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1 CS403 Database Management Systems CS403Composed By Faheem Saqib A mega File of Final Term Solved Papers & Quizzes For more Help Rep At Faheem_saqib2003@yahoo.com Faheem.saqib2003@gmail.com FINALTERM EXAMINATION Spring 2011 CS403 Database Management Systems CS403Time: 90 min Marks: 58 Student Info Student ID: Center: Exam Date: 08 August 2011 Question No: 1 ( Marks: 1 ) - Please choose one Which one of the following E-R E R diagrams most correctly represents the relationship between Student and Grade entities? Question No: 2 ( Marks: 1 ) - Please choose one Which of the following statements are Data Definition Language command?

2 INSERT UPDATE GRANT TRUNCATE Data definition language (DDL) statements let you to perform these tasks: Create, alter, and drop schema objects Grant and revoke privileges and roles Analyze information on a table, index, or cluster Establish auditing options Add comments to the data dictionary Question No: 3 ( Marks: 1 ) - Please choose one Which of the following statements is true about the views? view is always a complete set of all the tables in a database View can not be used for retrieving data The results of using a view are not permanently stored in the database. Rows can not be updated or deleted in the view Question No: 4 ( Marks: 1 ) - Please choose one How many clustered index(es) do each database table have? Question No: 5 ( Marks: 1 ) - Please choose one Suppose there are 4 rows and 3 columns in TABLE1 and 6 rows and 5 coulmns in TABLE2; what is the size of the cartesian product incase of CROSS JOIN between these two tables?

3 Question No: 6 ( Marks: 1 ) - Please choose one Which of the following is not one of the properties of Transaction? atomicity consistency redundancy durability Question No: 7 ( Marks: 1 ) - Please choose one Which of the following is INCORRECT about VIEWS? It is not possible to left out the data which is not required for a specific view. A database view displays one or more database records on the same page. Views can be used as security mechanisms Views are generally used to focus the perception each user has of the database. Question No: 8 ( Marks: 1 ) - Please choose one Which of the following gives all the fields from employee table named as EMP? select * from EMP; select emp* from EMP' select emp_id where EMP; select * where EMP; Question No: 9 ( Marks: 1 ) - Please choose one Consider the relation Interview(CandidateNo, InterviewDate, InterviewTime, StaffNo, RoomNo) and the following functional dependencies. FD1 : CandidateNo, InterviewDate -> InterviewTime, StaffNo, RoomNo FD2 : RoomNo, InterviewDate, InterviewTime -> StaffNo, CandidateNo FD3 : StaffNo, InterviewDate -> RoomNo Which of the following is correct? The relation Interview is in 3NF The relation Interview is in BCNF. The FD3 violates 3NF. The FD2 violates 2NF. Question No: 10 ( Marks: 1 ) - Please choose one Which of the following types of partitioning reduces the chances of unbalanced partitions?

4 vertical List Hash Range Hash Partitioning: It is a type of horizontal partitioning. In this type particular algorithm is applied and DBMS knows that algorithm. So hash partitioning reduces the chances of unbalanced partitions to a large extent Question No: 11 ( Marks: 1 ) - Please choose one Which of the following is one of the purposes of using DDL commands? inserting records into databases updating records into databases manipulating databases creating and destroying databases Question No: 12 ( Marks: 1 ) - Please choose one Which of the following statements creates a database named COMPANY. CREATE DATABASE company CREATE DB company ADD DATABASE copmany CREATE company DATABASE Question No: 13 ( Marks: 1 ) - Please choose one What is the impact of setting multiple indexes for the same key, in index sequential files? Multiple indexes for the same key can not be set It increases efficiency It decreases efficiency It will increase complexity as the access time will be increased New records are added to an overflow file Record in main file that precedes it is updated to contain a pointer to the new record The overflow is merged with the main file during a batch update Multiple indexes for the same key field can be set up to increase efficiency Question No: 14 ( Marks: 1 ) - Please choose one Consider a transaction which includes following operations Z= Z + 10

5 Write Z... Suppose that the value of Z after addition and the execution of this operation is 17. Now against the write operation the entry made in the log file will be What does Z reflects in the above entry? Object being updated Identity of the transaction Object value Identity of the next transaction to be executed In the entry, Tn reflects the identity of the transaction, Z is the object being updated and 33 is the value that has to be placed in Z. Question No: 15 ( Marks: 1 ) - Please choose one Which of the following is not true regarding DB transactions? A set of database operations that are processed partly A database transaction is a logical unit of database operations A database transaction must be atomic A database transaction must contains the ACID property The transaction-processing system ensures that either all operations in a transaction are completed without error, or none of them are. If some of the operations are completed but errors occur when the others are attempted, the transaction-processing system rolls back all of the operations of the transaction (including the successful ones), thereby erasing all traces of the transaction and restoring the system to the consistent, known state that it was in before processing of the transaction began. If all operations of a transaction are completed successfully, the transaction is committed by the system, and all changes to the database are made permanent; the transaction cannot be rolled back once this is done Question No: 16 ( Marks: 1 ) - Please choose one Which of the following is not true about input forms? Provide an easy, effective, efficient way to enter data into a table Especially useful when the person entering the data is not familiar with the inner workings Provide different controls to add data into the tables One input forms can populate one table at a time Question No: 17 ( Marks: 1 ) - Please choose one Which of the following is an example of volatile memory? RAM ROM Flash memory CPU

