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database management systems solutions manual fourth edition

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I hope that most of the questions in this book deserve an answer. The set of questions is unusually extensive, and is designed to reinforce and deepen students understanding of the concepts covered in each chapter. There is a strong emphasis on quantitative and problem-solving type exercises. While I wrote some of the solutions myself, most were written originally by students in the database classes at Wisconsin. I d like to thank the many students who helped in developing and checking the solutions to the exercises; this manual would not be available without their contributions. Several students contributed to each chapter s solutions, and answers were subsequently checked by me and by other students. This manual has been in use for several semesters. I hope that it is now mostly accurate, but I m sure it still contains errors and omissions. If you are a student and you do not understand a particular solution, contact your instructor; it may be that you are missing something, but it may also be that the solution is incorrect. If you discover a bug, please send me mail and I will update the manual promptly. The latest version of this solutions manual is distributed freely through the Web; go to the home page mentioned below to obtain a copy. For More Information The home page for this book is at URL: iii This page also contains a link to all known errors in the book, the accompanying slides, and the software. Since the solutions manual is distributed electronically, all known errors are immediately fixed and no list of errors is maintained. Instructors are advised to visit this site periodically; they can also register at this site to be notified of important changes by. When would it make sense not to use a database system? Answer 1.1 A database is an integrated collection of data, usually so large that it has to be stored on secondary storage devices such as disks or tapes.

This data can be maintained as a collection of operating system files, or stored in a DBMS (database management system). The advantages of using a DBMS are: Data independence and efficient access. Database application programs are independent of the details of data representation and storage. The conceptual and external schemas provide independence from physical storage decisions and logical design decisions respectively. In addition, a DBMS provides efficient storage and retrieval mechanisms, including support for very large files, index structures and query optimization. Reduced application development time. Since the DBMS provides several important functions required by applications, such as concurrency control and crash recovery, high level query facilities, etc., only application-specific code needs to be written. Even this is facilitated by suites of application development tools available from vendors for many database management systems. Data integrity and security. The view mechanism and the authorization facilities of a DBMS provide a powerful access control mechanism. Further, updates to the data that violate the semantics of the data can be detected and rejected by the DBMS if users specify the appropriate integrity constraints. Data administration. By providing a common umbrella for a large collection of data that is shared by several users, a DBMS facilitates maintenance and data administration tasks. A good DBA can effectively shield end-users from the chores of fine-tuning the data representation, periodic back-ups etc. 1 A DBMS supports the notion of a transaction, which is conceptually a single user s sequential program. Users can write transactions as if their programs were running in isolation against the database. The DBMS executes the actions of transactions in an interleaved fashion to obtain good performance, but schedules them in such a way as to ensure that conflicting operations are not permitted to proceed concurrently.

Further, the DBMS maintains a continuous log of the changes to the data, and if there is a system crash, it can restore the database to a transaction-consistent state. That is, the actions of incomplete transactions are undone, so that the database state reflects only the actions of completed transactions. Thus, if each complete transaction, executing alone, maintains the consistency criteria, then the database state after recovery from a crash is consistent. If these advantages are not important for the application at hand, using a collection of files may be a better solution because of the increased cost and overhead of purchasing and maintaining a DBMS. Exercise 1.2 What is logical data independence and why is it important? Answer 1.2 Logical data independence means that users are shielded from changes in the logical structure of the data, i.e., changes in the choice of relations to be stored. For example, if a relation Students(sid, sname, gpa) is replaced by Studentnames(sid, sname) and Studentgpas(sid, gpa) for some reason, application programs that operate on the Students relation can be shielded from this change by defining a view Students(sid, sname, gpa) (as the natural join of Studentnames and Studentgpas). Thus, application programs that refer to Students need not be changed when the relation Students is replaced by the other two relations. The only change is that instead of storing Students tuples, these tuples are computed as needed by using the view definition; this is transparent to the application program. Exercise 1.3 Explain the difference between logical and physical data independence. Answer 1.3 Logical data independence means that users are shielded from changes in the logical structure of the data, while physical data independence insulates users from changes in the physical storage of the data. We saw an example of logical data independence in the answer to Exercise 1.2.

Consider the Students relation from that example (and now assume that it is not replaced by the two smaller relations). We could choose to store Students tuples in a heap file, with a clustered index on the sname field. Alternatively, we could choose to store it with an index on the gpa field, or to create indexes on both fields, or to store it as a file sorted by gpa. These storage alternatives are not visible to users, except in terms of improved performance, since they simply see a relation as a set of tuples. This is what is meant by physical data independence. How are these different schema layers related to the concepts of logical and physical data independence? Answer 1.4 External schemas allows data access to be customized (and authorized) at the level of individual users or groups of users. Conceptual (logical) schemas describes all the data that is actually stored in the database. While there are several views for a given database, there is exactly one conceptual schema to all users. Internal (physical) schemas summarize how the relations described in the conceptual schema are actually stored on disk (or other physical media). External schemas provide logical data independence, while conceptual schemas offer physical data independence. Exercise 1.5 What are the responsibilities of a DBA. If we assume that the DBA is never interested in running his or her own queries, does the DBA still need to understand query optimization. Why? Answer 1.5 The DBA is responsible for: Designing the logical and physical schemas, as well as widely-used portions of the external schema. Security and authorization. Data availability and recovery from failures. Database tuning: The DBA is responsible for evolving the database, in particular the conceptual and physical schemas, to ensure adequate performance as user requirements change.

