DBS401 Assignment 3 Christopher Canning 55858317
Question 1: [5]
Explain why are entity integrity and referential integrity important in a database?
Entity Integrity:
The relational model states that every relation, it must have an identifier, called the primary key (PK), in such a way that every row of the same relation be identifiable by its content, that is, by a unique and minimal value. The PK is a non-null set of attributes. The same format applies to the foreign key (FK) because each foreign key matches an existing primary key. A simple constraint of database relational model (RM) that refers to the analysis of the primary key, but afterwards, the same format is applied to the foreign key and, also to any of simple components
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An ER diagram’s structure should depict a company’s operations if the database is required to meet the organization's data requirements. It forms the foundation for whether the included entities are correct and adequate as well as on the relationships between those entities. It is also used as a final cross check against the proposed data dictionary entries, in other words, the data dictionary contains descriptions about the data objects. When designing database tables, the difference between a good, efficient design and a bad design can be a few seconds in response time to several minutes. The completed ER diagram also lets the designer communicate more precisely with those who constructed the database design. The completed ER diagram serves as the implementation guide to those who create the actual database, so essentially the ER diagram is as important to the database designer as a blueprint is to the architect and …show more content…
The only importance of the surrogate key is to act as the primary key. It is also possible that the surrogate key exists.
A surrogate key is frequently a sequential number. Some databases provide a universally unique identifier (UUID) as a possible data type for surrogate keys.
Having the key independent of all other columns protects the database relationships from changes in data values or database design, which in turn makes the database more agile and guarantees uniqueness.
In a temporal database which comes with built-in support for handling data involving time, it is necessary to distinguish between the surrogate key and the business key. Every row would have both a business key and a surrogate key. The surrogate key identifies one unique row in the database, the business key identifies one unique entity of the modelled world. One table row represents a snapshot of time holding all the entities attributes for a defined time period. Those slices depict the whole lifespan of one business entity. For example, a table “EmployeeContracts” may hold temporal information to keep track of working hours of employees. The business key for one employee will be identical in both rows however the surrogate key for each row is
31. Which level of RAID refers to disk mirroring with block striping? a) RAID level 1 b) RAID level 2 c) RAID level 0 d) RAID level 3 Answer: a 32. A unit of storage that can store one or more records in a hash file organization is denoted as a)
4. Strong collision: given a message M1, it is not possible to find two distinct messages such that h (M1’) = h (M1). The probability of this collision is 2n/2.
DBQ The American Founding lasted for twenty five years from 1775-1800. During that time, the United States declared and won its independence, a gradual revolution in the political, social, and economic landscape was begun that was not completed by 1800. This war had laid the groundwork for a better country, but the changes had not fully been established.
In the 19th century china and japan were under pressure when the west opened up foreign trade and relations. The industrial revolution created a wide gap between them and the west and left them behind in technology and the military. They both signed unequal treaties that forced them to open their ports and cities to foreign merchants. Both country's reacted very differently and this will be the topic of this essay.
The information or data that needs to be stored could relate to personal employee information that would need to be password protected so only the relevant people can gain access. Only if date if stored in a procedural manner can it be easily retrieved. This can also help if an external body needs to gain access to records for example auditors. Describe the features of different types of systems used for storage and retrieval of information. There are many different ways in which you can store and retrieve information; the main purpose of storing any information is for easy retrieval in the future when it is
Summary of “Academic Integrity” by Arden Miller and Adena D. Young-Jones Which one do you believe cheats more in schools, an online course or a face to face course? Arden Miller and Adena Young-Jones did an article over which one tended to be worse when they found results that were kind of shocking. Of course you expect an online course to cheat more but that was not the case. The results really varied on who the person was, sexuality, age, and other personalities of a person. Arden and Adena, both took surveys of “639 students in both types of classes.
Integrity can be defined as being honest and having strong morals. Being able to balance one’s own integrity and professional responsibility is what determines how successful they will be. If someone’s personal integrity and professional responsibility aren’t balanced, they will interfere with or hinder the other. Ultimately, a person is successful if they can balance their personal integrity and professional responsibility.
A.1.b. Records and documentation. A.1.d. Support network involvement. A.2.a.
The Behavior Analysis Unit (BAU) is a segment of the FBI that look for criminals that are of high risk. They are a cerial killer unit. To fully know about the Behavior Analysis Unit (BAU) the units, risks, conditions should all be understood. The BAU is a group of FBI agents that tend to work on high profile cases.
ADMS 2511. Management Information System Section Q Raqib Ibrahim Prof. M.Zia ul Haq 215251754 Case Assignment 1 Question A i) Data items: Example of Data in Lululemon case is sales over $1 billion. Data item is a set of description which gives information but does not convey a meaning. ii) Information: As stated above the sales resulted in over $1 billion but actually the 10 percent of those sales were from the Internet store.
These values have a cultural variance according to the majority or an individual’s immersion, creating a tension as to whom has integrity? This confusion requires a solution through clear definition, provided by the Miriam Webster dictionary. Integrity is a firm adherence to a code of especially moral values: incorruptibility (Miriam Webster, n.d.). These moral values of right and wrong are definable under legislative and common laws, as well as
Introduction Academic Integrity is an essential component of third level education because it is the fundamental building block in which we derive our professional ethics and integrity from. It sets a pattern for life long integrity in all areas of life. Our job as students is to construct knowledge honestly and fairly. A culture of honesty earns a great deal of respect. Integrity is fundamental to everything we do in college, I don’t think we can have genuine learning without integrity.
Integrity is a term used to describe a person 's level of honesty, moral commitments, and willingness to do what 's right. Choosing what is right over what is fun, fast or easy, and choosing to practice our values rather than simply professing them. Given the real definition of integrity, we recognize that it is actually extremely difficult to be in integrity 100% of the time. We aspire to be in integrity with what we believe but sometimes, we mess up. Sometimes, our emotions get the best of us and we are unable to manage our behavior and actions.
One of the most crucial traits a scholar can develop is a high level of self-efficacy which is essential to academic success. The ability to achieve and to recognize that success can come from being industrious should be the deterring factor for a student who considers committing the act of plagiarism. What is plagiarism one might ask? Voelker, Love & Pentina (2012) define plagiarism as, “putting forward another’s work as your own” (p. 37). This very pervasive problem plagues the education system, and many researchers and psychologist seek to explain the driving force behind students’ academic dishonesty.
In a relational database management system the data access is privileged which means that the database administrator has the authority of giving access of data to some particular users which makes the data secure. 3. Easy to use: This type of database uses tables which is better and easy to create and use. Disadvantages of RDBMS: 1. Slow: