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Database Systems
1. List the ACID properties. Explain the usefulness of each.
2. Consider the following two transactions: T13: read(A);read(B);if A = 0 then B := B + 1;write(B).T14: read(B);read(A);if B = 0 then A := A + 1;write(A).Let the consistency requirement be A = 0 or B = 0, with A = 0 and B = 0 as the initial values.a. Show that every serial execution involving these two transactions preserves the consistency of the database.b. Show a concurrent execution of T13 and T14 that produces a nonserializable schedule.c. Is there a concurrent execution of T13 and T14 that produces a serializable schedule?
3. What is the two-phase locking protocol? What is the strict two-phase locking protocol? What is the rigorous two-phase locking protocol? What benefit does strict two-phase locking protocol provide? What benefit does rigorous two-phase locking protocol provide?
4. Consider the log in Figure. Suppose there is a crash just before the <T0 abort> log record is written out. Explain what would happen during recovery.
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Suppose you are asked to evaluate a DBMS in terms of lock granularity and the different locking levels. Create a simple database environment in which these features would be important.
Need a system that networks its 3 campuses in the US and one campus in Singapore. Transaction data for all campuses should be available to all locations. In addition, students should be able to use the Internet to view classes, enroll, register, and ..
Consider the EER diagram for a car dealer in the figure below. Map the EER schema into a set of relations.
A screen shot of the first page of the contents of each table. Alternatively, you may create a report that dumps the contents of a table and submit a single page of that report.
Consider the UNIVERSITY database described in Exercise Build the ER schema for this database using a data modeling tool such as ERwin or Rational Rose.
Design a Database schema
For each table argue whether or not interference with another transaction is possible. Illustrate concurrency control method using two phase locking.
When increasing cardinalities from 1:N to N:M, which of the given steps are included in process the order of steps listed below is not relevant, only steps themselves?
Prepare a Systems Proposal that includes an executive summary and a problem statement. Refer to the guidelines and recommended format for the systems proposal.
Analyse the Case Study documents and produce an initial high level functional requirements specification. Document these requirements with.
create an entity-relationship diagram and design accompanying table layout using sound relational modeling practices
You will find an abundance of materials on this subject within the databases located within IEEE & ACM digital libraries. But don't forget that especially in the Networking technologies RFC's and other related standards are the most authoritative ..
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