Rdbms MCQ

Rdbms MCQ

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  • 09th Apr, 2022

Rdbms MCQ Quiz

Following are mostly asked Rdbms MCQ test that are designed for professionals like you to crack you interviews. You can take this Rdbms online test before appearing to you real interview. This Rdbms quiz there are around 30+ multiple choice questions on Rdbms with four options.

1) Which of the following are steps in query processing?

  • A. Optimization
  • B. Parsing and translation
  • C. Evaluation
  • D. All of the mentioned

2) A relational algebra operation annotated with instructions on how to evaluate it is called

  • A. Evaluation engine
  • B. Evaluation primitive
  • C. Evaluation plan
  • D. Evaluation algebra

3) A sequence of primitive operations that can be used to evaluate a query are:

  • A. Query evaluation engine
  • B. Query evaluation algebra
  • C. Query evaluation primitive
  • D. Query evaluation plan

4) The lowest level operator to access data in query processing is:

  • A. File handling
  • B. File scan
  • C. File manipulation
  • D. File organization

5) Search algorithms that use an index are referred to as:

  • A. Search scans
  • B. Equality scans
  • C. Index scans
  • D. Primary scans
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6) In the relational model, cardinality is termed as:

  • A. a number of tuples
  • B. a number of attributes
  • C. a number of tables
  • D. a number of constraints

7) Relational calculus is a:

  • A. procedural language
  • B. non-procedural language
  • C. data definition language
  • D. high-level language

8) The view of total database content is:

  • A. external view
  • B. conceptual view
  • C. internal view
  • D. physical view

9) Cartesian product in relational algebra is

  • A. unary operator
  • B. ternary operator
  • C. binary operator
  • D. not defined

10) DML is provided for:

  • A. the addition of new structures in the database system
  • B. description of the logical structures in the database system
  • C. definition of a physical structure of the database system
  • D. manipulation &processing of the database

11) as clause in SQL:

  • A. join operation
  • B. rename operation
  • C. projection operation
  • D. selection operation

12) ODBC stands for:

  • A. oral database connectivity
  • B. oracle database connectivity
  • C. open database connectivity
  • D. object database connectivity

13) Architecture of the database can be viewed as which level:

  • A. two levels
  • B. one level
  • C. three levels
  • D. four levels

14) In a relational model, relations are termed as:

  • A. tuples
  • B. rows
  • C. attributes
  • D. tables

15) The database schema is written in:

  • A. HLL
  • B. DCL
  • C. DDL
  • D. DML

16) In the architecture of a database system external level is the physical level:

  • A. view level
  • B. physical level
  • C. conceptual level
  • D. logical level

17) An entity set that does not have sufficient attributes to form a primary key is a:

  • A. simple entity set
  • B. strong entity set
  • C. primary entity set
  • D. weak entity set

18) In Hierarchical model records are organised as:

  • A. tree
  • B. list
  • C. graph
  • D. links

19) In an E-R diagram attributes are represented by:

  • A. triangle
  • B. rectangle
  • C. square
  • D. elipse

20) In case of entity integrity, the primary key may be:

  • A. any value
  • B. Null
  • C. not Null
  • D. both Null & not Null

21) The language used in application programs to request data from the DBMS is referred to as the:

  • A. SDL
  • B. VDL
  • C. DML
  • D. DDL

22) A logical schema:

  • A. describes how data is actually stored on disk
  • B. is the entire database
  • C. is a standard way of organizing information into accessible parts
  • D. both(A)and(C)

23) Related fields in a database are grouped to form a:

  • A. data file
  • B. menu
  • C. bank
  • D. data record

24) The database environment has all of the following components except:

  • A. separate files
  • B. database
  • C. users
  • D. database administrator

25) The language which has recently become the defacto standard for interfacing application programs with relational database system is:

  • A. SQL
  • B. 4GL
  • C. oracle
  • D. Dbase

26) The way a particular application views the data from the database that the application uses is a:

  • A. schema
  • B. module
  • C. subschema
  • D. relational model

27) A report generator is used to:

  • A. delete files
  • B. print files on paper
  • C. data entry
  • D. update files

28) The property/properties of a database is/are:

  • A. data stored in a database is independent of the application programs using it
  • B. it is an integrated collection of logically related records
  • C. it consolidates separate files into a common pool of data records
  • D. All of the above

29) The relational modelfeature is that there:

  • A. is much more data independence than some other database models
  • B. is no need for primary key data
  • C. are explicit relationships among records
  • D. are tables with many dimensions

30) Count function in SQL returns the number of:

  • A. distinct values
  • B. values
  • C. groups
  • D. columns

Rdbms Online Test Questions (Rdbms FAQs)

1) What is RDBMS?

RDBMS is a full form of relational database management system. It is a common database sign that gets stored up in the table. This way you can use in the relation to other datasets that are stored.

2) List some rdbms databases?

PostgreSQL, Microsoft SQL Server, MySQL and Oracle database are some RDBMS systems.

3) What is normalization in rdbms?

Using Normalization, you can organize the data in the database. You can also use it for reducing the redundancy frin certain relations set. It is also used for eliminating the undesirable characteristics such as deletion anomalies and insertion.

4) What is 'rdbms ipc message' wait event?

It is an indication that either the DBWn's write batch is quite big or you are performing checkpointing to a great extent.

5) Define the object-oriented model?

It is one approach to modelling certain application which you can use initially while starting the software life cycle when you use the approach which is an object-oriented approach.

6) What is relational algerbra?

This is one kind of a procedural query language that requires relation instances as the yields and input instances of the relation as the output.

7) List types of indexes in RDBMS?

Clustered Index, Non-Clustered Index, Unique Index, Filtered Index, Column store Index and Hash Index are some types of indexes in RDBMS.

8) What is transaction. Explain its properties?

This is one database system that consist of isolation, atomicity, consistency and even durability. It is also kwon as the properties of ACID that make sure completeness and accuracy is maintained.

9) Explain levels of data abstraction?

Levels of data abstraction

  • External or View level is all about the different views of the user.
  • Internal Level is all about the psychical structure of the storage.
  • Conceptual or Logical Level is all about the constraints and structure for the whole database.

10) What are constraints in database?

Constraints is the set of rules which has been enforced on the table’s data columns. It can also be used for limiting down the data type which can go on the table. This way reliability and accuracy in the database is assured.

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