6 Question No: 18 ( Marks: 1 ) - Please choose one Which of following is NOT generally the aim of data partitioning and placement of data? Reduce Workload Balance Workload Merging different relations Speed up rate of useful works. Question No: 19 ( Marks: 1 ) - Please choose one ALTER TABLE exams RENAME COLUMN Q_description TO Question_Descp, Std_ID to Student_ID. Syntax of ALTER TABLE is NOT correct. True False Question No: 20 ( Marks: 1 ) - Please choose one Which of the following is Advantage of Re-Hashing technique to handle the collisions? Collisions don t use primary table space Unlimited number of elements Fast access through use of main table space (page29) Overhead of multiple linked lists Question No: 21 ( Marks: 1 ) - Please choose one Materialized views and Indexes are NOT similar by the following way(s). They consume storage space They must be refreshed when the data in their master tables changes. They can be accessed directly using a SELECT statement All of the Given Unlike indexes, materialized views can be accessed directly using a SELECT statement. Question No: 22 ( Marks: 1 ) - Please choose one Select 'NORTH', CUSTOMER From CUST_DTLS Where REGION = 'N' Order By CUSTOMER Union Select 'EAST', CUSTOMER From CUST_DTLS Where REGION = 'E' Order By CUSTOMER The above statement: Has an error - the string should be in double quotes. Has an error - ORDER BY clause. Does not have an error. Has an error - the string in single quotes 'NORTH' and 'SOUTH'. Question No: 23 ( Marks: 1 ) - Please choose one A software package designed to store and manage databases

7 Database DBMS Data model Data A Database Management System (DBMS) is a software package designed to store and manage databases. Database Management Systems Question No: 24 ( Marks: 1 ) - Please choose one Who is responsible for authorizing access to the database, for coordinating and monitoring its use? Database Designers Database Administrators End Users Application Programmers Question No: 25 ( Marks: 1 ) - Please choose one A superkey that does not contain a subset of attributes that is itself a superkey is called a. candidate key primary key superkey secondary key Question No: 26 ( Marks: 1 ) - Please choose one A entity has a primary key that is partially or totally derived from the parent entity in the relationship. strong weak business relationship A weak entity has a primary key that is partially or totally derived from the parent entity in the relationship Question No: 27 ( Marks: 2 ) What is the data type? A data type (or datatype) In programming, a classification identifying one of various types of data, as floating-point, integer, or Boolean, stating the possible values for that type, the operations that can be done on that type, and the way the values of that type are stored. Question No: 28 ( Marks: 2 ) Which DML statement changes the values of one or more columns based on some conditions. Update command Question No: 29 ( Marks: 2 ) Name the two types of caching that are commonly used in personal computers?

8 Two types of caching are commonly used in personal computers: memory caching and disk caching Question No: 30 ( Marks: 2 ) What is Serial Execution? Serial execution is an execution where transactions are executed in a sequential order, that is, one after another. A transaction may consist of many operations. Serial execution means that all the operations of one transaction are executer first, followed by all the operations of the next transaction and like that. Question No: 31 ( Marks: 3 ) Write three benefits of using VIEWS. They work as table and, provide security from unauthorized access. updated automatically when some changes occurs in original table views give a group of user s access to just the information they are allowed to Question No: 32 ( Marks: 3 ) Shortly explain BYTE data field? Some of more frequently supported numeric data types include Byte, Integer, and Long Integer. Each of these types supports different range of numeric values and takes 1, 4 or 8 bytes to store. Now, if we declare the age attribute as Long Integer, it will definitely serve the purpose, but we will be allocating unnecessarily large space for each attribute. A Byte type would have been sufficient for this purpose since you won t find students or employees of age more than 255, the upper limit supported by Byte data type. Question No: 33 ( Marks: 3 ) State the main purpose of index in relation with the queries executions. It will help searching the required data by directly accessing it via index. Question No: 34 ( Marks: 5 ) Differentiate between the cluster index and non cluster index? 1 A cluster index is a form of tables which consist of column and rows. 2 Cluster index exists on the physical level 3 It sorts the data at physical level 4 It works for the complete table 5 There is a whole table in form of sorted data 6 A table can contain only one cluster index Non Cluster Index 1 A non cluster index is in the form of a report about the tables. 2 They are not created on the physical level but at the logical level 3 It does not sort the data at physical level 4 A table has 255 non clustered indexes

9 5 A table has many non clustered indexes. 6 It work on the order of data Question No: 35 ( Marks: 5 ) Consider the two relations, Department (Dept_Code, Dep_Name,Dept_Head) and Employee(Emp_ID,Emp_Name, Designation, DoB, Dept). Write SQL statement to drop the primary key of Department relation? The fields in Employee should reflect the removal in Department table. Answer: If you wanted to drop any Primary key column you first have to drop the primary key constraints and then you can drop the primary key column. ALTER TABLE Department DROP CONSTRAINT Pkzxyx; ALTER TABLE Department DROP COLUMN Dept_code; Question No: 36 ( Marks: 5 ) Briefly explain rollback and rollforward. There are two modes to database recovery, ROLLBACK and ROLLFORWARD. If a transaction abends, the user's transaction on the database is rolled back. ROLLBACK is the most common form of recovery. The other form of database recovery is ROLLFORWARD. If a hard disk fails, then a ROLLFORWARD is performed to restore the database to the point in time of the disk failure. The logs are kept because they would need to be applied to a full backup of the database to restore the database to the point of disk failure.

