Functions Of Database Management System

Functions Of Database Management System Before we start with DBMS we should know what is data. A data is a piece of information, and database is the collection of data that is set in an orderly way. And managing this database is known as Database Management System in short DBMS. The person who manages, creates, controls and maintain this database management system is known as Database Administrator (DBA). Another important term to remember is information. Any data which has been converted to a useful and understandable form is called information. There are some differences between data and information. Data Information Any raw figure or fact is data. For example 6 is a data. A processed form of data is known as information. For example weight = 6 kg is data Data does not help in making decisions. With right information we can make decision. Functions of Database Management System Data Modeling: The structured definition of data storage is known as data modeling. Processing Query: This a mechanism of manipulating the data Concurrency Control: To ensure the accuracy and simultaneous access of the database by multiple users. Security of Information: Security of the database is very important. Crash Recovery: Data recovery after the system crashes. Types of Database users Database Administrator (DBA): The database administrator is the person who who maintains designs and creates the database. Database Designer: A database designer is a person who plans or designs the database. End User: The one who uses the database, it may be that he/she only views the database or it may be that he/she makes the data entries. Make queries, etc There may be different types of end user, for example: Sophisticated: these are the users who has a good knowledge in database and can make queries, with SQL manipulate data with DML (Data Manipulating Language) Specialized: who makes application programs that interacts with the database Native: only interacts with the database via some sophisticated programs Application Programmers: A person who makes applications which interacts with the database using programming language like C++ , Java, etc. He may create a software which gives a easy to use interface to input data into a complex database, so that even the clerks of the office can input data or search for some data from the companies database without knowing Oracle, MySQL or other DBMS software Database Model Database Model is the structure or the format of the data; it may be physical or conceptual. Database Model is also known as database schema. Conceptual Model: Conceptual Model helps to overview the organizational schema rather than the database schema. Physical Model: Physical Model is the database design which means that this model describes the data storage, data structure, etc. basically we get to know about the physical media of the data storage and the mode of access of that data from this model. Frame Memory Model: This type of model is generally used for large manufacturing database application. Modifying the characteristic of the complex database easily and accurately. Unifying Model: in the Unifying Model the Entity-Relation concept has been extended to introduce a new form of diagrammatic representation other than class diagrams. Object Oriented Model: A Object Oriented Model is a data model in which the real life data or entities are organized. Generally Object Oriented Data Model or OODM consists of the following concepts, they are as follows: Object and object identifier Attributes and methods Class Class hierarchy and inheritance Record Based Model: The Record Based Model helps us to specify the overall logical structure of the database. In this type of data bases the numbers of types of data are fixed. And each of the record type or data type has a fixed number of fields with fixed field length. There are three types of record based data model they are: Hierarchical Model: In a Hierarchical Model the data is organized in a form of tree like structure. In this kind of structure the parent à ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬ child relationship can easily be shown. A very famous use of this kind of database is the Windows Registry developed by Microsoft. 320px-Hierarchical_Model.jpg Network Model: This is a type of database model where it is easy to represent objects and relationship. Its more easier to define many to many relation in this model rather than in the hierarchical model. A well known implementation of Network Model is RDM Server. 320px-Network_Model.jpg Relational Model: The relational model was developed by E.F Codd. The properties of a relational database model are as follows: The columns of table are all homogenous i.e. they are of the same kind. Every item should have simple value. All the relationship of tuples must be distinct. The key value should be used to order the tuples within a relationship. Columns are named distinctly and their ordering is not so important. 