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inux was designed from the ground up to be a multiuser system. When powerful Linux machines are deployed in huge data centers, they are capable of serving hundreds, if not thousands, of users at the same time. In a more domestic setting, such as when Ubuntu is installed on a desktop PC, multiuser means that several family members can have their own login on the PC. They ll get their own desktop environment that is separate from that of the other users and their own file storage area. And even if you re the only person using your PC, you can still take advantage of Ubuntu s multiuser capabilities. Consider creating user accounts for various aspects of your life perhaps one for work and one for time spent browsing the Web. Each user account can be tailored to a specific need. In this chapter, you ll learn how to administer multiple user accounts.

One of the new features of SQL Server 2005 is its support for the Common Language Runtime (CLR). This support is also available in the Express edition. Using the CLR with the SQL Server means that in addition to using SQL to communicate and process the data, you also have the ability to use code that is written in a .NET-compliant or CLR-compliant language such as Visual Basic .NET or C#. To learn in greater detail about how this works, refer to a more in-depth book on the subject.

The concept of users and file ownership was explained in 14, but let s take a moment to recap and elaborate on some important points.

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Each person who wishes to log in to Ubuntu must have a user account. This will define what that user can and cannot do on the system, with specific reference to files and folders. Because Ubuntu is effectively one large file system, with even hardware devices seen as individual files (see 14), this means that user permissions lie at the heart of controlling the entire system. They can limit which user has access to which hardware and software, and therefore control access to various PC functions. Each user also belongs to a group. Groups have the same style of permissions as individual users. File or folder access can be denied or granted to a user, depending on that person s group membership.

In connected data access, you establish a connection with the database. Then, as long as you are working with the data, you maintain this live connection. The following are the steps that you typically take when using connected data access: 1. Establish a connection with the database. 2. Fetch a set of records in a cursor. 3. Work with the fetched data (perform read, modify, and delete operations or even calculations). 4. Update the database, if there are any changes. 5. Close the database connection.

Note As in real life, a group can have many members and can be based around various interests. In a

When building applications that depend on a data store, especially those containing sensitive data, securing that data is of utmost concern. It was not too long ago that the Slammer virus swept the world, raising a lot of concerns around the security of SQL Server. To address recent security concerns, Microsoft has increased the security features within its SQL Server products.

business environment, this might mean that a group is created for members of the accounting department and the human resources department, for example. By changing the permissions on files created by the group members, each group can have files that only the group members can access (although, as always, anyone with superuser powers can access all files).

The advantage of this model is that you can see changes in the database in real time. However, this approach is not recommended for scalable applications because it can hamper the overall performance and scalability of the system. Also, even though ADO.NET provides cursor-oriented connected data access, it is strictly read-only and forward-only. This incurs fewer overheads and improves performance as compared to updatable cursors. You will typically use connected data access in the following situations: You are developing applications that are online all the time. For example, in a ticket reservation application it is necessary that you work with the latest data from the database. In such cases, connected data access becomes necessary. You want to avoid the overhead of using offline data. When you use queries directly against a database, naturally they bypass any of the intermediate layers that are involved in disconnected data-access techniques. For example, suppose that you wish to display a simple employee listing to the end user. This task does not involve any processing as such. Using connected data access in such cases will of course give the best performance. You need a cursor model for some reason. The Connection, Command, and DataReader classes are used for such connected data access. You will learn about these classes in later sections.

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