10 FINALTERM EXAMINATION Spring 2010 CS403- Database Management Systems Time: 90 min Marks: 58 Student Info Student ID: Center: Exam Date: Question No: 1 ( Marks: 1 ) - Please choose one Which one of the following E-R diagrams most correctly represents the relationship between Student and Grade entities?

11 Question No: 2 ( Marks: 1 ) - Please choose one Which of the following statements are Data Definition Language command? INSERT UPDATE GRANT TRUNCATE Question No: 3 ( Marks: 1 ) - Please choose one Which of the following statements is true about the views?

12 view is always a complete set of all the tables in a database View can not be used for retrieving data The results of using a view are not permanently stored in the database. Rows can not be updated or deleted in the view Question No: 4 ( Marks: 1 ) - Please choose one How many clustered index(es) do each database table have? Question No: 5 ( Marks: 1 ) - Please choose one

13 Suppose there are 4 rows and 3 columns in TABLE1 and 6 rows and 5 coulmns in TABLE2; what is the size of the cartesian product incase of CROSS JOIN between these two tables? Question No: 6 ( Marks: 1 ) - Please choose one Which of the following is not one of the properties of Transaction? atomicity consistency redundancy durability

14 Question No: 7 ( Marks: 1 ) - Please choose one Which of the following is INCORRECT about VIEWS? It is not possible to left out the data which is not required for a specific view. A database view displays one or more database records on the same page. Views can be used as security mechanisms Views are generally used to focus the perception each user has of the database. Question No: 8 ( Marks: 1 ) - Please choose one Which of the following gives all the fields from employee table named as EMP? select * from EMP; select emp* from EMP' select emp_id where EMP; select * where EMP;

15 Question No: 9 ( Marks: 1 ) - Please choose one Consider the relation Interview(CandidateNo, InterviewDate, InterviewTime, StaffNo, RoomNo) and the following functional dependencies. FD1 : CandidateNo, InterviewDate -> InterviewTime, StaffNo, RoomNo FD2 : RoomNo, InterviewDate, InterviewTime -> StaffNo, CandidateNo FD3 : StaffNo, InterviewDate -> RoomNo Which of the following is correct? The relation Interview is in 3NF The relation Interview is in BCNF. The FD3 violates 3NF. The FD2 violates 2NF. Question No: 10 ( Marks: 1 ) - Please choose one Which of the following types of partitioning reduces the chances of unbalanced partitions?

16 vertical List Hash Range Question No: 11 ( Marks: 1 ) - Please choose one Which of the following is one of the purposes of using DDL commands? inserting records into databases updating records into databases manipulating databases creating and destroying databases Question No: 12 ( Marks: 1 ) - Please choose one

17 Which of the following statements creates a database named COMPANY. CREATE DATABASE company CREATE DB company ADD DATABASE copmany CREATE company DATABASE Question No: 13 ( Marks: 1 ) - Please choose one What is the impact of setting multiple indexes for the same key, in index sequential files? Multiple indexes for the same key can not be set It increases efficiency It decreases efficiency It will increase complexity as the access time will be increased Question No: 14 ( Marks: 1 ) - Please choose one

18 Consider a transaction which includes following operations Z= Z + 10 Write Z... Suppose that the value of Z after addition and the execution of this operation is 17. Now against the write operation the entry made in the log file will be <Tn, Z, 33> What does Z reflects in the above entry? Object being updated Identity of the transaction Object value Identity of the next transaction to be executed Question No: 15 ( Marks: 1 ) - Please choose one Which of the following is not true regarding DB transactions? A set of database operations that are processed partly A database transaction is a logical unit of database operations A database transaction must be atomic A database transaction must contains the ACID property

19 Question No: 16 ( Marks: 1 ) - Please choose one Which of the following is not true about input forms? Provide an easy, effective, efficient way to enter data into a table Especially useful when the person entering the data is not familiar with the inner workings Provide different controls to add data into the tables One input forms can populate one table at a time Question No: 17 ( Marks: 1 ) - Please choose one Which of the following is an example of volatile memory? RAM ROM Flash memory CPU Question No: 18 ( Marks: 1 ) - Please choose one

20 Which of following is NOT generally the aim of data partitioning and placement of data? Reduce Workload Balance Workload Merging different relations Speed up rate of useful works. Question No: 19 ( Marks: 1 ) - Please choose one ALTER TABLE exams RENAME COLUMN Q_description TO Question_Descp, Std_ID to Student_ID. Syntax of ALTER TABLE is NOT correct. True

21 False Question No: 20 ( Marks: 1 ) - Please choose one Which of the following is Advantage of Re-Hashing technique to handle the collisions? Collisions don t use primary table space Unlimited number of elements Fast access through use of main table space Overhead of multiple linked lists Question No: 21 ( Marks: 1 ) - Please choose one Materialized views and Indexes are NOT similar by the following way(s). They consume storage space

22 They must be refreshed when the data in their master tables changes. They can be accessed directly using a SELECT statement All of the Given Question No: 22 ( Marks: 1 ) - Please choose one Select 'NORTH', CUSTOMER From CUST_DTLS Where REGION = 'N' Order By CUSTOMER Union Select 'EAST', CUSTOMER From CUST_DTLS Where REGION = 'E' Order By CUSTOMER The above statement: Has an error - the string should be in double quotes. Has an error - ORDER BY clause. Does not have an error. Has an error - the string in single quotes 'NORTH' and 'SOUTH'.

