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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.

Private Sub ConnStateChange( _ ByVal sender As Object, _ ByVal e As StateChangeEventArgs _ ) _ Handles conn.StateChange

/: The root directory of the file system always has its own file system, which is also referred to as the root file system The root file system is rather simple: it contains everything that hasn t been split off to another partition If no data files are stored here, 8 GB is typically large enough /var: The /var directory is used by lots of processes that need to create files on your server dynamically (such as printer spool files) However, because the /var directory is so very dynamic, it has an increased chance of problems So it s always a good idea to put it on its own partition In a normal environment, 4 GB is a reasonable amount of disk space to assign to this partition.

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Multiple events can be handled by the same handler, by specifying a commaseparated list of events after Handles. In this chapter, we ll discuss events raised by ADO.NET objects and how to handle them. Although events can be raised by other objects, this chapter deals only with events raised by ADO.NET objects.

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.

/home: The /home directory belongs to the user and is where he or she will store files if the server is a file server Because it also is very dynamic and users are accessing it all the time, make sure that it also has its own partition The amount of disk space you reserve for this partition depends on how much space you want to grant to your users /srv: The /srv directory is used by servers such as the Apache web server and the FTP server to store data Because files in this directory can be accessed by users that make a connection from the Internet, it should have some extra security A simple way to do this is to place it in its own partition The amount of disk space on this partition depends on how you are going to use your server.

Events are raised when a specific property of an object changes. Although objects can raise several events, we ll discuss only a few, because all can be handled in the same fashion. You ll use the System.Data.SqlClient .NET data provider, but all data providers handle events in a similar way.

Data integrity means that data values in a database are correct and consistent. There are two aspects to data integrity: entity integrity and referential integrity.

The connection object has two events: StateChange and InfoMessage. Let s look at these in more detail.

If it is a public FTP server, assign it the maximum space; if your servers serve web or FTP files only occasionally, you can keep the disk space in this directory quite moderate..

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