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1. Dear students get fully solved assignments
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ASSIGNMENT
WINTER 2013
PROGRAM BSc IT
SEMESTER FIRST
SUBJECT CODE & NAME BT0066, Database Management Systems
CREDIT 3
BK ID B0950
MAX. MARKS 60
Note: Answer all questions. Kindly note that answers for 10 marks questions should be approximately
of 400 words. Eachquestion is followed by evaluation scheme.
Q.1 what is DBMS? Why it is required?
Answer: A database management system is the software system that allows users to define, create and
maintain a database and provides controlled access to the data.
A Database Management System (DBMS) is basically a collection of programs that enables users to
store, modify, and extract information from a database as per the requirements. DBMS is an
intermediate layer between programs and the data. Programs access the DBMS, which then accesses
the data. There are different types of DBMS
Q.2Explain MySQL architecture with diagram.
Answer:MySQL's architecture consists of a web of interrelated function sets, which work together to
fulfil the various needs of the database server. A number of authors3 have implied that these function
sets are indeed components, or entirely encapsulated packages; however, there is little evidence in the
source code that this is the case.

2. Indeed, the architecture includes separate function libraries, composed of functions that handle similar
tasks, but there is not, in the traditional object-oriented programming sense, a full component-level
separation of functionality. By this, we mean that
Q.3Differentiate between fixed and variable length records.
Answer: In the Fixed Length record is set to a certain length and the location is simply calculated in the
Variable Length Record the record size is irrelevant because all records are indexed sequentially in a
header record.Variable length record is the record contain different format (length) but the first 4 bytes
taking length of record. The fixed length record must be declaring length otherwise throw the error.so
after fill the records md fields’fill up the filler clause.Fixed length means the length of all records in the
file is
Same.so we code record length is x chrs
Q.4 Write an sql query to create the table named employee with the following attributes:
Employee number – not null
Employee name
Department id
Make employee number as primary key.
Answer: Employee Table (EMPLOYEE)
The employee table identifies all employees by an employee number and lists basic personnel
information. The employee table is created with the following CREATE TABLE and ALTER TABLE
statements:
Q.5 Explain First Normal form and Second Normal Form.
Answer: First normal form (1NF) is a property of a relation in a relational database. A relation is in first
normal form if the domain of each attribute contains only atomic values, and the value of each attribute
contains only a single value from that domain.Second normal form (2NF) is a normal form used in
database normalization. 2NF was originally defined by E.F. Codd in 1971.
Q.6 what is object oriented database system? Explain.
Answer:An object-oriented database is a database that subscribes to a model with information
represented by objects. Object-oriented databases are a niche offering in the relational database

3. management system (RDBMS) field and are not as successful or well-known as mainstream database
engines.
A system offering DBMS facilities in an object-oriented programming environment. Data is stored as
objects and can be interpreted only using the methods specified by its class. The relationship between
similar objects is preserved (inheritance) as are references between objects. Queries can be faster
because joins are often not needed (as in a
Dear students get fully solved assignments
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or
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