23 Question No: 23 ( Marks: 1 ) - Please choose one A software package designed to store and manage databases Database DBMS Data model Data Question No: 24 ( Marks: 1 ) - Please choose one Who is responsible for authorizing access to the database, for coordinating and monitoring its use?

24 Database Designers Database Administrators End Users Application Programmers Question No: 25 ( Marks: 1 ) - Please choose one A superkey that does not contain a subset of attributes that is itself a superkey is called a. Candidate key Primary key Superkey Secondary key

25 Question No: 26 ( Marks: 1 ) - Please choose one A entity has a primary key that is partially or totally derived from the parent entity in the relationship. strong weak business relationship FINALTERM EXAMINATION Spring 2010 CS403- Database Management Systems (Session - 2) Ref No: Time: 90 min Marks: 58 Student Info StudentID: Center: OPKST

26 ExamDate: 07 Aug 2010 For Teacher's Use Only Q No Total Marks Q No Marks Q No Marks Q No Marks Q No Marks

27 Question No: 1 ( Marks: 1 ) - Please choose one Which feature of database provides conversion from inconsistent state of DB to a consistent state ensuring minimum data loss? User accessible catalog Data processing Authorization service Recovery service Question No: 2 ( Marks: 1 ) - Please choose one Which of the following statements is true about the views? view is always a complete set of all the tables in a database View can not be used for retrieving data The results of using a view are not permanently stored in the database. Rows can not be updated or deleted in the view

28 Question No: 3 ( Marks: 1 ) - Please choose one Which of the following is true about TRUNCATE? Can be Rolled back. Activates Triggers. is DML Command. Resets identity of the table. Question No: 4 ( Marks: 1 ) - Please choose one Which of the following is the correct way to find out the size of cartesian product incase of CROSS JOIN? the number of columns in the first table multiplied by the number of columns in the second table. the number of columns in the first table multiplied by the number of rows in the second table. the number of rows in the first table multiplied by the number of columns in the first table. the number of rows in the first table multiplied by the number of rows in the second table. Question No: 5 ( Marks: 1 ) - Please choose one

29 Suppose there are 8 rows and 4 columns in TABLE1 and 3 rows and 4 coulmns in TABLE2; what is the size of the cartesian product incase of CROSS JOIN between these two tables? Question No: 6 ( Marks: 1 ) - Please choose one Which of the following is not one of the properties of Transaction? atomicity consistency redundancy durability Question No: 7 ( Marks: 1 ) - Please choose one Which of the following is INCORRECT about VIEWS? It is not possible to left out the data which is not required for a specific view. A database view displays one or more database records on the same page. Views can be used as security mechanisms Views are generally used to focus the perception each user has of the database.

30 Question No: 8 ( Marks: 1 ) - Please choose one Each course section is assigned a particular faculty member, and each course section corresponds to a particular course. Conceptually, what is the relationship between faculty and course (not course section). 1:1 1:M M:M Ternary Question No: 9 ( Marks: 1 ) - Please choose one Which of the following is used to add or drop columns in an existing table? ALTER HAVING SELECT THEN Question No: 10 ( Marks: 1 ) - Please choose one Which of the following is a correct way of selecting all the columns from a table called PERSONS? SELECT FROM * Persons SELECT * FROM Persons

31 SELECT * WHERE Persons SELECT WHERE * Persons Question No: 11 ( Marks: 1 ) - Please choose one Which of the following is NOT a feature of Indexed sequential files? Records are stored in sequence and index is maintained. Dense and nondense types of indexes are maintained. Track overflows and file overflow areas can not be ensured. Cylinder index increases the efficiency Question No: 12 ( Marks: 1 ) - Please choose one Consider the given relations Student and Instructor as given below. Please note that Fname and Lname also denote the First Name and Last Name respectively.

32 Which of the following statements is correct with respect to the two relations given above? The two relations are not union-compatible since their attribute names differ. The two relations are union-compatible since they have the same type of tuples. The set operations such as CARTESIAN PRODUCT and DIVISION can be applied on these two relations. To find out the students who are not instructors, it is necessary to perform the operation Student Instructor. Question No: 13 ( Marks: 1 ) - Please choose one Which of the following serves as a milestone or reference point in the log file? Constraints Relations

33 Check points Transactions identities Question No: 14 ( Marks: 1 ) - Please choose one Which of the following is not true regarding DB transactions? A set of database operations that are processed partly A database transaction is a logical unit of database operations A database transaction must be atomic A database transaction must contains the ACID property Question No: 15 ( Marks: 1 ) - Please choose one Which of the following are the general activities, which are performed during the development of application programs? Data input programs Editing

