DataBases
There are many faces of Databases, a large databases can contain hundreds of interrelated files. Fortunately a database management system can shield users from the inner workings of the system, providing them with only the information and commands they need to get their jobs done. In fact, a well-designed database puts on different faces for different classes of users.
The earliest file management programs could only do batch processing, which required users to accumulate transactions and feed them into computers in large batches. These batch systems werent able to provide the kind of immediate feedback we expect today. Today disk drives, inexpensive memory, and sophisticated software have allowed interactive processing to replace batch processing for most applications. Users can now interact with data through terminals, viewing and changing values in real time. Batch processing is still used for printing periodic bills, invoices, and reports and for making backup copies of data files. But for applications that demand immediacy, such as airline reservations, banking transactions, and the like, interactive, multi-user database systems have taken over. Until recently most databases were housed in mainframe computers. But for a growing number of organizations, the traditional database on a mainframe system is no
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