If the state of a database no longer reflects a real life state the database is supposed to capture, then such a database state is said to be A Consistent B Durable C Parallel D Inconsistent.
Q: QUESTION 5 The second readers-writers problem requires that, Readers and writers could access the…
A: Second readers-writers problem is... Reader wait until no active ot waiting writers…
Q: It allows a physically dispersed database to manage as though it were a centralized database O…
A: Answer :
Q: In a normal database context, there should be at least nine unique subjects to address.
A: Introduction: The DBMS software works as a wrapper around the database, storing, reading, and…
Q: Atuple in a database is: A A field. A record, An entity. A relation C D
A: A tuple is a row also known as one record stored in table.
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A: Intro Banks safeguard their data: Banks must first reevaluate their existing back-office and…
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A: Here is the Answer and Explanation
Q: at is the difference between centralized and parallevdistributed database
A: Lets see the solution.
Q: Write a schema for an operation to remove a person from the database.
A: In a relational database, we use the schema design technique Normalizations and split the large…
Q: A database is in 3rd NF if A. It is 2ndNF and in 1stNF B. It is in 2ndNF and all non-key fields…
A: Given: A database is in 3rd NF if A. It is 2ndNF and in 1stNF B. It is in 2ndNF and all non-key…
Q: 4) The mismatch between the data structures stored in the database and the organization of…
A: Impedance mismatch is a term used to refer to problems that occur due to differences between the…
Q: Does the fact that a database satisfies the requirements for entity and referential integrity…
A: Does the fact that a database satisfies the requirements for entity and referential integrity…
Q: Show clearly all working explaining detailly each step
A: We need to choose the correct option for the statement- "a top to bottom relationship among the…
Q: Construct a Relational Database Schema using this
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Q: An advantage of the database management approach is O a. data is integrated and can be accessed by…
A: Database is a collection of data which are inter-related. A database makes it easy to access,…
Q: Justify why block allocation has a significant influence on the database system's performance.
A: Answer : Block allocation means block is fill or allocated with some data in the database which…
Q: A top-to-bottom relationship among the items in a database is established by a: A Hierarchical…
A: A hierarchical database model is a data model in which the data are organized into a tree-like…
Q: Student(studentNumber, StudentName, studentAddress) Book(bookNumber, bookTitle, #authorNumber,…
A: The relational algebra for the given query is as follows,
Q: a database that tracks students and their majors. Students may have multiple majors and students…
A: Below is the required ER diagram:
Q: In a database, there are values a data element can take, and there are values it cannot take. In…
A: The answers are given in below sections for each with explanation .
Q: A top-to-bottom relationship among the items in a database is established by a
A: Given: A top-to-bottom relationship among the items in a database is established by a
Q: Consider the following relational database schema: • Movies (title, year, length, studioName) A…
A: (a) SELECT title, year FROM Stars WHERE Stars.starName=Stars.starName (b) SELECT COUNT(title) as…
Q: List two benefits and two drawbacks of each of the following methods for storing a relational…
A: The recommended storage approach is to keep each relationship in its own file. The following are…
Q: If the state of the database no longer reflects a real state of the world that the database is…
A: Please find the answer below
Q: Explain why block allocation has a significant impact on the database system's performance.
A: Given: This query speaks to a significant effect on the database system's performance. One strategy…
Q: Consider a database system for a bank that employs snapshot isolation. Describe a specific situation…
A: Database: An database is a collection of information that is stored in a database. The data is…
Q: If the state of the database no longer real state of the world that the database is supposed to…
A: In this problem, we are going to discuss about the database state in the given scenario.