34 Display All of given Question No: 16 ( Marks: 1 ) - Please choose one Browser based forms are developed in the following tools EXCEPT HTML Scripting language Front Page Web-based Forms Question No: 17 ( Marks: 1 ) - Please choose one Which of the following is not a form of optical disk? CD ROM WORM

35 Erasable Optical EEPROM Question No: 18 ( Marks: 1 ) - Please choose one Which of the following is the correct description of cache hit? When data is found in the cache When data is removed in the cache The number of times the cache is accessed directly by the processor When data is lost from the cache Question No: 19 ( Marks: 1 ) - Please choose one which of the following situations, Clustering is suitable: In Frequently updating Relatively static Relatively deletion Relatively dynamic Question No: 20 ( Marks: 1 ) - Please choose one one type of constraint can be enforced in any table by CREATE command Only

36 True False Question No: 21 ( Marks: 1 ) - Please choose one Which of the following is disadvantage of chaining technique to handle the collisions? Unlimited Number of elements Fast re-hashing Overhead of multiple linked lists Maximum number of elements must be known Question No: 22 ( Marks: 1 ) - Please choose one Consider the following relation R and its sample data. (Consider that these are the only tuples for the given relation) Which of the following statements is NOT correct? The functional dependency ProjNo -> DeptNo holds over R. The functional dependency (EmpNo, ProjNo) -> DeptNo holds over R. The functional dependency DeptNo -> ProjNo holds over R. The functional dependency EmpNo -> DeptNo holds over R.

37 Question No: 23 ( Marks: 1 ) - Please choose one entity type is An defined when the database is actually constructed a specific type such as an integer, text, date, logical etc a coherent set of similar objects that we want to store data on (e.g. STUDENT, COURSE, CAR) defined by the database designer Question No: 24 ( Marks: 1 ) - Please choose one entity can be logically connected to another by defining a. An hyperlink common attribute primary key superkey Question No: 25 ( Marks: 1 ) - Please choose one can t modify more than one table at a time through a view. True You False Question No: 26 ( Marks: 1 ) - Please choose one

38 Which of the following is one of the purposes of using DML commands? Creating databases Destroying databases Inserting data in tables Non of the above Question No: 27 ( Marks: 2 ) Question No: 28 ( Marks: 2 ) Define domain of an attribute. We have discussed in the previous section that every attribute has got a name. Next thing is that a domain is also associated with an attribute. These two things, name and the domain, are part of the definitions of an attribute and we must provide them. Domain is the set of possible values that an attribute can have, that is, we specify a set of values either in the form of a range or some discrete values, and then attribute can have value out of those values. Domain is a form of a check or a constraint on attribute that it cannot have a value outside this set. Question No: 29 ( Marks: 2 ) Write the main feature of volatile storage media? Computer storage that is lost when the power is turned off is called as volatile storage.

39 Question No: 30 ( Marks: 2 ) Suppose you want to delete a table row by row and record an entry in the transaction log for each deleted row. Which DML command will you use? Question No: 31 ( Marks: 3 ) Write three benefits of using VIEWS. Question No: 32 ( Marks: 3 ) SELECT * FROM Persons WHERE FirstName LIKE '%da%'; what does the above statement return? Question No: 33 ( Marks: 3 ) What is the difference between a primary key and a unique key with reference to clustered and nonclustered indexes? Primary Indexes: Consider a table, with a Primary Key Attribute being used to store it as an ordered array (that is, the records of the table are stored in order of increasing value of the Primary Key attribute.)as we know, each BLOCK of memory will store a few records of this table. Since all search operations require transfers of complete blocks, to search for a particular record, we must first need to know which block it is stored in. If we know the address of the block where the record is stored, searching for the

40 record is very fast. Notice also that we can order the records using the Primary Key attribute values. Thus, if we just know the primary key attribute value of the first record in each block, we can determine quite quickly whether a given record can be found in some block or not. This is the idea used to generate the Primary Index file for the table. Users often need to access data on the basis of non-key or non-unique attribute; secondary key. Like student name, program name, students enrolled in a particular program.records are stored on the basis of key attribute; three possibilities However, we have already ordered the records of our table using the Primary key. We cannot order the records again using the secondary key (since that will destroy the utility of the Primary Index Therefore, the Secondary Index is a two column file, which stores the address of every tuple of the table. Question No: 34 ( Marks: 5 ) Consider a table named COMPANY with fields COMPANY_NAME, DESCRIPTION, ORDER_NUMBER. Write an SQL statement to display company names in reverse alphabetical order. Question No: 35 ( Marks: 5 ) Name the five main components of Database management systems software.

41 Components of DBMS DBMS Engine accepts logical request from the various other DBMS subsystems, converts them into physical equivalents, and actually accesses the database and data dictionary as they exist on a storage device. Data Definition Subsystem helps user to create and maintain the data dictionary and define the structure of the files in a database. Data Manipulation Subsystem helps user to add, change, and delete information in a database and query it for valuable information. Software tools within the data manipulation subsystem are most often the primary interface between user and the information contained in a database. It allows user to specify its logical information requirements. Application Generation Subsystem contains facilities to help users to develop transactionintensive applications. It usually requires that user perform a detailed series of tasks to process a transaction. It facilitates easy-to-use data entry screens, programming languages, and interfaces. Data Administration Subsystem helps users to manage the overall database environment by providing facilities for backup and recovery, security management, query optimization, concurrency control, and change management. Question No: 36 ( Marks: 5 ) 4 similarities between Materialized views and indexes. Give CS403 Database Management System All Papers in Single file Question No: 1 ( Marks: 1 ) - Please choose one Making a change to the conceptual schema of a database but not affecting the existing external schemas is an example of Physical data independence. Concurrency control.

