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Thursday, November 29, 2012

CS403- Database Management Systems (Session - 2) Spring 2010

MIDTERM  EXAMINATION
Spring 2010
CS403- Database Management Systems (Session - 2)
    
Question No: 1    ( Marks: 1 )    - Please choose one
 
Which of the following is NOT a feature of Context DFD?
       ► one process (which represents the entire system)

       ► all sources/sinks (external entities)

       ► data flows linking the process to the sources and sinks (external entities)

       ► Sub-processes (which explain and decomposed the major process into small processes)

   
Question No: 2    ( Marks: 1 )    - Please choose one
 
Which of the following is true for the relational model?
►Degree of a relation is the number of rows in a relation.

►Null value is a blank or zero value given to an attribute value when its value is inapplicable or its value is unknown.

►Complex key is a key consisting of more than one attribute.

►Constraint is a rule that restricts the values in a database.

   
Question No: 3    ( Marks: 1 )    - Please choose one
 
Which one of the following four E-R diagrams is the typical result you obtain when you initially start with an E-R diagram containing just two entities, A and C, in a Many-to-Many relationship, and then introduce an associative entity (B).
       ►
       ►
      
       ►
   



Question No: 4    ( Marks: 1 )    - Please choose one
 
Which of the following most certainly implies the need for an entire table to implement?

       ► A binary relationship
       ► A ternary relationship
       ► A recursive relationship
       ► An identifying relationship
Question No: 5    ( Marks: 1 )    - Please choose one
 
Which of the following constraints enforces entity integrity?
       ► PRIMARY KEY
       ► FOREIGN KEY
       ► CHECK
       ► NOT NULL
   
Question No: 6    ( Marks: 1 )    - Please choose one
 
Which of the following is not true about relational tables?
       ► Column values are of the same kind.

       ► Each row is unique.              

       ► Each column must have a unique name.

       ►The sequence of rows is significant.

   
Question No: 7    ( Marks: 1 )    - Please choose one
 
In a conceptual model for a university, what type of relationship exists between Grade and Student entities?
       ► 1:1
       ► 1:M
       ► M:M
       ► Ternary
   
Question No: 8    ( Marks: 1 )    - Please choose one
 Controlling redundancy in a database management system DOES NOT help to
       ► avoid duplication

       ► avoid unnecessary wastage of storage space

       ► avoid unauthorized access to data

       ► avoid inconsistency among data


Question No: 9    ( 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: 10    ( Marks: 1 )    - Please choose one
 
Which of the following functions are NOT performed by a database administrator?

       ► Planning, designing and implementing database systems

       ► Establishing standards and procedures for database systems

       ► communicating with database users

       ► Allocation of storage locations and data structures

   
Question No: 11    ( Marks: 1 )    - Please choose one
 
Select the correct statement about the ANSI/SPARC architecture.
 ► The conceptual level is a level of indication between the internal level and the external level.

       ► The internal level in a database system will definitely be relational.           

► Any given database has many conceptual schemas and one physical schema, but it has only one external schemas.

► The external level is not concerned with individual user perceptions, while the conceptual level is concerned with a community user perception.

   
Question No: 12    ( Marks: 1 )    - Please choose one
 
Which of the following is a correct way to implement one-to-many relationship while designing tables?
► by splitting the data into two tables with primary key and foreign key relationships.

► using a junction table with the keys from both the tables forming the composite primary key of the junction table.

       ► by splitting each table into three
       ► as a single table and rarely as two tables with primary and foreign key relationships.

   
Question No: 13    ( Marks: 1 )    - Please choose one
 
Which of the following is not a benefit of normalization?
     
 ► Minimize insertion anomolies
       ► Minimize deletion anomolies
       ► Minimize updation anomolies
     
 ► Maximize redundancy
   

Question No: 14    ( 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 (EmpNo, DeptNo) -> ProjNo holds over R.
       ► The functional dependency EmpNo -> DeptNo holds over R.
       ► The functional dependency ProjNo -> DeptNo holds over R.

       ► The functional dependency (EmpNo, ProjNo) -> DeptNo holds over R.

   
Question No: 15    ( Marks: 1 )    - Please choose one
 
The Entity Relation Model models

       ► Entities, Relationships and Processes
       ► Entities and Relationships
       ► Relationships
       ► Entities
   
Question No: 16    ( Marks: 1 )    - Please choose one
 
As part of database naming conventions, attribute names should use suffixes such as ID, NUMBER or CODE for the _______.
       ► primary key   
       ► foreign key
       ► index
       ► determinant

   
Question No: 17    ( Marks: 2 )
 
For which purpose do we use relational data model?
   
Question No: 18    ( Marks: 2 )
 
What major problem can occur if we do not normalize a relation into the first normal form?
  
Question No: 19    ( Marks: 2 )
 
In which situation do a recursive relationship exist?

Question No: 20    ( Marks: 3 )
 
What is DML (Data Manipulation Language)?
    
Question No: 21    ( Marks: 3 )
 
What are the three important objectives for using data types while specifying attributes?
   
Question No: 22    ( Marks: 5 )
 
Briefly explain super key in relation with primary key.
   
Question No: 23    ( Marks: 5 )
 
When is a functional dependency F said to be minimal? 

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