280px-Relational_Model_2.jpg Manual Database. A Manual Database is a record kept by a human without the use of any computers or electronic devices. This obviously has many problems like: Searching: It is very difficult to find a particular result from a manual database if the size of the database is huge. Updating: Updating a new entry is also problematic as we have to manually find the old record, scratch it, or erase it then make the new entry. Backing up: Suppose there is a database of 10,000 pages making a manual backup of this database, i.e. a handwritten copy of it will be difficult to make. Sorting: It is virtually impossible to sort the data say names of customers by alphabetic order, etc on a manual database. As we see that making a manual database of a large amount of data becomes impossible to manage so now we use computerized data. Traditional File Processing System One of the earliest forms of computerizing data storage is the file processing system. Creating, sorting, organizing and accessing the content of the file is known as File Processing System. Characteristics of File Processing System. Each file is different from each other. This is a collection of files, or sorted data. Each of the file is called a flat file. Every file contains processed information of a specific function such as one file may be for accounting other file may be of contacts. Files are created by the help of program which are written in C, C++ or COBOL. Drawbacks of the File Processing System. There are many drawbacks of File Processing System. Separated Data Duplicated Data Data Dependency Data inflexibility Problems in representing the data to user. File format problems. Database: A database is a organized form of data. This organization is very important because when the size of data increases it becomes difficult to use or control the data. Database Management System: A DBMS or Database Management System is a collection of data and programs which help us to access and modify those data. The collection of data is called database. The main purpose of DBMS is to efficiently store and control the database. Advantages of DBMS Control Redundancy: With the help of DBMS data redundancy can be controlled. In the File Processing System there used to be data redundancy, which means that the same data stored more than once. Integrity: Maintaining Integrity means that the data stored in the database is accurate and precise. This is very much important as incorrect data can not be stored into the database so some integrity constraints are enabled on the database, to check the accuracy of the database. Avoiding inconsistency: Consider there are two data storage sites of data and some changes are made in one site but those changes are not reflected on the other site for some reasons then it gives rise to data inconsistency. To avoid this data redundancy should be removed if data redundancy is checked it will also remove data inconsistency. Data Sharing: Suppose a same data is required by two databases then that data can be shared from a centralized database. Maintaining standards: As we know that DBMS is a centralized system so it can be standardized effectively. A company database can be standardized in Department Level, National Level, International Level, etc. Preventing unauthorized access: Lots of security can be enabled to prevent the unauthorized access of the data. Passwords and encryptions are enabled in database to provide better security to companyà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢s data. Backup and recovery of data: Data loss can happen at any moment due to number of reasons so it is very much important to create backup so that the data can be recovered if there is any accidental loss of data. Disadvantages of DBMS Complexity: The functionality of DBMS is a very complex process. The database designer, database administrator, developer and the end user should have a clear understanding of the DBMS working and functionality to make it work in a correct way. If they fail to do it DBMS will not work in a proper way. Size: As time passes the size or the volume of data increases which makes the size of database larger. Moving, copying and editing this large amount of data take a considerable time and system resource. Sometimes upgrading RAM or Disk Space becomes necessary to run the DBMS properly Performance: DBMS software tends to run slower than the typical File Processing System. Cost: Cost of implementing the DBMS is high. Sometimes the DBMS software for the specific environment is high, or the upgradeing of hardware to run it becomes costly or when converting from an older system to DBMS the process of conversion of the data costs a lot. Failure rate higher: As it is a centralized system I it fals every operation comes to a halt. Difference between File Management System and Database Management System File Management System Database Management System File management Systems are relatively small in size and volume Database Management Systems are comparatively larger in size. They are cheaper to implement Much costlier to implement It deals with few files It deals with a large number of files. The structure of this system is very simple The structure is very much complex in nature. There are many redundant data. Redundant data is very much reduced. Data inconsistency takes place in File Management System Data inconsistency is checked in the DBMS In File Management System data is isolated. In DBMS data can be shared. There is no security. It is secured. Very simple and primitive form of backup and recovery. Highly sophisticated and complex form of backup and recovery. Mainly single user. Most of the time its multiuser. Less preliminary design Vast preliminary design Purpose of DBMS Database Management System is very useful and is used in many sectors. Some the areas where it is used is given below. Railway: for making the railway enquiry and reservation system to work properly there is a needed of implementing DBMS as all the data has to be stored in a centralized location and the data is then used by every railway stations throughout the country. Banking: As now a days there are many branches of a bank there has to be a DBMS