DATABASE MANAGEMENT SYSTEM

Database Management System



Database Management System

Introduction

Database Management Systems come in many shapes and sizes. For a few hundred dollars, you can purchase a Database Management Systems for your desktop computer. For larger computer systems, much more expensive Database Management Systems are required. Many mainframe-based Database Management Systems are leased by organizations (Seltzer, 2008). Database Management Systems of this scale are highly sophisticated and would be extremely expensive to develop from scratch (Jain, 2002). Therefore, it is cheaper for an organization to lease such a Database Management System program than to develop it. Since there are a variety of Database Management Systems available, you should know some of the basic features, as well as strengths and weaknesses, of the major types (Gupta, 2009).

Discussion

Databases and Database Management

Database management systems with appropriate data storage patterns are responsible for supporting the above characteristics of multi-tenant SaaS applications with good performance. The key problem to be fixed during the fulfilment of the process is how to avoid twice execution of action property jComboBox and itemStateChanged, while it is triggered when state of item, including Selected and deSelected changes. When any changes in drop-down list, there are twice triggers: first, the State of the previous selected item is changed from Selected to deSelected; second, the State of the current selected item is changed from deSelected to Selected (Wang et al., 2009). If there is no condition control, the code in the ItemStateChanged event will surely be executed twice.

A Distributed database is a system built on a computer network instead on a standalone machine. The information that forms the database is stored on different websites, and applications running on different data access sites. A Distributed database represents a logical collection of data that belong to a single system, but is physically scattered in several sites of the network. A system of distributed database consists of a set of sites, connected together through some type of communications network. Database systems are complex, and building them is hard. Therefore, any tool that aids in understanding the tradeoffs involved in building a distributed system is helpful. Nonetheless, fundamental tradeoffs also exist that limit the capabilities of distributed systems during normal operation, and these tradeoffs have influenced the different design choices of the well-known distributed database systems.

Hierarchical Databases (DBMS), commonly used on mainframe computers, have been around for a long time. It is one of the oldest methods of organizing and storing data, and it is still used by some organizations for making travel reservations (Jain, 2002). A hierarchical database is organized in pyramid fashion, like the branches of a tree extending downwards. Related fields or records are grouped together so that there are higher-level records and lower-level records, just like the parents in a family tree sit above the subordinated children (Codd, 2000).

The major role of the distributed database, located in integration layer as the comprehensive backup of all database in base layers, is to restore images information in a timely manner, ensure information integrity and nonstop internal ...