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A primary key is an attribute (column) or combination of attributes (columns) whose values uniquely identify records in an entity. Before you choose a primary key for an entity, an attribute must have the following properties: Each record of the entity must have a not-null value. The value must be unique for each record entered into the entity. The values must not change or become null during the life of each entity instance. There can be only one primary key defined for an entity. Besides helping in uniquely identifying a record, the primary key also helps in searching records as an index automatically gets generated as you assign a primary key to an attribute. An entity will have more than one attribute that can serve as a primary key. Any key or minimum set of keys that could be a primary key is called a candidate key. Once candidate keys are identified, choose one, and only one, primary key for each entity. Sometimes it requires more than one attribute to uniquely identify an entity. A primary key that consists of more than one attribute is known as a composite key. There can be only one primary key in an entity, but a composite key can have multiple attributes (i.e., a primary key will be defined only once, but it can have up to 16 attributes). The primary key represents the parent entity. Primary keys are usually defined with the IDENTITY property, which allows insertion of an auto-incremented integer value into the table when you insert a row into the table.

Each person who wishes to log into 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 (even hardware devices are files; see 10), 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.

Note As in real life, a group can have many members and can be based around various interests. In a business environment, this might mean that groups are created for members of the accounting department and the human resources department. 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).

Summary

On a default Ubuntu system with just a handful of users, the group concept might seem somewhat redundant. However, the concept of groups is fundamental to the way Ubuntu works and cannot be avoided. Even if you don t use groups, Ubuntu still requires your user account to be part of one. In addition to actual human users, the Ubuntu system has its own set of user and group accounts. Various programs that access hardware resources or particular sets of files are part of these groups. Setting up system users and groups in this way makes the system more secure and easier to administer.

A foreign key is an attribute that completes a relationship by identifying the parent entity. Foreign keys provide a method for maintaining integrity in the data (called referential integrity) and for navigating between different instances of an entity. Every relationship in the model must be supported by a foreign key. For example, in Figure 3-1 earlier, the Customers and Orders tables have a primary key and foreign key relationship, where the Orders table s CustomerID field is the foreign key having a reference to the CustomerID field, which is the primary key of the Customers table.

On most Linux systems, the root user has power over the entire system. Root can examine any file and configure any piece of hardware. Root typically belongs to its own unique group, also called root. Ubuntu is different from most Linux distributions in that the root account isn t used by default. Instead, certain users including the one set up during installation can borrow root-like, or superuser, powers by simply typing their login password. This is done by preceding commands with sudo or gksu at the command-line prompt, or as needed when using GUI programs that affect system settings. For some programs, including Users and Groups (System Administration Users and Groups), you need to click an Unlock button to gain superuser powers. Until you unlock the Users and Groups program, most of the buttons are grayed out and unusable. If you wish, you can activate the root user account on your system for administration purposes. To activate the root account, use the following command in a terminal window (see Appendix A for details on issuing commands in a terminal window): Sudo passwd root

This chapter introduced you to DTDs and schemas. You learned how to create a DTD and a schema. You also learned to use Visual Studio tools for creating XSD schemas. The .NET Framework s Schema Object Model (SOM) is an extensive collection of objects that allows you to create XSD schemas programmatically. You learned some of the important and commonly used classes from the SOM hierarchy.