to track and record the transactions of every customers. This will have not been possible if File Management System were used. Schools/Colleges and Universities: To store the records of students like their name, roll number, address, contact number, marks obtained, etc a DBMS is used so that the database can be updated easily. Business and Offices: To store the companyà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢s sales, profit , etc and its record of employees a sophisticated DBMS is used. Instances and Schemas The database changes from time to time, the information which is stored in the database at a particular time is known as Instance. A Schema is a overall design of the database . QUESTIONS What do you mean by DBMS? A DBMS or Database Management System is a collection of data and programs which help us to access and modify those data. The collection of data is called database. The main purpose of DBMS is to efficiently store and control the database. How does DBMS differs from MS Excel? What are the differences between data and information? What is the difference between Conceptual Model and Physical Model? Conceptual Model: Conceptual Model helps to overview the organizational schema rather than the database schema. Physical Model: Physical Model is the database design which means that this model describes the data storage, data structure, etc. basically we get to know about the physical media of the data storage and the mode of access of that data from this model. What are the difference between Traditional File Management System and Database Management System? Traditional File Management System Database Management System File management Systems are relatively small in size and volume Database Management Systems are comparatively larger in size. They are cheaper to implement Much costlier to implement It deals with few files It deals with a large number of files. The structure of this system is very simple The structure is very much complex in nature. There are many redundant data. Redundant data is very much reduced. Data inconsistency takes place in File Management System Data inconsistency is checked in the DBMS In File Management System data is isolated. In DBMS data can be shared. There is no security. It is secured. Very simple and primitive form of backup and recovery. Highly sophisticated and complex form of backup and recovery. Mainly single user. Most of the time its multiuser. Less preliminary design Vast preliminary design What do you mean by Data Duplicity? Data Duplicity means repetition of the same data more than once in the same database. Data Duplicity causes lot of problems like: It is waste of time and money. It leads to loss of data integrity. It takes up additional storage and increases the size of the database which effects the search time. What do you mean by Data Dependency? In a File Processing System the specific physical format of file and record were hard coded on the application programs. So a change in database format required the codes to be updated. What is data isolation? Data Isolation means a data which is isolated form other databases that means when data can not be shared. It is not possible to share data in a File Processing System so the data remains in a isolated condition. Write down the necessary steps to secure a data into a database. What do you mean by redundant data? Data Redundancy means duplication of data. A same data may be present more than onces leading to data inconsistency. Write down the applications of Database Management System. There are many applications of Database Management System , some of them are explained below: Railway: for making the railway enquiry and reservation system to work properly there is a needed of implementing DBMS as all the data has to be stored in a centralized location and the data is then used by every railway stations throughout the country. Banking: As now a days there are many branches of a bank there has to be a DBMS to track and record the transactions of every customers. This will have not been possible if File Management System were used. Schools/Colleges and Universities: To store the records of students like their name, roll number, address, contact number, marks obtained, etc a DBMS is used so that the database can be updated easily. Business and Offices: To store the companyà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢s sales, profit , etc and its record of employees a sophisticated DBMS is used. Who are the End Users? How many types of End Users are there in DBMS? End User: The one who uses the database, it may be that he/she only views the database or it may be that he/she makes the data entries. Make queries, etc There may be different types of end user, for example : Sophisticated: these are the users who has a good knowledge in database and can make queries, with SQL manipulate data with DML (Data Manipulating Language) Specialized: who makes application programs that interacts with the database Native: only interacts with the database via some sophisticated programs

Oedipus Tyrannus Essay