Unless the DBA understands the performance needs of widely used queries, and how the DBMS will optimize and execute these queries, good design and tuning decisions cannot be made. Exercise 1.6 Scrooge McNugget wants to store information (names, addresses, descriptions of embarrassing moments, etc.) about the many ducks on his payroll. Not surprisingly, the volume of data compels him to buy a database system. To save money, he wants to buy one with the fewest possible features, and he plans to run it as a stand-alone application on his PC clone. Of course, Scrooge does not plan to share his list with anyone. Indicate which of the following DBMS features Scrooge should pay for; in each case, also indicate why Scrooge should (or should not) pay for that feature in the system he buys. A security facility is necessary because Scrooge does not plan to share his list with anyone else. Even though he is running it on his stand-alone PC, a rival duckster could break in and attempt to query his database. The database s security features would foil the intruder. Concurrency control is not needed because only he uses the database. Crash recovery is essential for any database; Scrooge would not want to lose his data if the power was interrupted while he was using the system. A view mechanism is needed. Scrooge could use this to develop custom screens that he could conveniently bring up without writing long queries repeatedly. A query language is necessary since Scrooge must be able to analyze the dark secrets of his victims. In particular, the query language is also used to define views. Exercise 1.7 Which of the following plays an important role in representing information about the real world in a database. Explain briefly. 1. The data definition language. 2. The data manipulation language. 3. The buffer manager. 4. The data model. Answer 1.7 Let us discuss the choices in turn.

The data definition language is important in representing information because it is used to describe external and logical schemas. The data model is fundamental to representing information. The data model determines what data representation mechanisms are supported by the DBMS. The data definition language is just the specific set of language constructs available to describe an actual application s data in terms of the data model. Exercise 1.8 Describe the structure of a DBMS. If your operating system is upgraded to support some new functions on OS files (e.g., the ability to force some sequence of bytes to disk), which layer(s) of the DBMS would you have to rewrite to take advantage of these new functions? Answer 1.8 The architecture of a relational DBMS typically consists of a layer that manages space on disk, a layer that manages available main memory and brings disk pages into memory as needed, a layer that supports the abstractions of files and index structures, a layer that implements relational operators, and a layer that parses and optimizes queries and produces an execution plan in terms of relational operators. In addition, there is support for concurrency control and recovery, which interacts with the buffer management and access method layers. The disk space management layer has to be rewritten to take advantage of the new functions on OS files. It is likely that the buffer management layer will also be affected. Exercise 1.9 Answer the following questions: 1. What is a transaction? 2. Why does a DBMS interleave the actions of different transactions instead of executing transactions one after the other? 3. What must a user guarantee with respect to a transaction and database consistency. What should a DBMS guarantee with respect to concurrent execution of several transactions and database consistency? 4. Explain the strict two-phase locking protocol. 5. What is the WAL property, and why is it important? Answer 1.

9 Let us answer each question in turn: Transactions from these users can be interleaved to improve the execution time of users queries. By interleaving queries, users do not have to wait for other user s transactions to complete fully before their own transaction begins. Without interleaving, if user A begins a transaction that will take 10 seconds to complete, and user B wants to begin a transaction, user B would have to wait an additional 10 seconds for user A s transaction to complete before the database would begin processing user B s request. 3. A user must guarantee that his or her transaction does not corrupt data or insert nonsense in the database. For example, in a banking database, a user must guarantee that a cash withdraw transaction accurately models the amount a person removes from his or her account. A database application would be worthless if a person removed 20 dollars from an ATM but the transaction set their balance to zero. A DBMS must guarantee that transactions are executed fully and independently of other transactions. An essential property of a DBMS is that a transaction should execute atomically, or as if it is the only transaction running. Also, transactions will either complete fully, or will be aborted and the database returned to it s initial state. This ensures that the database remains consistent. 4. Strict two-phase locking uses shared and exclusive locks to protect data. A transaction must hold all the required locks before executing, and does not release any lock until the transaction has completely finished. 5. The WAL property affects the logging strategy in a DBMS. The WAL, Write- Ahead Log, property states that each write action must be recorded in the log (on disk) before the corresponding change is reflected in the database itself. This protects the database from system crashes that happen during a transaction s execution.

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database management systems solutions manual fourth edition