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Every application in APEX has a unique identifier an application ID assigned to it. This ID is used to identify the application and the associated metadata within the APEX repository. When you move applications between different APEX environments, such as between your development and test environments, you might encounter problems if you have hardcoded any references to values that may be different in these environments. Unless you can be absolutely certain that the application ID and any other references are exactly the same in the different environments, you should not hard-code any of these references. You can avoid hard-coding the application ID by using the APP_ID substitution string. Here is an example of a typical URL where the application ID (112) has been hard-coded: f p=112:1:&APP_SESSION.: If you import your application into an APEX environment that already has an application that uses the same application ID, forcing you to use a different ID, you may forget to update your hard-coded references. In that case, your links will be pointing to the wrong application. To avoid this, you should use the APP_ID substitution string, which will be replaced with the actual ID of your application at runtime. Using this substitution string, the URL now looks like this: f p=&APP_ID.:1:&APP_SESSION.: This makes your application more portable between APEX environments. Although it is not common for pages to be renumbered, you can also avoid having to hardcode a page ID by using the APP_PAGE_ID substitution string. This can be useful where you have a branch on a page that branches back to the same page.

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A page within an application can also have an alias defined for it. For example, you may give page 1 the alias of HOME, as shown in Figure 1-10. Now, rather than using a URL such as this: f p=&APP_ID.:1:&APP_SESSION.: you can use this URL: f p=&APP_ID.:HOME:&APP_SESSION.:

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On most Linux systems, the default umask is set to 022, which does apply the read permission to others on all new files created. If you consider this an insecure situation, you can change the default umask to 027. The problem with umask is that it is not just a command. It is an environment variable that has to be set every time a user logs in to the system. In order to do so, you have to change the umask-value specified in the login-script for your system: /etc/profile (shown in Figure 4-29). Be careful when making changes to this file, because it s a complex shell script and even a minor mistake can cause severe problems.

Figure 1-10. Defining an alias for the page By using the alias in the reference, you will be able to renumber the pages, and the URL will still be pointing to the correct page. You should use substitution strings to avoid hard-coding any other references to resources (such as style sheets) in templates and HTML regions. This will give you great flexibility for changing the location of those resources, whether they are uploaded into the database or are stored on the file system. For example, if you stored all your images in the database by uploading them through the Application Builder interface, you might refer to a particular image file like this: <img src="#APP_IMAGES#logo.gif" type="image/jpeg" /> At runtime, this will be expanded to reference the download procedure that is used for accessing static files that have been uploaded into the database. The text that is substituted at runtime will be something like this: wwv_flow_file_mgr.get_file p_security_group_id=986113558690831&p_flow_id=112&p_fname =logo.gif However, if you now wanted to store the images on the file system rather than storing them in the database, you would need to change every reference like this one to use a different path to the file. To simplify and minimize the number of changes you will need to make, you can define a substitution string that will be used in place of the #APP_IMAGES# substitution string. You can find the Substitution Strings section on the Application Definition page in the Shared Components part of the Application Builder, as shown in Figure 1-11. When you define the substitution string IMAGE_PATH for the value #APP_IMAGES#, the URL then looks like this: <link rel="stylesheet" href="&IMAGE_PATH.logo.gif" type="text/css" />

Figure 9-6. Selecting the Intruder Detection option lets you know if someone s trying to break into a user account. 3. Select the number of incorrect login attempts and the intruder attempt reset interval. The default value will look for seven incorrect login attempts within 30 minutes. This allows an intruder to try to log in more than 300 times with the wrong password in a 24-hour period! For a more restricted setting, I recommend limiting the number of incorrect login attempts to four in a 24-hour period. This lets a user make a few mistakes while entering his password, but also nicely limits an intruder who tries to log in repeatedly with the wrong password.

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