Oedipus Trynnus was Sophocles masterpiece and it occupies a key place in the Greek’s mythologies and probably the most famous. This Sophocles’s piece of work is also referred to as Oedipus Rex and was performed for the time in C429Bc. It was a play that was set in Thebes, a city that had been rocked by plague. In this mythology, the mother of Oedipus committed suicide by hanging herself while his real son Oedipus self exiled himself after he learned the truth that he had married his own biological mother. Oedipus had been abandoned by his father after the oracle told him that he would suffer in the hands of his own son and for this reason he ordered him to be killed. As he was ordered, shepherd refused to kill the child and gave it to another shepherd after he was unable to raise the child himself who then gave it to a childless king of Colinth, Polybus. He was raised and brought up in his courtyard until he was fully mature. All this time he never knew that those were not his real parents but through rumors, he learned that they were not his real parents and he felt like killing the king, Polybus. He decided to consult the Oracle over this issue but it declined to tell the truth although he later established the truth. The oracle seemed to ignore his question and instead told him that he would mate with his own mother and that he would shed the blood of his own sire with his own hands. (Sophocles, Meineck P, and Woodruff P. 2000) Oedipus pretended not to be hurt and continued to believe that Merope and Polybus were his real parents. Later he contemplated of leaving Corinth for Thebes to avoid the thoughts of killing them. On his way to Thebes on his chariot, he met a man whom they disagreed over who had the right to pass first. As the quarrel ensued, due to his arrogance Oedipus killed him but this was part of the prophecy that he would kill his parents using his own hands. He was not aware that that was his biological father. This action cannot be blamed on him that he killed his own father for it was a prophecy that he would shed the blood of his own sire and so he did. What should be known is that Oedipus was just fulfilling the prophecy of the oracle although he was doing this unconsciously. At time went on, Crossby H. (1860) he managed to solve a riddle that had left many baffled. This was known as Sphinx’s riddle and the riddle was, â€Å"what walks on four legs in the morning then at noon it uses two legs and in the evening on three legs? † Sphinx never imagined that anybody would unravel the mystery and so when it was done, she threw herself off the cliff side. Although again not aware of what Oedipus did, saving the world from the curse, he opened himself another door by being made the king and in addition he was given queen Jocasta to marry. This was her real mother but he was not aware. At this juncture oracle’s prophecy could be said to have materialized although none of the key players was aware even Oedipus himself despite the fact that he had been briefed by the Oracle. Immediately after he assumed the throne (Sophocles. 2006), he was promised a Prague by the gods for the murder of Laius. For this reason, he took it upon himself to look for the killer although he was not aware that he was the murderer. In aid of the search, a blind prophet, Tiresias was approached so that he would assist in bringing the killers to book. Soon, he was given a warning not to follow the matter and was blamed by the king of killing the man. In his retaliation he told the king that he was looking for himself something that made the king to look incredulous. The king in his reaction accused Teresias of being in conspiracy with Jocasta’s brother Creon to overthrow him. (Seagal C. 2000) It should be understood that the king had no other option apart from doing that because he was obliged to do so by the oracle although he was not aware that he was fulfilling the prophecy that had been made earlier to him that he would kill his own sire using his bare hands and the same happened when he killed the man over the chariot’s passage rights. Again as it had already prophesied that he would sleep with his own mother, the same happened when he married Jocasta, the queen who was given to him after she unraveled Sphinx’s riddle something that saved Thebes’s kingdom from gods’ curse. So he was just accomplishing what was predestined to happen in his life by the Oracle. He had no power to reverse this and so he was not to be blamed for his actions. If Oedipus knew that the man whom he quarreled with was his father and that the lady that was given to him as a reward was his biological mother, he wouldn’t have done what he did and so he was innocent and should not be blamed for his actions. (Crossby H. 1860) Oedipus came to learn the naked truth when king Polybus who raised Oedipus died and a messenger who was the only witness to the murder of Lais came to Thebes to convey the message of Polybus’ death (Wilson A. 994). He had run away from Thebes because he did not want to be the one that would reveal the secret. He kept his secret and the truth came to the right when the second messenger accompanied by a shepherd told him that his real parentage was unknown. While they were still seated there, her wife told him the truth something that hurt him very m uch. The truth was that he was the kid who was abandoned by Laius after he was told by the oracle that he would bring suffering to his own father. After this, his wife ran away and committed suicide by hanging herself and when the king learned of his death from his messenger he gouged his eyes out with the golden brooches that were on Jacasta’s dress. (Hunt A. J. 1937) This left him a confused man and that was why he blinded himself so that he would never meet his father in the after world. He even decided to exile himself leaving his children in the hands of Jocanta’s brother, care. At first he insisted to have the company of the children but Creon refused. In short though unaware, all his actions were predetermined and he was just doing what was in the Oracle’s design.

Topics for Cause and Effect Essay: the Ultimate Convenience!

