DBMS. Courtesy Owais Ahmed. Redundancy is dangerous as it is a potential threat to data

Transcription

1 DBMS If every non-key attribute is functionally dependent on the primary key, then the relation will be in Option A: 1NF Option B: 2NF Option C: 3NF Option D: 4NF Which of the following is record based logical model? Option A: Object-oriented model Option B: Relational Model Option C: Entity Relationship Model Option D: None Of These In an E-R diagram ellipses represent Option A: Entity sets Option B: Relationship among entity sets Option C: Attributes Option D: Link in attributes & entity sets The set of permitted values for each attribute is called its Option A: attribute set Option B: attribute range Option C: group Option D: domain Relations produced from an E-R model will always be in Option A: 1NF Option B: 2NF Option C: 3NF Option D: 4NF E-R modeling technique is a Option A: Top-down approach Option B: Bottom-up approach Option C: Left-right approach Redundancy is dangerous as it is a potential threat to data Option A: Integrity Option B: Consistency Option C: Both Option D: None Who of the following is more concerned about the conceptual level of the DBMS Option A: DBA Option B: The end user Option C: The Systems programmer Option D: Client An Attribute of one table matching the primary key of another table is called as Option A: Foreign key Option B: Secondary key Option C: Candidate key Option D: Composite Key If a relation is in BCNF, then it is also in Option A: 1NF Option B: 2NF Option C: 3NF The way a particular application views the data from the database that the application uses is a Option A: Module Option B: Relational Model Option C: Schema Option D: Sub Schema Locking can not be used for Option A: Deadlock Option B: Lost Update Option C: Uncommitted dependency Option D: Inconsistent data

2 In relation Model Column is referred to as Option A: Tuple Option B: Entity Option C: Degree Option D: Attribute ER Model Comes under Option A: Physical data Model Option B: Record based logical Model Option C: Object based logical Model Which of the following is the problem of file management system? Option A: Lack of data independence Option B: Data redundancy Option C: Update Which of the following is a relational database Option A: 4th Dimensions Option B: FoxPro Option C: dbase-iv Option D: All of the above The Index consists of Option A: A list of keys Option B: Pointers to the master list Option C: Both (a) & (b) Report generators are used to Option A: Store data input by a user Option B: retrieve information from files Option C: Answer queries Option D: Both (b) & (c) In a relational schema, each tuple is divided into fields called Option A: Relations Option B: Domains Option C: Queries The set of permitted values for each attribute is called its Option A: Attribute set Option B: Attribute range Option C: Domain Option D: Group Correct Answer: Which of the following is not the characteristics of a relational database model? Option A: Tables Option B: Treelike structures Option C: Complex logical relationship Option D: Records A table consists of Option A: Fields & columns Option B: Rows & columns Option C: Rows & cells A large computer information system maintains many different computer files. Which file is perpetual file Option A: Log File Option B: Master File Option C: Specialized File Option D: Update file Which command is used to remove a table or index from the database in SQL? Option A: Delete table Option B: Drop table Option C: Erase table The modify operation is likely to be done after Option A: Delete Option B: Look-up

3 Option C: Insert Which of the following contains complete record of all activity that affect the contents of a database Option A: Transaction Log Option B: Query Language Option C: Report Writer Option D: Data Manipulation Language The logical data structure with one to many relationship is a Option A: Network Option B: Tree Option C: Chain The command used to select only one copy of each set of duplicable rows Option A: Select Distant Option B: Select Unique Option C: Select Different Which of the following is at highest level in the hierarchy of data organization? Option A: Data Record Option B: Data File Option C: Database Option D: Data Bank The model for a record management system might be Option A: Business Form Option B: Handwritten list Option C: A rolodex card fill In a multi-user database, if two user wish to update the same record at the same time, they are prevented by Option A: Jamming Option B: Password Option C: Documentation Option D: Record lock The distinguishable parts of a record are called Option A: Data Option B: Files Option C: Fields Embedded pointers provide Option A: An inverted index Option B: A secondary access path Option C: A physical record key Which database handles full text data, image, audio and video? Option A: Transaction database Option B: Graphics database Option C: Video on demand database Option D: Multimedia database An entry in a telephone book can be compared to a Option A: Database Option B: Record Option C: File Option D: Field A data dictionary does not provide information about Option A: Where data is located Option B: Who owns it Option C: Size of disk storage device Option D: How the data is used Data item characteristics that are important in data management include Option A: Width Option B: Language Option C: Spelling

4 Data security threat include Option A: Privacy invasion Option B: Hardware failure Option C: Fraudulent manipulation of data A schema describes Option A: Record & files Option B: Data elements Option C: Record relationships Option D: All of the above Which language is used by most of DBMS's for helping their users to access data? Option A: 4GL Option B: SQL Option C: Query languages Option D: HLL What is a DATABLOCK? Option A: Set of Extents Option B: Set of Segments Option C: Smallest Database storage unit A Transaction ends Option A: Only when it is Committed Option B: Only when it is Rolledback Option C: When it is Committed or Rolledback A Database Procedure is stored in the Database? Option A: In compiled form Option B: As source code Option C: Both A & B Option D: Not stored What does a COMMIT statement do to a CURSOR? Option A: Open the Cursor Option B: Fetch the Cursor Option C: Close the Cursor Which of the following is TRUE for the SYSTEM VARIABLE $$date$$? Option A: Can be assigned to a global variable Option B: Can be assigned to any field only during design time Option C: Can be assigned to any variable or field during run time Which of the following packaged procedure is UNRESTRICTED? Option A: CALL_INPUT Option B: CLEAR_BLOCK Option C: EXECUTE_QUERY Option D: USER_EXIT What is SQL*FORMS? Option A: SQL*FORMS is a 4GL tool for developing & executing Oracle based interactive applications Option B: SQL*FORMS is a 3GL tool for connecting to the Database Option C: SQL*FORMS is a reporting tool. The packaged procedure that makes data in form permanent in the Database is Option A: Post Option B: Post form Option C: Commit form For the following statements which is true? (1) Page is an object owned by a form. (2) Pages are a collection of display information such as constant text and graphics. Option A: Only 1 is true Option B: Only 2 is true