42 Logical data independence. Functional dependency Page No. 44 Logical data independence Logical data independence provides the independence in a way that changes in conceptual model do not affect the external views. Or simply it can be stated at the Immunity of external level from changes at conceptual level. Question No: 2 ( Marks: 1 ) - Please choose one GRANT SELECT, UPDATE(Designation) ON Employee TO Amali,Hiruni WITH GRANT OPTION; What does this SQL statement do? Grant permission to Amali,only to retrieve data from Employee table and grant permission to Hiruni, only to update the designation from Employee table. Grant permission to Hiruni in order to grant, select and update permission to Amali. Grant permission to Amali & Hiruni to update designation of employees in the Employee table. Grant permission to Amali and Hiruni to update all data except designation in Employee table. Question No: 3 ( Marks: 1 ) - Please choose one Which key word is available in SQL to enforce referential integrity? Check Primary Key Set Default Unique Page No. 134 Question No: 4 ( Marks: 1 ) - Please choose one

43 Which of the following statements are Data Definition Language command? INSERT UPDATE GRANT TRUNCATE Commands of DDL 1. Create 2. Alter 3. Truncate 4. Drop Question No: 5 ( Marks: 1 ) - Please choose one How many clustered index(es) do each database table have? Page No. 275 A clustered index determines the storage order of data in a table. A clustered index is analogous to a telephone directory, which arranges data by last name. Because the clustered index dictates the physical storage order of the data in the table, a table can contain only one clustered index

44 Question No: 6 ( Marks: 1 ) - Please choose one Which of the following is true about DELETE command? is DDL Command. Resets identity of the table. cannot activate a trigger. Can be Rolled back.(true) Question No: 7 ( Marks: 1 ) - Please choose one Which of the following will be deleted relating to a table if you use TRUNCATE command? all rows in a table indexes table structure and its columns constraints Question No: 8 ( Marks: 1 ) - Please choose one Which of the following is not true about De-normalization? It is the process of attempting to optimize the performance of a database De-normalization is a technique to move from lower to higher normal forms of database modeling In de-normalization it is required to add redundant data. It enhances the performance of DB Question No: 9 ( Marks: 1 ) - Please choose one Which of the following is not a feature of TRANSACTION? Users should be able to regard the execution of each transaction as atomic. Each transaction, run by itself.

45 must preserve the consistency of the database dependant on other concurrent transactions Question No: 10 ( Marks: 1 ) - Please choose one Which of the following gives all the fields from employee table named as EMP? select * from EMP; select emp* from EMP' select emp_id where EMP; select * where EMP; Question No: 11 ( Marks: 1 ) - Please choose one Suppose there are 4 fields in a table named CUST (customer_id, first_name, last_name, phone). Which of the following gives all the information of the customers in the table whose last name is ALI? SELECT * FROM CUST WHERE last_name='ali'; SELECT * FROM CUST WHERE last_name=ali; SELECT * FROM CUSTOMER WHERE name=ali; SELECT * FROM CUSTOMER WHERE last_name=ali; Question No: 12 ( Marks: 1 ) - Please choose one Identify the correct statement with respect to normalization. Normalization is a formal technique that can be used only at the starting phase of the database design. Normalization can be used as a top-down standalone database design technique. The process of normalization through decomposition must achieve the lossless join property at any cost whereas the dependency reservation property is sometimes sacrificed. The process of normalization through decomposition must achieve the dependency reservation property at any cost whereas the lossless join property is sometimes sacrificed. Question No: 13 ( Marks: 1 ) - Please choose one Which of the following is not true with respect to denormalization? A denormalized data model is not the same as a data model that has not been normalized Denormalization takes place before the normalization process

46 It is an attempt to optimize the performance of database Denormalization process can not be initiated before the Database design Question No: 14 ( Marks: 1 ) - Please choose one Which of the following is incorrect with respect to indexed sequential files? New records are added to an overflow file Record in main file that precedes it is updated to contain a pointer to the new record The overflow is merged with the main file during a batch update Multiple indexes for the same key field cannot be setup Question No: 15 ( Marks: 1 ) - Please choose one Which of the following types of partitioning reduces the chances of unbalanced partitions? vertical List Hash Range Question No: 16 ( Marks: 1 ) - Please choose one DML commands are used for: inserting data into databases creating databases destroying databases creating DB objects Question No: 17 ( Marks: 1 ) - Please choose one Which of the following is INCORRECT with respect to file systems? At the physical level, pointer or hashed address scheme may be employed to provide a certain degree of data independence at the user level. A logical record is concerned with efficient storage of information in the secondary storage devices. Some physical organisations use pointers to record blocks to locate records on disk. The efficiency of a file system depends on how efficiently operations such as retrieve, insert, update, delete may be performed on the information stored in the file. Question No: 18 (Marks: 1) - Please choose one which of the following is correct regarding Dataflow diagram?

