History of Relational Database

Hao-Wei He Wilmington University October 9, 2010 Abstract Database system have been inseparable with our daily life, since IBM developed the hierarchical database management system in 1969, database system has been innovated many times, such as hierarchical database, network database, relational database, and object-oriented database. Nowadays, relational database still is the most popular model used by different industries; this article is going to introduce the history of the relational database.History of Relational Database Data, which can be defined as an entity of meaning, it is the original material to construct message and knowledge. Thanks to the assistance of computer, data processing practices reached several important milestones. The earliest way to store data are done through manual file management, all documents will be filed and then store, but this method had many processing restrict, such as search, storage takes up a lot of space, and cannot be access by people at t he same time.After IBM announced the first set of hard disk drive for data storage in 1956, due to the innovate development of hard drive, and the access speed much faster than magnetic tape, it replaced the tape drive gradually, and then direct access file system developed. Although direct access file system could access each files directly and improved a lot of missing, but since the objects are files, it still lack of flexibility of processing. Database can be considered to automatically query and modify data sets.There are a variety of database types; from the simplest store all kinds of information forms to large-scale database systems that able to process a variety of mass data storage, are widely used in all inspects of applications. The advantages of database management system: * Reduced redundancy * Integrated data * Integrity * Data commonality * Protect data safety and privacy The disadvantages of database management system: * Overall operating cost will increase * More c omplex to use Need to backup regularly, or unexpected conditions will cause serious data damage * Hard to training database administrator * Difficult to integrate or manage different format from multi systems Therefore, there was an idea about divide files into a sum of record, and store it as an unit in the computer, it also formed the â€Å"Centralized Database System†, it can record a record through hard disk drive, and can directly navigate to the record or fields for further data processing and computing.This concept also derived to the following data types: * Hierarchical Data Model (1960s) Use record as a processing unit, and organize record by tree structure. As a result of the characteristic of tree structure, hierarchical data model particularly suitable for describe â€Å"One to Many† data composition relationship but â€Å"Many to Many† relationship. * Network Data Model (1970s)As a result of the tree structure does not reflect network connection rel ationship between data and data, so after hierarchical data model, some groups proposed â€Å"Network Data Model†, organize records by network structure. However, records in both Hierarchical data model and network data model use link to strung together, so when programming applications must accommodate the structure status between links, a lot of dependencies between programming applications and data structure, and the independence of data is hard to reach, cause the system difficult to maintain. Relational Data Model (1970 ~ present) Edgar Codd, a British computer scientist, proposed â€Å"Relational Data Model in 1970, emphasize the applications should not have any dependencies with internal structure of data, it also known as â€Å"Data Independence†, this data model lead the development of the database system entered a new milestone. In relational data model, data use record as a processing unit, and organize record in tabular form.The applications just face to t he tabular structure, without to understanding the internal structure of the data. Conclusion Relational Database Management System (Relational DBMS) is the most widely used database management system in recent years, the mainly reason is the concept of relational data models is simple, and the basic theory was developed very completely. Since Relational Database management System be proposed in 1970, almost all the commercial database management systems are based on this model.We often hear of the data table, is a relational database foundation.References Yung-Fang Chen, Relational Database management system lecture, Retrieved from http://allen. chen. name/teachdata. htm Jeffrey H. , Mary P. , & Heikki T. (2009). Modern Database Management 9th Edition. Upper Saddle River, NJ: Pearson Shou-Jeng Tseng. Review Database System and Future Research Develop. Taiwan, Retrieved from http://www. iicm. org. tw/communication/c1_1/page02. html.

How valid is the view that, “in the period 1796-1870 the most serious barrier to political change in Italy was widespread apathy among the people?