5 Option C: Both 1 & 2 are true Option D: Both 1 & 2 are false Name the two files that are created when you generate a form using Forms 3.0? Option A: FMB & FMX Option B: FMR & FDX Option C: INP & FRM What is a trigger? Option A: A piece of logic written in PL/SQL Option B: Executed at the arrival of a SQL*FORMS event Option C: Both A & B Which of the following is TRUE for a ERASE packaged procedure (1) ERASE removes an indicated Global variable & releases the memory associated with it. (2) ERASE is used to remove a field from a page. Option A: Only 1 is true Option B: Only 2 is true Option C: Both 1 & 2 are true Option D: Both 1 & 2 are false Size of Tablespace can be increased by? Option A: Increasing the size of one of the Datafiles Option B: Adding one or more Datafiles Option C: Cannot be increased A FORM is made up of which of the following objects? Option A: Block, fields only Option B: Blocks, fields, pages only Option C: Blocks, fields, pages, triggers and form level procedures Option D: Only blocks Which of the following is TRUE for the ENFORCE KEY field? (1) ENFORCE KEY field characteristic indicates the source of the value that SQL*FORMS uses to populate the field. (2) A field with the ENFORCE KEY characteristic should have the INPUT ALLOWED characteristic turned off. Option A: Only 1 is true Option B: Only 2 is true Option C: Both 1 & 2 are true Option D: Both 1 & 2 are false The system variable that records the select statement that SQL * FORMS most recently used to populate a block is Option A: SYSTEM.LAST_RECORD Option B: SYSTEM.CURSOR_RECORD Option C: SYSTEM.LAST_QUERY Option D: SYSTEM.CURSOR_FIELD Why is it better to use an INTEGRITY CONSTRAINT to validate data in a table than to use a STORED PROCEDURE? Option A: Because an integrity constraint is automatically checked while data is inserted into or updated in a Option B: Because the stored procedure occupies more space in the database than a integrity constraint definit Option C: Because a stored procedure creates more network traffic than a integrity constraint definition In a CLIENT/SERVER environment, which of the following would not be done at the client? Option A: User interface part Option B: Data validation at entry line Option C: Responding to user events Which of the following is not an advantage of GUI systems? Option A: Intuitive and easy to use

6 Option B: GUI's can display multiple applications in multiple windows Option C: GUI's provide more user interface objects for a developer Which of the following is not an reason for the fact that most of the processing is done at the server? Option A: To reduce network traffic Option B: For application sharing Option C: To implement business rules centrally translator which reads an entire programme written in high level language and converts it into machine language code is: Option A: assembler Option B: translator Option C: compiler Option D: system software Which of the following system software does the job of merging the records from two files into one? Option A: Security software Option B: Utility program Option C: Networking software Option D: Documentation system Which of the following types of software should you if you often need to create, edit and print document? Option A: Spread sheet Option B: Desktop publishing Option C: UNIX Option D: Work processing The computer system of a computer serves as a software interface between the user and: Option A: hardware Option B: peripheral Option C: memory Option D: screen what is the name of the technique in Which the operating system of a computer executes several programs concurrently by switching back and forth between them? Option A: Partitioning Option B: Multitasking Option C: Windowing Option D: Paging What is the name of the given to the organized collection of software that controls the overall operation of a computer? Option A: Working system Option B: Peripheral system Option C: Operating system Complete indexing is defined as an index existing for every distinct field combination in the indexed file. The number of indexes necessary to provide complete indexing for a file defined on 4 fields: Option A: 8 Option B: 6 Option C: 16 Option D: 10 The file organization technique which provides a very fast direct access is: Option A: Inverted organization Option B: Regular organization Option C: Multilist organization Option D: Hashed organization The simplest file organization technique is the Option A: Inverted organization Option B: Multilist organization Option C: Regular organization Option D: Hierarchical organization

7 The file organization technique which includes an index on every secondary field is Option A: Inverted organization Option B: Multilist organization Option C: Regular organization Option D: Hierarchical organization Periodically adding, changing and deleting file records is called file: Option A: updating Option B: upgrading Option C: restructuring Option D: renewing The function of a database is: Option A: to check all input data Option B: to check all spelling Option C: to collect and organize input data Option D: to output data A number of related records that are treated as a unit is called: Option A: file Option B: field Option C: data Option D: batch The highest level in the hierarchy of data organization is called: Option A: data link Option B: data base Option C: data file Option D: data record A scheme describes: Option B: a physical record key Option C: an inverted index Option D: all of the above Which of the following is true of a network structure? Option A: It is a physical representation on the data Option B: It allows a many-to many relationship Option C: It is conceptually simple Option D: It will be dominant data base of the future Which of the following is not a logical data-base structure: Option A: tree Option B: relational Option C: network Option D: chain The database environment has all of the following components except : Option A: users Option B: separate files Option C: database Option D: data-base administrator Which of the following is not a relational database? Option A: dbase 1V Option B: 4th dimension Option C: Fox Pro Option D: Reflex Option A: data elements Option B: records and files Option C: record relationships Option D: all of the above Embedded Pointer Provide: Option A: a secondary access path