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For the installation of software and the management of installed software, Novell now uses the open-source Red Hat Package Manager on both OES platforms. This allows administrators to develop a standard for managing software platforms no matter what platform they use. On OES - NetWare, RPM can be used to install software. The old graphical Novell install utility can also still be used. For the most advanced way to manage software on servers and workstations, the Novell ZENworks suite can be deployed. You can read more about these services in 13.

Using once per session evaluation instead potentially reduces the number of queries the database needs to handle in a day by around 9,000 (to around 1,000 times a day once for each user, assuming a user logs in for only a single session). You might say, So what The query was running really quickly anyway! Don t forget that anything you do in a multiple-user system can impact other sessions running in that database. So even if your query runs blisteringly quickly, if you don t need to do it, then don t do it. Your individual business requirements should determine whether every page view or once per session is best for that particular authorization scheme. In the example, promoting users to administrator status will not happen very often, so you do not need to reevaluate that check every time a page is viewed; once per session is a reasonable choice. Reevaluating your authorization schemes more often than necessary not only gives the database more unnecessary work to do, but may also negatively impact the impression your end users have of the application, if the pages take longer to refresh than they should.

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An entirely different part of Open Enterprise Server, are the Network Services. Of course, all standard Linux network services are present on OES - Linux, but OES - NetWare has some interesting extras. One of these is the option to integrate the DNS and DHCP configurations in eDirectory, which allows for optimal fault tolerance of these fundamental network services. Another important network service is the Service Location Protocol (SLP), which allows for dynamic maintenance of lists of available services on the network. SLP is supported on OES NetWare as well as OES - Linux. More information about these services is provided in 14.

There is actually an alternative to making the user log out and then back in again when your authorization scheme is set to reevaluate once per user session. You can invalidate the caching of the authorization scheme values in the current APEX session with the following call: apex_util.reset_authorizations; This will force the authorization schemes to be evaluated again the next time they are referenced. As an example, suppose you added a new Reset Auths button to the report page, and also added a new PL/SQL page process that makes a call to apex_util.reset_authorizations whenever the Reset Auths button is clicked. Now if the john user (who is not an administrator) logs in to the application, he will see the screen shown in Figure 4-44. Notice that the report columns are still being hidden by conditions applied to the individual columns, rather than by the authorization scheme. Here, you are concerned only with the status of the Create button, since that page item is using the IS_ADMIN_USER authorization scheme.

Novell has always been innovative with regards to network printing. For many years, the company has provided the robust system of queue-based printing, which looks a lot like the UNIX lpd-based printing environment. Of more recent date is Novell Distributed Printing Services (NDPS), which allows printers to be configured automatically and printer drivers to be downloaded to users workstations automatically. Other advanced options, such as bi-directional communication

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