47 Single DFD is required to represent a system The dataflow must be bidirectional Created at increasing levels of detail Used to represent the relationships among the external entities Question No: 19 ( Marks: 1 ) - Please choose one Select the correct statement among the following on proper naming of schema constructs: Entity type name applies to all the entities belonging to that entity type and therefore a plural name is selected for entity type. In the narrative description of the database requirements, verbs tend to indicate the names of relationship types. The nouns arising from a database requirement description can be considered as names of attributes. Additional nouns which are appearing in the narrative description of the database requirements represent the weak entity type names. Question No: 20 ( Marks: 1 ) - Please choose one Structural constraints of a relationship type refer to identifying the owner entity type relevant to a given entity type whether the existence of an entity depends on it being related to another entity via the relationship type. the role that a participating entity from the entity type plays in each relationship instance. the constraints applicable in granting access to tables, columns and views in a database schema. Question No: 21 ( Marks: 1 ) - Please choose one Identify the correct statement. Entity integrity constraints specify that primary key values can be composite. Entity integrity constraints are specified on individual relations. Entity integrity constraints are specified between weak entities. When entity integrity rules are enforced, a tuple in one relation that refers to another relation must refer to an existing tuple.

48 Question No: 22 ( Marks: 1 ) - Please choose one What is the impact of setting multiple indexes for the same key, in index sequential files? Multiple indexes for the same key can not be set It increases efficiency It decreases efficiency It will increase complexity as the access time will be increased Question No: 23 ( Marks: 1 ) - Please choose one Which of the following is not true regarding Indexes? Index can be defined even when there is no data in the table It support Range selections It can be created using Create Index statement It can not be created on composite attributes Question No: 24 ( Marks: 1 ) - Please choose one While recovering data, which of the following files does a recovery manager examines at first? A system file Log file Data dictionary Metadata Question No: 25 ( Marks: 1 ) - Please choose one The main memory of a computer system is also known as ROM RAM PROM Hard disk Question No: 26 ( Marks: 1 ) - Please choose one is a control that enables users to select one option from an associated list; users can also type an option. Combo box Button

49 Text box Static area Question No: 27 ( Marks: 1 ) - Please choose one records data by burning microscopic holes in the surface of the disk with a laser. Hard disk RAM Optical disk Floppy disk Question No: 28 ( Marks: 1 ) - Please choose one Which of following is NOT generally the aim of data partitioning and placement of data? Reduce Workload Balance Workload Merging different relations Speed up rate of useful works. Question No: 29 ( Marks: 1 ) - Please choose one ALTER TABLE exams RENAME COLUMN Q_description TO Question_Descp, Std_ID to Student_ID. Syntax of ALTER TABLE is NOT correct. True False Question No: 30 ( Marks: 1 ) - Please choose one Which of the following is true regarding Index? Index can only be created for a single table in database Index can maximum be created for two tables in database Index should be created for every table in the database Index can be created for every table in the database Question No: 31 ( Marks: 1 ) What is procedural DML?

50 Procedural DML or Low level: DML requires a user to specify what data are needed and how to get those data. Procedural as the name specifies, it not only requires a user to specify what data is needed but also the procedure how to retrieve it. Question No: 32 ( Marks: 1 ) What does RAM stand for? Ram stands for random access memory. It is the main memory of the computer. Question No: 33 ( Marks: 2 ) Which DML statement changes the values of one or more columns based on some conditions. The UPDATE statement changes the values of one or more columns based on some condition. This updated value can also be the result of an expression or calculation. Question No: 34 ( Marks: 2 ) Name the two primary modes for taking Locks. There are two primary modes for taking locks: optimistic and pessimistic. Question No: 35 ( Marks: 3 ) Give three reasons of partitioning in the process of denormalization. The three reasons of partitioning is reduce workload, balance workload, speed up the rate of useful work Question No: 36 ( Marks: 3 ) Write any three factors which we consider while defining key in designing an

51 indexed sequential file? When you design an indexed sequential file, you must define each key in the following terms: Position and size Data type Index number Options selected Question No: 1 ( Marks: 1 ) - Please choose one Which feature of database provides conversion from inconsistent state of DB to a consistent state ensuring minimum data loss? User accessible catalog Data processing Authorization service Recovery service Question No: 2 ( Marks: 1 ) - Please choose one Which of the following statements is true about the views? view is always a complete set of all the tables in a database View can not be used for retrieving data The results of using a view are not permanently stored in the database.

52 Rows can not be updated or deleted in the view Question No: 3 ( Marks: 1 ) - Please choose one Which of the following is true about TRUNCATE? Can be Rolled back. Activates Triggers. is DML Command. Resets identity of the table. Question No: 4 ( Marks: 1 ) - Please choose one Which of the following is the correct way to find out the size of cartesian product incase of CROSS JOIN? the number of columns in the first table multiplied by the number of columns in the second table. the number of columns in the first table multiplied by the number of rows in the second table. the number of rows in the first table multiplied by the number of columns in the first table. the number of rows in the first table multiplied by the number of rows in the second table.

