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Many modern systems need to be distributed and scalable. Consider an example of a distributed application that performs some database-intensive tasks. A typical programming approach is to open a live connection with the database and maintain it as long as the database-related tasks are in progress. This is fine if the number of users is small, but as the user base grows, the available database connections become precious. In such heavily loaded systems, a live connection approach is not recommended. The alternative is to have offline or disconnected access to the data. Disconnected data access involves the following steps: 1. Establish a connection with the database. 2. Fetch the data that you require and store it in some offline medium. 3. Close the database connection. 4. Work with the fetched data (perform read, modify, and delete operations or even calculations). 5. Again, open a database connection if you wish to update the changes made to the data back to the database. 6. Update the database, if there are any changes. 7. Close the database connection.

Summary

In this chapter, you looked at streamlining your installation of Ubuntu. This involves speeding up the boot procedure by running boot scripts in parallel, and decreasing the boot menu delay, along with a handful of other tricks. You also looked at optimizing your hard disk settings to allow for greater speed when loading and saving files. Additionally, we discussed prelinking programs so that they load faster, recompiling the kernel so that it s optimized for your system, and freeing disk space by various means. In the next chapter, you learn how to perform backups to safeguard your data.

As you can see, the database connection is opened only when required. You will typically use disconnected data access in the following situations: Your application data can be updated in batches. Your application does not need up-to-the minute data from the database. You want to pass data across multiple layers of your system. You want to pass data from your application to another application. Your application data is generated programmatically and is not coming from any data source. This disconnected data access is provided by a DataAdapter and a DataSet class. You will learn more about these classes in upcoming sections.

Figure 15-13. Selecting an image 7. The image added to the Master Page may not be the size you want it to be, in which case you should set its Size and Width properties in the Properties window. The Pearl HR.JPG image used in this exercise was added at its full size, so we have set its Height and Width properties to 53px and 153px, respectively, to appear as a logo having the proper dimensions on the page. 8. Now drag a Label control above the ContentPlaceHolder and to the right of the Image control. Open the Properties window, set this Label control s Text property to the text you want (for example, we have set it to Pearl HR Solution), and then set its Font Size to XX-Large. Now your Master Page is ready (see Figure 15-14).

Every computer user knows that backing up data is vital. This is usually because every computer user has lost data at some point, perhaps because of a corrupted file or an accidental deletion. Some of the people behind UNIX were highly aware of such occurrences, and built in several advanced and useful backup tools. These have been mirrored within Linux, with the result that creating and maintaining backups is easy. In this chapter, you first look at what data should be backed up and then explore two ways to make backups: via the Simple Backup utility and the command line.