Topics for Cause and Effect Essay: the Ultimate Convenience! Topics for Cause and Effect Essay - What Is It? So when you've been assigned to compose a cause and effect essay, you have to develop an excellent topic. Cause and effect essay have many sub-types. More often you'll need to select your own cause and effect essay topic. Obviously, the topic you pick for cause and effect essay is going to be the guiding principle in the whole work. Others might point to the concept which people are ready to pay for prostitutes. Certainly, if you're totally free to decide on the topic you like it is going to turn into something attractive and cognitive. The world has an extensive and extraordinary history, so you are able to write about anything you want! Everything on earth is interrelated. The Death of Topics for Cause and Effect Essay Once more, based on the content you've got to provide, the essay needs to be organized to suit your information efficiently and neatly. There are many kinds of signal words that can be utilised in this kind of essay. Every topic was assigned by the experts and that is the reason why easy to find the resources online for research. As you conduct research on all probable topics, take notes. The sole difference is you don't will need to put page numbers when it has to do with the outline sections. Interestingly many are taught just in class. There are topics which include numerous effects due to a single reason. As a result, if you lack absolutely free time, but prefer to get a first-rate evaluation of the essays we supply a simple solution refer to our list of sample topics to locate what you need among our examples. Kibin editors are content to help review your paper. The group of skilled essay writers is always prepared to assist you with that in no moment! There are a lot of varieties of essays there in the world you can merely lose your head. No particular statistics is crucial for a thesis statement. The title which you choose to utilize for your paper will always determine so much about any of this, so considerably more than you may even know about. Try to remember that choosing cause and effect essay topics, along with writing the paper, can be a difficult undertaking however, you can always rely on our business and we'll complete it in the ideal approach. Introducing Topics for Cause and Effect Essay In the event you are in need of a cause and effect essay help don't hesitate to get in touch with our support team for extra guidance. Cause and effect is a typical way of organizing and discussing ideas. Concerning society, in addition, there are detrimental consequences. There are different kinds of cause and effect that someone may take into account. What the In-Crowd Won't Tell You About Topics for Cause and Effect Essay When you wish to create a wonderful cause and effect essay for college, acquiring an engaging topic you should know you could have fun too! Making logical conclusions is highly connected with high analytical skills on the area of the student. You might believe that political and socioeconomic topics are excessively dull for you, but your professor is going to be impressed with this kind of research. Students should focus on the way things relate to one another. Our professional writers are glad to help you with any cause and effect project that you want to get written. Therefore, brainstorming is crucial. Visualizing things is a strong method. If your favorite topic is Climate change then begin analyzing the topic with respect to effects and causes. The cause and effect essay mainly includes the discussion regarding the reason for the occurrence of a specific thing together with the impact of occurrence of the exact same. Cause and effect essays are among the simplest to write. In a brief essay, it may be hard to tackle the reason and all the many effects of a huge event like the Great Depression. You may be angry or frustrated, but there might be long-term effects too, like a potential increase in blood pressure.

King Lear Nature Essay - 1976 Words

Throughout â€Å"King Lear† nature is holds different meanings that have major significance to the theme of the play. Characters speak to it as though it’s a personified entity; they refer to the celestial objects in the heavens above and even to that of animals of the Earth. When the characters speak to nature, they do it as a means of justifying their intentions or previous actions, and also as a means of invoking it in some form. Nature is also used to describe the disposition of a character and the physical world with no spiritual bearing. We see that nature tends to hold many ambiguous meanings during the play; however they are centered mostly between nature that embodies the laws of the universe or that of a man. One instance of the†¦show more content†¦He does so in the first scene of Act 1 where he asks for his daughters to profess their love for him in order to take a share of the kingdom. When he is met by Cordelia’s explanation of how she only loves him â€Å"according to her bond, no more† he enters a fit of rage and casts her out while also including nature in his speech. â€Å"The sacred radiance of the