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Almost all applications require persistent data. Persistence is one of the fundamental concepts in application development. If an information system didn t preserve data when it was powered off, the system would be of little practical use. When we talk about persistence in Java, we re normally talking about storing data in a relational database using SQL. We ll start by taking a brief look at the technology and how we use it with Java. Armed with that information, we ll then continue our discussion of persistence and how it s implemented in object-oriented applications.

Windows XP Professional does not allow you to modify the drive letter for the system and boot partitions.

10-12

You, like most other developers, have probably worked with a relational database. Most of us use a relational database every day. Relational technology is a known quantity, and this alone is sufficient reason for many organizations to choose it.

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Windows XP also allows you to mount a volume by using a path instead of assigning a drive letter For example, you could create a folder named C:\Files You could then assign the C:\Files path to a new volume labeled Files When you open the C:\Files folder within Windows Explorer, you would actually see the information that is stored on the Files volume This type of volume is referred to as a mounted volume, and the folder that the mounted volume is attached to is referred to as a volume mount point You can create multiple volume mount points for a single volume You can dismount and move a mounted volume to another volume mount point if necessary Mounted volumes provide a method of extending the perceived available space on an existing volume without extending the volume s actual size.

But to say only this is to pay less respect than is due Relational databases are entrenched because they re an incredibly flexible and robust approach to data management Due to the complete and consistent theoretical foundation of the relational data model, relational databases can effectively guarantee and protect the integrity of the data, among other desirable characteristics Some people would even say that the last big invention in computing has been the relational concept for data management as first introduced by EF Codd (Codd, 1970) more than three decades ago Relational database management systems aren t specific to Java, nor is a relational database specific to a particular application This important principle is known as data independence In other words, and we can t stress this important fact enough, data lives longer than any application does.

Technically, a mounted volume is a separate volume, but in the user s eyes it appears to be an extension of an existing volume Therefore, you can use mounted volumes to increase the amount of disk space that is available on a basic volume to include disk space on another hard disk (remember that you cannot actually extend a basic volume to include space on another disk) Also, mounted volumes provide a method for managing multiple volumes of information from the same drive letter Volume mount points are supported on NTFS volumes only The volume that is being mounted can be formatted with any supported file system To add a mounted volume to an existing volume, follow these steps: 1 In Windows Explorer, create a folder on an NTFS volume to serve as the volume mount point 2.

In Disk Management, locate the volume for which you want to modify the drive letter or path information 3 Right-click the volume and select Change Drive Letter And Path from the Action menu 4 In the Change Drive Letter And Paths For New Volume dialog box, click Add to create a new mounted volume 5 In the Add Drive Letter Or Path dialog box, click Mount In The Following Empty NTFS Folder and enter the path to the volume mount point, as shown in Figure 10-6..