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1. Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
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ASSIGNMENT
DRIVE FALL 2017
PROGRAM MCA
SEMESTER 5
SUBJECT CODE & NAME MCA5033-OPEN SOURCE DB SYSTEMS
BK ID B1874
CREDITS 4
MARKS 60
Note –The Assignmentisdividedinto2 sets.You have to answer all questionsinboth sets.Average
score of both assignments scored by you will be considered as your IA score. Kindly note that
answers for 10 marks questions should be approximately of 400 words.
Question. 1. Explain ACID properties in transaction management.
Answer:A transactionisasinglelogical unitof workwhichaccessesandpossiblymodifiesthecontents
of a database. Transactions access data using read and write operations.
In order to maintain consistency in a database, before and after transaction, certain properties are
followed. These are called ACID properties.
Atomicity
Question. 2. What are the different strategies of OSS licensing?
Explain briefly.
Answer: Faster development cycles can be achieved by having a strong strategy and a firm set of
standardguidelinesastohowyourcompanymanagesopensource software. We all know how much
everyone lovesfasterdevelopment cycles,butthisis justthe tip of the icebergwhenit comesto the
advantages of having an organized open source strategy.
Question. 3. Explain the SELECT and PROJECT operations.
Answer:Relational algebraisaprocedural querylanguage,whichtakesinstancesof relationsasinput
and yieldsinstancesof relationsasoutput.It usesoperatorsto performqueries.Anoperatorcan be

2. either unary or binary. They accept relations as their input and yield relations as their output.
Relational algebraisperformedrecursivelyonarelationandintermediateresultsare alsoconsidered
relations.
Question. 4. What is a Trigger? Describe trigger creation in detail.
Answer: A trigger defines a set of actions that are executed when a database event occurs on a
specifiedtable.A database eventisadelete,insert,orupdate operation.Forexample,if youdefine a
triggerfor a delete onaparticulartable,the trigger'sactionoccurs wheneversomeonedeletesarow
or rows from the table.
Along with constraints, triggers can help enforce data integrity rules with actions such as cascading
deletes or updates. Triggers can also perform a
Question. 5. Write short notes on:
a) Ingres
Answer: Ingres is a relational database management system (RDBMS) that evolved from a research
project at the University of California at Berkeley in the 1970s. There are two different versions of
Ingres: a public domain version, known as University Ingres or Berkeley Ingres; and a commercial
version currently marketed by Computer Associates, and known as OpenIngres, CA-OpenIngres,or
Ingres II.
d) PostgreSQL7
Answer: PostgreSQL7 command displays the execution plan that the Postgres planner generates for
the supplied query. The execution plan shows how the table(s) referenced by the query will be
scanned --- byplainsequential scan,index scanetc --- andif multiple tablesare referenced,whatjoin
algorithms will be used to bring together the required tuples from each input table.
The mostcritical partof the displayisthe estimatedqueryexecutioncost,whichisthe planner'sguess
at how long it will take to run the query (
e) PostgreSQL8
Answer: PostgreSQL8 command displays the execution plan that the PostgreSQL planner generates
for the suppliedstatement.The executionplanshowshow the table(s) referencedbythe statement
will be scanned — by plain sequential scan, index scan, etc. — and if multiple tables are referenced,
what join algorithms will be used to bring together the required rows from each input table.

3. The mostcritical part of the displayisthe estimatedstatementexecutioncost,whichisthe planner's
guessat howlong it will take to run the statement(measuredinunitsof diskpage fetches).Actually
two numbers are shown: the start-up time before
Question. 6. Describe briefly about the experimental evaluation.
Write the significance of generic benchmarks.
Answer: The last fewdecadeshas seena huge transformationinthe way businessesare conducted.
There has been a paradigm shift from product portfolio based marketing strategies to customer
focusedmarketingstrategies.The growthanddiversityof the markethasgreatlyprofitedconsumers
through higher availability, better quality and lower prices. The same factors however has made it
more difficult for businesses to maintain their
Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
help.mbaassignments@gmail.com
or
call us at : 08263069601