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Although the primary (master) copy had an exclusive lock, the
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- A database has been designed to display a list of popular movies and also a list of actors acting in these movies. The relationship that would exist between the related tables would be: O many to many one to many O many to one O one to oneNeed a c++ program to connect to this database and perform add, search, remove, display operations. -- students create table students ( student_id int, name varchar(50), dob date, phone int, email varchar(50), address text, year_level int, section varchar(2), primary key(student_id) ); -- staff create table staff(staff_id int,name varchar(50),address text,phone int, email varchar(50),position varchar(20),salary int,primary key(staff_id) ); -- book_subject create table( subject_id int primary key, subject varchar(50)); -- books create table books( book_id int,title varchar(50),published_year int,isbn int,cost int, subject_id int, primary key(book_id),foreign key(subject_id) references book_subject(subject_id) ); -- book_issue create table book_issue( issue_id int, issue_date date, staff_id intjumb, student_id int, book_id int, return_date da primary key(issue_id), foreign key(staff_id) references…2. DEL Transactions: The following transaction schedule is given. A,B,C are the addresses of the records in the database and T1, T2 and T3 are the transactions. T1 R(A)W(A) R(C) R(B)W(B)C T2 T3 R(B) W(B) R(C) R(B)W(B) R(A) с a) Show an example of a strict 2PL implementation that leads to a deadlock b) For a) draw a >>wait-for<< graph c) Avoid the previously drawn deadlock with a wait-die<< policy d) Give an example of another schedule that would be conflict-equivalent to the given schedule of transactions W(A)C
- 2. CHAPTER TRANSACTION MANAGEMENT Consider the case of immediate database approach and assume that, after a crash, the log contains the following records: Transaction Object Old Value New Value LSN L001 T1 (starts) P. 400 500 LO02 T1 300 400 LO03 T1 L004 T2 (starts) LO05 T1( commits) LO06 T3 (starts) R. 100 200 LO07 T2 700 800 LO08 T3 LO09 T4 (starts) L010 T3 (commits) T4 T. 800 900 L011 i) Which transaction(s) will be redone during recovery process? ii) Which transaction(s) will be undone during recovery process? ii) What will be the value of data item 'P' and 'T' after the recovery?You should definitely start with a database that is run by an airline and makes use of "snapshot isolation" if you want to get the most out of this example. What if the improved overall performance of the airline was caused by a non-serializable execution rather than a serializable execution?10 The resulting list for each object consists of ordered pairs , which define all domains with a nonempty set of access rights for that object. This statement is TRUE with respect to which of the following methods of access matrix implementation. Global Table Access list for objects Capability list for domains lock-key scheme
- CSC 472 Introduction to Database Systems Project Consider the contents of output tuples generated by a join operator. The advantage of "late materialization" approach is that future operators in the query plan never need to go back to the base tables to get more data. Group of answer choices True FalseA taxi company would like to provide an online service for customers to book a trip and for taxi drivers to check their upcoming trips. A database needs to be created to store customer data (name, address, email, telephone number) and trip information (pick up and drop off address and pick up time and date). Furthermore, your database should contain driver information (name and license plate). Each trip must be assigned to exactly one driver (and trips for a driver must not overlap). Customers who are not registered yet need to register (providing their address, phone number, email address, and credit card information). A registered customer should be able to book a trip, i.e. provide the pick-up address and time as well as the drop-off address via a graphical user interface. Customers should also be able to view their trips and cancel them if needed. All these operations are only possible after a customer signs in (which means they must be registered). Each new trip must be confirmed…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…
- A student database may include indexes on fields such as major, age, marital status, and home zip code in addition to the main key, which is the student's unique identifier (all secondary keys). Let's assume the school wants a list of MIS or CS majors over the age of 25 who are married and from the 45462 zip code OR a list of CS majors under the age of 25 who are single and from the 45462 the code. Is there a way to utilize indexes to restrict access to just the records that meet this criterion?3. Index records comprise search-key values and data pointers. Multilevel index is stored on the disk along with the actual database files. As the size of the database grows, so does the size of the indices. If single-level index is used, then a large size index cannot be kept in memory which leads to multiple disk accesses. Multi-level Index helps in breaking down the index into several smaller indices in order to make the outermost level so small that it can be saved in a single disk block, which can easily be accommodated anywhere in the main memory. Why is there an immense need to keep the index records in the main memory?What is the Big O categorization of the execution time for constructing the database? Of a single insertion? Of a single removal? Of a single add? Of a single search?
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