sun, the mysteries of Hecate and the night by all the operations of the orbs† and â€Å"I hereby disclaim all my paternal care, propinquity and property of blood† is a clear example of how he attempts to invoke the stars above as a power against his once beloved daughter. Lear repudiates nature when he casts out Cordelia, his very own â€Å"natural† daughter, and yet attempts still to call upon it even though he contradicts it. Now although Lear and Edmund both share this view of the stars, they don’t perceive the natural in the same ways. Lear resembles the â€Å"divine king† or the â€Å"master of nature† as the early monarchs of those times saw themselves as did the people in the lower portions of the hierarchy. When Lear is cast out by his daughter Goneril for his be havior along with his servants, he exclaims â€Å"Hear Nature, hear! Dear goddess, hear!† and proceeds to order nature to make Goneril sterile and have no â€Å"babe to honour her†. When doing so he says that if it shall be born it will be â€Å"of spleen† and â€Å"disnatured† meaning non-filial and obstinate. Lear then shows a belief that his children he has created from theShow MoreRelatedThe Nature of King Lear Essay769 Words   |  4 PagesThe most prevailing images in King Lear are the images (metaphoric and actual) of nature. The concept of nature seems to consume the dialogue, monologues, and setting. It might be useful to view nature as `the natural order of the world (and, perhaps, the universe). When one goes against the natural order, chaos will follow. Shakespeare has made this point clear in Troilus and Cressida where Ulysses predicts that once the specialty of rule hath been neglected disaster will follow, for takeRead MoreKing Lear Nature Essay1591 Words   |  7 PagesThe concept of Nature has become layered with many complexities due to the numerous ways this word can be interpreted. It could mean anything from â€Å"the inherent character or basic constitution of a person or thing† to â€Å"the external world in its entirety† to â€Å"a spontaneous attitude† (Merriam Webster). However, despite its many forms, the common bond between all forms of nature is it’s power over individuals. 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We see this mostly with Kent, Lear’s faithful servantRead MoreDisruption of Order in King Lear and the Causes1416 Words   |  6 Pages[kingdom] in chaos (Bartelby.com). In Shakespeares tragic play, King Lear, the audience witnesses to the devastation of a great kingdom. Disorder engulfs the land once Lear transfers his power to his daughters, but as the great American writer, A.C. Bradley said, The ultimate power in the tragic world is a moral order (Shakespearean Tragedy). By examining the concept of order versus disorder in the setting, plot, and the character King Lear, Bradleys idea of moral order is clearly demonstrated by theRead More Comapring Father/Daughter Relationships in King Lear and A Thousand Acres1129 Words   |  5 PagesFather/Daughter Relationships in King Lear and A Thousand Acres   Ã‚  Ã‚   The bond between a father and a daughter stands as one of the strongest emotional bonds present within many families. From the moment their little girls emerge from the womb to the moment their young women marry, the father reigns as the head of the household, the controller, and the protector. Though this rings true for many families, sometimes Daddys little girls make all the rules. They possess the ability to acquire whatRead MoreKing Lear, by Shakespeare Essay994 Words   |  4 Pageskill you makes you stronger,† and Shakespeare himself seems to agree with this old adage. In his tragedy King Lear he has many of his main characters go through an experience that takes them far out of their comfort zone to change them for the better. Throughout King Lear Shakespeare shows that man cannot be morally strong without over coming suffering. At the beginning of the play King Lear is an old, foolish man. He is blind to the traitors all around him. Although he physically can see, he isRead More traglear King Lear as an Arthur Miller Tragedy Essay1193 Words   |  5 PagesKing Lear as an Arthur Miller Tragedy        Ã‚  Ã‚   If we seek to justify Shakespeares King Lear as a tragedy by applying Arthur Millers theory of tragedy and the tragic hero, then we might find Lear is not a great tragedy, and the character Lear is hardly passable for a tragic hero. However, if we take Aristotles theory of tragedy to examine this play, it would fit much more neatly and easily. This is not because Aristotle prescribes using nobility for the subject of a tragedy, but, more importantlyRead MoreEssay Comparing The Tempest and King Lear1338 Words   |  6 PagesComparing The Tempest and King Lear      Ã‚  Ã‚   This essay will focus on the similarities and differences of the plays The Tempest and King Lear in general, as well as looking at comparisons of Prospero and Lear in somewhat more detail. Prospero and Lear are, without a doubt, the two most compelling mature figures in Shakespeare. In a way, one is the flip side, so to speak, of the other. Each represents an aging mans relationship to family, environment, and, most importantly, himself. One might