2007 server‚ there are always two copies of each change to the database: the change written to the page (or series of pages) in RAM‚ and the log record of those changes in the transaction logs. If the information is lost in RAM‚ if it has been written to a transaction log‚ it can be recovered and written to the database. This graph shows the types of backups and its effects on the files/transaction logs. Type Copies
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Normalization Normalization is a method for organizing data elements in a database into tables. Normalization Avoids • Duplication of Data – The same data is listed in multiple lines of the database • Insert Anomaly – A record about an entity cannot be inserted into the table without first inserting information about another entity – Cannot enter a customer without a sales order • Delete Anomaly – A record cannot be deleted without deleting a record about a related entity.
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of the database applications. 2. What is the role of the database in the IS generic architecture? 3. What is file-based system? Give 2 examples of FBS. 4. What are main limitations of FBS? 5. What is database? 6. What does it mean that database is self-describing collection of interrelated records? 7. What does it mean that data is integrated? 8. What does it mean that database is collection of logically related data? 9. What is DBMS? 10. What are the main categories of database languages
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Although‚ data is separated into different and more complex tables during normalization‚ the process of normalizing a database can help to organize data more efficiently by minimizing redundancy and providing more accurate records. During the process‚ column and field names are consolidated into more specific ones to avoid repetition of data. In many cases‚ tables are divided into two or more tables and linked via a relationship using their Primary Keys and/or Foreign Keys. The main goal is to
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NORMALIZATION OF DATABASE NORMALIZATION- is the process for evaluating and correcting table structures to minimize data redundancies‚ thereby‚ reducing the livelihood of data anomalies. The normalization process involves assigning attributes to tables based on the concept of determination. Normalization works through a series of stages called normal forms. 3 Stages of Normalization 1. 1NF or FIRST NORMALIZATION FORM 2. 2NF or SECOND NORMALIZATION FORM 3. 3NF or THIRED NORMALIZATION
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Relaional Database Management Questions Planning for backup and recovery of database information is done by _________________ A.Data Assurance team B.Data management C.DBA D.Data-Query Reset Selection Question 2 of 10 10.0 Points Please choose the functions of a Database? A. Data Definition and Manipulation B. Data Recovery and consistency C. Performance of Queries D. Data Dictionary Maintenance A.A‚ B‚ C and D B.A‚ C and D C.B‚ C and D D.A‚ B and C
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PubMed and Google Scholar are two different databases used for searching articles on online. PubMed are mostly used for biomedical and clinical journals. The data information are organized based on the date‚ author‚ tittle and type of article. This made it easier to search and retrieve journal articles faster. PubMed have an advance function like MeSH term subheading but Google scholar lack MeSH function (Jean-François‚ Laetitia‚ & Stefan‚ 2013). Also‚ the content of the articles on PubMed are
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- 1 - Database Security *) GÜNTHER PERNUL Institut für Angewandte Informatik und Informationssysteme Abteilung für Information Engineering Universität Wien Vienna‚ Austria 1. Introduction 1.1 The Relational Data Model Revisited 1.2 The Vocabulary of Security and Major DB Security Threats 2. Database Security Models 2.1 Discretionary Security Models 2.2 Mandatory Security Models 2.3 Adapted Mandatory Access Control Model 2.4 Personal Knowledge Approach 2.5 Clark and Wilson Model 2
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Normalization A logical design method which minimizes data redundancy and reduces design flaws. Consists of applying various “normal” forms to the database design. The normal forms break down large tables into smaller subsets. First Normal Form (1NF) Each attribute must be atomic • No repeating columns within a row. • No multi-valued columns. 1NF simplifies attributes • Queries become easier.
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Institution Database Software The acquisition of database software for business information management is a source of business leverage in the ever competitive business environment. The management of business information is made possible by the acquisition of efficient database software. Database software is the term that refers to the computer program that helps to enter‚ update‚ organize‚ retrieve‚ and report information held in a computer database. Among the commonly used database software for
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