Q: Numerous advantages exist for using a hierarchical database over a relational database. Discuss if…
A: Given: There are numerous benefits to using a hierarchical database rather than a relational…
Q: Assume two students wish to enrol in the same course, but there is only space for one additional.…
A: Intro in the database, we have a concept of locks where when we try to update a record we need to…
Q: Mạp the following EER Design into a relational database. Specify primary key and referential…
A: There are some steps of converting the EER design to the relational database:
Q: No matter how "exclusive" a lock on changes the primary (master) database has, this may still…
A: Replication inside the database: The practice of transferring data from a central database to…
Q: Transform the ERD below to a database design. Identify the primary keys and foreign keys. Answer…
A: Solution :: Business rules refer to types of constraints that are present among different…
Q: Each of the following methods for storing a relational database has two benefits and two drawbacks.…
A: Relational database : A relational database is a collection of data components connected by…
Q: Explain what can be done with primary keys to eliminate key ripple effects as a database evolves.
A: Eliminating key ripple effects: A ripple effect is caused when the primary key of a relation is…
Q: A top-to-bottom relationship forms a link between the components in a database.
A: The term "relationship" usually refers to: Consanguinity is are term used to describe the…
Q: Student(student Number, StudentName, studentAddress) Book(bookNumber, bookTitle, #authorNumber,…
A: The relational algebra for the given query is as follows,
Q: The log is a sequence of ___________, recording all the update activities in the database. a. Log…
A: Explanation: The most widely used structure for recording database modifications is the log.
Q: Can an error in a database system be considered more severe than one that happens elsewhere?
A: Introduction: Minor database mistakes may be helpful to an attacker, letting them know exactly what…
Q: Select from below ALL statements that are true. Select one or more: a. Adding locking and…
A: Answer and explanation is provided in the following steps.
Q: Consider the following scenario: two students are attempting to enrol for a course in which there is…
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Q: mistake occurs in the database system, is it more serious than an error that
A: Here have to determine about error in database system.
Q: A data model is: A Used to describe structure of a database. B Set of basic operations on the…
A: Data models define how the logical structure of a database is modeled. The data model is a…
Q: Database Systems Question 4. A relation R is given which is R(A,B,C,D,E,F). It has the following…
A: We have given a relation R (A,B,C,D,E,F) and functional dependencies: AB -> CDE, B -> F. We…
Q: Consider the following schema for a company database and answer the following questions: DEPARTMENT…
A: CREATE statement is used to create any table in the database. The language to create the data base…
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Q: a. characteristic and benefit of database is discussed in the scenario. b. and are the methods…
A: Data Base Recovery Database recovery is the characteristic and the benefit of database that has been…
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- To access a database, we need to open a connection to it first and close it once our job is done. Connecting to a database depends on the type of the target database and the database management system (DBMS). For example, connecting to a SQL Server database is different from connecting to an Oracle database. But both these connections have a few things in common: •They have a connection string •They can be opened•They can be closed•They may have a timeout attribute (so if the connection could not be opened within the timeout, an exception will be thrown).Your job is to represent these commonalities in a base class called DbConnection. This class should have two properties: ConnectionString : stringTimeout : TimeSpanA DbConnection will not be in a valid state if it doesn’t have a connection string. So you need to pass a connection string in the constructor of this class. Also, take into account the scenarios where null or an empty string is sent as the connection string. Make sure to…Another action may be triggered by the execution of a trigger. There is often a limit on how deep nesting may go in database systems. Why could they impose such a restriction?The database interface of a library allows searching only for a single attribute (such as „Title. or Author.) in each query. Your friend decided to extend it's functionality and wrote an algorithm that allows searching for books that satisfy multiple predicates over single attributes in conjunction. He tells you the algorithm reuses the already implemented query functionality and works by intersecting the results (_book id's.) of queries over single attributes. Which of the following assumptions on your friend's algorithm are plausible? a) Its worst-case run-time necessarily increases exponentially with respect to the number of attributes in the query. b) Its worst-case run-time depends on the length of the longest result of the single-attribute queries. c) It might be implemented using an join. d) It might be implemented using sorting.