53 Question No: 5 ( Marks: 1 ) - Please choose one Suppose there are 8 rows and 4 columns in TABLE1 and 3 rows and 4 coulmns in TABLE2; what is the size of the cartesian product incase of CROSS JOIN between these two tables? Question No: 6 ( Marks: 1 ) - Please choose one Which of the following is not one of the properties of Transaction? atomicity consistency redundancy durability Question No: 7 ( Marks: 1 ) - Please choose one Which of the following is INCORRECT about VIEWS? It is not possible to left out the data which is not required for a specific view. A database view displays one or more database records on the same page. Views can be used as security mechanisms Views are generally used to focus the perception each user

54 has of the database. Question No: 8 ( Marks: 1 ) - Please choose one Each course section is assigned a particular faculty member, and each course section corresponds to a particular course. Conceptually, what is the relationship between faculty and course (not course section). 1:1 1:M M:M Ternary Question No: 9 ( Marks: 1 ) - Please choose one Which of the following is used to add or drop columns in an existing table? ALTER HAVING SELECT THEN Question No: 10 ( Marks: 1 ) - Please choose one Which of the following is a correct way of selecting all the columns from a table called PERSONS? SELECT FROM * Persons

55 SELECT * FROM Persons SELECT * WHERE Persons SELECT WHERE * Persons Question No: 11 ( Marks: 1 ) - Please choose one Which of the following is NOT a feature of Indexed sequential files? Records are stored in sequence and index is maintained. Dense and nondense types of indexes are maintained. Track overflows and file overflow areas can not be ensured. Cylinder index increases the efficiency Question No: 12 ( Marks: 1 ) - Please choose one Consider the given relations Student and Instructor as given below. Please note that Fname and Lname also denote the First Name and Last Name respectively.

56 Which of the following statements is correct with respect to the two relations given above? The two relations are not union-compatible since their attribute names differ. The two relations are union-compatible since they have the same type of tuples. The set operations such as CARTESIAN PRODUCT and DIVISION can be applied on these two relations. To find out the students who are not instructors, it is necessary to perform the operation Student Instructor. Question No: 13 ( Marks: 1 ) - Please choose one Which of the following serves as a milestone or reference point in the log file? Constraints Relations

57 Check points Transactions identities Question No: 14 ( Marks: 1 ) - Please choose one Which of the following is not true regarding DB transactions? A set of database operations that are processed partly A database transaction is a logical unit of database operations A database transaction must be atomic A database transaction must contains the ACID property Question No: 15 ( Marks: 1 ) - Please choose one Which of the following are the general activities, which are performed during the development of application programs? Data input programs Editing Display

58 All of given Question No: 16 ( Marks: 1 ) - Please choose one Browser based forms are developed in the following tools EXCEPT HTML Scripting language Front Page Web-based Forms Question No: 17 ( Marks: 1 ) - Please choose one Which of the following is not a form of optical disk? CD ROM WORM Erasable Optical

59 EEPROM Question No: 18 ( Marks: 1 ) - Please choose one Which of the following is the correct description of cache hit? When data is found in the cache When data is removed in the cache The number of times the cache is accessed directly by the processor When data is lost from the cache Question No: 19 ( Marks: 1 ) - Please choose one In which of the following situations, Clustering is suitable: Frequently updating Relatively static Relatively deletion Relatively dynamic Question No: 20 ( Marks: 1 ) - Please choose one Only one type of constraint can be enforced in any table by CREATE command True

60 False Question No: 21 ( Marks: 1 ) - Please choose one Which of the following is disadvantage of chaining technique to handle the collisions? Unlimited Number of elements Fast re-hashing Overhead of multiple linked lists Maximum number of elements must be known Chaining: One simple scheme is to chain all collisions in lists attached to the appropriate slot. This allows an unlimited number of collisions to be handled and doesn't require a priori knowledge of how many elements are contained in the collection. The tradeoff is the same as with linked lists versus array implementations of collections: linked list overhead in space and, to a lesser extent, in time. Question No: 22 ( Marks: 1 ) - Please choose one Consider the following relation R and its sample data. (Consider that these are the only tuples for the given relation) Which of the following statements is NOT correct?

61 The functional dependency ProjNo -> DeptNo holds over R. The functional dependency (EmpNo, ProjNo) -> DeptNo holds over R. The functional dependency DeptNo -> ProjNo holds over R. The functional dependency EmpNo -> DeptNo holds over R. Question No: 23 ( Marks: 1 ) - Please choose one An entity type is defined when the database is actually constructed a specific type such as an integer, text, date, logical etc a coherent set of similar objects that we want to store data on (e.g. STUDENT, COURSE, CAR) defined by the database designer Question No: 24 ( Marks: 1 ) - Please choose one An entity can be logically connected to another by defining a. hyperlink common attribute primary key superkey Question No: 25 ( Marks: 1 ) - Please choose one

62 You can t modify more than one table at a time through a view. True False Question No: 26 ( Marks: 1 ) - Please choose one Which of the following is one of the purposes of using DML commands? Creating databases Destroying databases Inserting data in tables Non of the above FINAL TERM EXAMINATION SPRING 2010 CS403- DATABASE MANAGEMENT SYSTEMS (10 Aug 2010) Question No: 1 ( Marks: 1 ) - Please choose one Which of the following statements is true about the views? view is always a complete set of all the tables in a database View can not be used for retrieving data The results of using a view are not permanently stored in the database. Rows can not be updated or deleted in the view