easier to modify that code later The point about protecting the data regardless of the method of access is a very important one It s surprisingly common for people to modify data directly using tools such as SQL*Plus and TOAD, rather than using the in-house applications that were built specifically for the purpose Using such tools will circumvent any application, business, and security logic that you have implemented in your application By implementing as much logic as you can in the database, rather than in the application, no matter how the user modifies the data, you can still enforce the checks at the database level..

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