- The database interface of a library allows searching only for a single attribute (such as Title or Author ) in each query. Your friend decided to extend it’s functionality and wrote an algorithm that allows searching for books that satisfy multiple predicates over single attributes in conjunction. He tells you the algorithm reuses the already implemented query functionality and works by intersecting the results ( book id’s ) of queries over single attributes.Which of the following assumptions on your friend’s algorithm are plausible?a) Its worst-case run-time necessarily increases exponentially with respect to the number of attributes in the query.b) Its worst-case run-time depends on the length of the longest result of the single-attribute queries.c) It might be implemented using an join.d) It might be implemented using sorting.That's possible even if the master database has a "exclusive lock" on modifications. Data inconsistencies may occur in the database even if a "exclusive lock" is obtained for modifications if information is retrieved from a node other than the master.Suppose you are asked to design a club database system based on the following information. Each student has a unique student id, a name, and an email; each club has a unique club id, a name, a contact telephone number, and has exactly one student as its president. Each student can serve as a president in at most one of the clubs, although he/she can be the members of several clubs. Clubs organize activities and students can participate in any of them. Each activity is described by a unique activity id, a place, a date, a time and those clubs that organize it. If an activity is organized by more than one club, different clubs might contribute different activity fees.QuestionDraw an E-R diagram for the system according to the above description.
- It is possible for this to take place even when the primary database (the master) maintains a "exclusive lock" on modifications. Even if the database is given a "exclusive lock" on the modifications, the database might still be inconsistent if data is retrieved from a different node rather than the master.A database is in 3rd NF if A. It is 2ndNF and in 1stNF B. It is in 2ndNF and all non-key fields depend on all key fields C. It is in 2nd NF and all non-key fields depend only on one key field D. It is in 2ndNF and all non-key fields may depend indirectly on all key fields Justify your answer with explanationsConsider the following database schema for University Library database. A student can borrow many books and a given book can be borrowed by any student if it is available in the library. For each borrowing, the borrowing and return dates are registered in the database. Student (SID: long, CPR:long (unique), Name:string, tel:number, major:String, gender:Character {'F' or 'M'}) Book (ISBN:long Title:string (unique), Author:string) BorrowedItems(stSID:long, book|SBN:long, serialNo:int (unique), BorrowingDate:date, ReturnDate:date) Write SQL statements to: 1. List ISBN, Title, Author of all books that include the word 'Database' in their titles in a descending order of ISBN. 2. List SID, Name, and Major of all female students doing major in CS'and their name starts with 'S'. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).
- Suppose you are given the following business rules to form the basis for a database design. The database must enable the manager of a company dinner club to mail invitations to the club’s members, to plan the meals, to keep track of who attends the dinners, and so on. Each dinner serves many members, and each member may attend many dinners. A member receives many invitations, and each invitation is mailed to many members. A dinner is based on a single entree, but an entree may be used as the basis for many dinners. For example, a dinner may be composed of a fish entree, rice, and corn. Or the dinner may be composed of a fish entree, a baked potato, and string beans. A member may attend many dinners, and each dinner may be attended by many members. Because the manager is not a database expert, the first attempt at creating the database uses the structure shown in Table I: Table I Sample RESERVATION Records Attribute Name Sample Value Sample Value Sample Value…Suppose you are given the following business rules to form the basis for a database design. The database must enable the manager of a company dinner club to mail invitations to the club's members, to plan the meals, to keep track of who attends the dinners, and so on. Each dinner serves many members, and each member may attend many dinners. A member receives many invitations, and each invitation is mailed to many members. A dinner is based on a single entree, but an entree may be used as the basis for many dinners. For example, a dinner may be composed of a fish entree, rice, and corn, or the dinner may be composed of a fish entree, a baked potato, and string beans. Because the manager is not a database expert, the first attempt at creating the database uses the structure shown in Table P6.7.a. Given the table structure illustrated in Table P6.7, write the relational schema and draw its dependency diagram. Label all transitive and/or partial dependencies. (Hint: This structure uses a…This may happen notwithstanding any "exclusive lock" on modifications made to the primary (master) database. It's possible for database inconsistencies to occur even if a "exclusive lock" is obtained for modifications if data is retrieved from a node other than the master.