In 1871 Italy became a unified nation, however in the period of 1796-1870 there were many barriers, which prevented the political change in Italy. The widespread apathy of the people certainly did effect the unification of Italy, however there were other barriers such as the foreign influences of Austria, the un-organisation of the revolts and the fact that at the beginning the Risorgimento was more for the elitist class. So it is not valid to say that apathy was the most serious barrier as there were other factors that together made it difficult for Italy to become united. One factor that was particularly influential was the power Austria has over Italy. Austria was a major power at this time with a large empire. During this period there were a number of revolutions across Europe. Austria and Russia were both conservative monarchists that were determined to suppress any nationalistic movements as possible as they were worried about the spread of revolutions affecting their own countries. Austria spread its influence in Italy by installing members of the Austrian imperial family, the Hasbburgs, to rule in many Italian states. This was used for a more pro-Austrian attitude and a less patriotic nationalistic attitude to their own country; Italy of 1815 was basically under control of the Austrians. Metternich said at the time; â€Å"Italy is only a geographical expression.† It is clear that Austria were a major influence and helped to prevent Italy from developing it's own identity thus preventing unification- which was Austria's main aim. It is true to say that Austria exerting it's power over Italy does show the apathy of the people as they didn't seem to do very much about it, or appear to concerned for some time. Less than 3% of Italians spoke Italian, and as communication wasn't very good it was hard for Italy to feel like one unified country as they were so separated. People's sense of pride was what was missing in Italy. People were very attached to their own particular region and in a sense were not affected by what happened in other areas of Italy, especially the north-south divide. It could be argued that this un-communication between different areas of Italy proves that apathy among the people did prevent unification, as the Italians were obviously not prepared for it. However if the government gave the public a reason to be proud and patriotic, and given them a sense of unity they probably would have reacted and been more unified. In fact not all Italians did have this apathetic attitude towards unification. There were attempts of revolutions in 1820 and 1831, but the force of the Austrians easily crushed these attempts. The Carbonari (1820s) were a secret society attempting change but didn't work as there were too few of them. There are also examples in radical democrats such as Garibaldi and Mazzini that played a big part in the unification process as they really believed in it and managed to spread the message more too the masses. This was another barrier to political change that there was little support for the attempts at revolution. This was to do with the fact that the Italian people has been led to believe that democracy was a thing to be feared, and unification may make Italy worse. Also during the beginning the Risorgimento was more of an elitist phenomenon, where only people of education and urban centres could get to hear about it. There was also a lack of co-ordination and confusion between the different ideologies that proved to make revolutions difficult. The Italian public were also unsure of what type of Italy would result after a revolution has taken place. There was particularism between some Italians and their own states as they may have felt they were better off not unified as it may change things in a way they didn't like. Before the Crimean war (1854-56) there seemed to be little chance of Italian unification as the country was so divided and controlled so greatly by Austria. The Crimean war changed a lot of things in Europe. The war was the resultant reason for the two major powers of Austria and Russia to break their alliance. Russia was humiliated in the war and was un-supported by Austria. Russia felt like it had been denied to be seen as the major power that it was. Russia therefore was un-supportive of Austria and changed it's policy, having been before quite conservative, to an attitude favourable of change. With the weakened force of Austria and its plight to prevent democratic states, people like Garibaldi creating a new found patriotic atmosphere among Italians, by 1871 Italy was unified. Overall it is valid to say that the apathy of the Italian people was a barrier to political change. In some ways the apathy of the people was not just because they weren't bothered but because the majority did not receive information about the Risorgimento till quite late. However it is more the foreign opposition of Austria that was more of a powerful prevention to change that affected the unification process more than the apathy of the people. It was partly due to the â€Å"domino effect† the Austrian influence had that did help to encourage the apathy of the people, as Austrians were so desperate to reduce nationalism they managed to help prevent Italians from feeling a belonging to a country.

Too Big To Fail

The idea that a business has become so large and ingrained in the economy that the government will provide assistance to prevent its failure. â€Å"Too big to fail† describes the belief that if an enormous company fails, it will have a disastrous ripple effect through shout the economy. The idea of too big to fail should never be possible. No single financial institute should have the power of bringing down our entire economy. The taxpayers should not have to be worried about whether or not their money is safe. There obviously has been a lack of leadership going wrought the economic system.If there were strong leaders put in place originally to deal with this situation, then so many things could have been prevented. A crisis that nearly destroyed our nation would have never even made it to the surface. I blame the lack of leadership for the economical scare. The worlds leaders should have been containing the problem as it started instead of allowing it to get that big and pote ntially blowing up. Fannies Mae and Freddie Mac could have been saved. But instead each bank was focused on their own needs which is understandable and appropriate.But since they were intertwined so heavily was no longer an option. These institutes should have kept their distance to prevent something from happening. Our economical leaders should have practiced better leadership skills and not but all our dollars in one basket. Because just like in 2008, if any piece of that basket were to break or be destroyed we all would go down. The buyout may have worked this time, but that is simple a patch on the service of our overall problem. Get some strong leaders in those seats and all these problem might just go away. Too Big To Fail The idea that a business has become so large and ingrained in the economy that the government will provide assistance to prevent its failure. â€Å"Too big to fail† describes the belief that if an enormous company fails, it will have a disastrous ripple effect through shout the economy. The idea of too big to fail should never be possible. No single financial institute should have the power of bringing down our entire economy. The taxpayers should not have to be worried about whether or not their money is safe. There obviously has been a lack of leadership going wrought the economic system.If there were strong leaders put in place originally to deal with this situation, then so many things could have been prevented. A crisis that nearly destroyed our nation would have never even made it to the surface. I blame the lack of leadership for the economical scare. The worlds leaders should have been containing the problem as it started instead of allowing it to get that big and pote ntially blowing up. Fannies Mae and Freddie Mac could have been saved. But instead each bank was focused on their own needs which is understandable and appropriate.But since they were intertwined so heavily was no longer an option. These institutes should have kept their distance to prevent something from happening. Our economical leaders should have practiced better leadership skills and not but all our dollars in one basket. Because just like in 2008, if any piece of that basket were to break or be destroyed we all would go down. The buyout may have worked this time, but that is simple a patch on the service of our overall problem. Get some strong leaders in those seats and all these problem might just go away.

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An outline marketing plan for the next year for Atlantic Quench 303 Essay

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