Bt0066 dbms
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This document provides information regarding solved assignments for B.Sc IT students, including details on various subjects and questions related to database management systems. It covers essential concepts such as entities in E-R diagrams, the importance of the relational data model, system catalogs in RDBMS, and data fragmentation. Students are instructed to send their semester and specialization information to a provided email or contact number for assistance.
![Code. In the relational model of a database, all data is represented in terms of tuples, grouped into
relations.A database organizedintermsof the relationalmodel isarelational database.
Diagram of an example database according to the
Q.3 What is the system catalog in RDBMS? Also explain what information is stored in the system
catalog.
Answer:- system catalog in RDBMS: The database catalog of a database instance consists of metadata in
which definitions of database objects such as base tables, views (virtual tables), synonyms, value ranges,
indexes,users,andusergroupsare stored.[1][2]
The SQL standardspecifiesauniformmeanstoaccessthe
Q.4 Explainsemantics of TRC querieswith examples.
Answer:- semantics of TRC queries:- Tuple calculus is a calculus that wasintroduced by Edgar F. Codd as
part of the relational model, in order to provide a declarative database-query language for this data
model. It formed the inspiration for the database-query languages QUEL and SQL, of which the latter,
although far less faithful to the original relational model and calculus, is now the de-facto-standard
database-query language; a dialect of SQL is used by nearly every relational-database-management
system.Lacroix andPirotte proposeddomain
5. Explaindata fragmentationwith an example.
ANSWER : Data fragmentation occurs when a collection of data in memory is broken up into many
pieces that are not close together. It is typically the result of attempting to insert a large object into
storage that has alreadysufferedexternal fragmentation.
For example, files in a file system are usually managed in units called blocks or clusters. When a file
systemiscreated,there isfree space tostore file](https://image.slidesharecdn.com/bt0066dbms-150530112753-lva1-app6891/85/Bt0066-dbms-2-320.jpg)
Bt0066 dbms
- 1. Dear students get fully solved assignments Send your semester & Specialization name to our mail id : “ help.mbaassignments@gmail.com ” or Call us at : 08263069601 Assignment PROGRAM B.Sc IT SEMESTER FIRST SUBJECT CODE & NAME BT0066-Database ManagementSystems CREDIT 3 BK ID B0950 MAX.MARKS 60 Note – Answerall questions.Each questionis followedbyevaluationscheme. Q1. Explainentityand attributesin E-R diagram. Explainthe importance of E-R diagram. Answer: - Entity in E-R diagram:- An entity is something that exists in itself, actually or hypothetically. It need not be of material existence. In particular, abstractions and legal fictions are usually regarded as entities.Ingeneral,there isalsonopresumptionthatanentityisanimate. Sometimes, the word entity is used in a general sense of a being, whether or not the referent has material existence,e.g.,isoftenreferredtoasan Q2. Whyrelational data model is important? Explainthe terms relationand tuple. Answer:- Important of Relational data model:- The relational model for database management is a database model based on first-order predicate logic, first formulated and proposed in 1969 by Edgar F.
- 2. Code. In the relational model of a database, all data is represented in terms of tuples, grouped into relations.A database organizedintermsof the relationalmodel isarelational database. Diagram of an example database according to the Q.3 What is the system catalog in RDBMS? Also explain what information is stored in the system catalog. Answer:- system catalog in RDBMS: The database catalog of a database instance consists of metadata in which definitions of database objects such as base tables, views (virtual tables), synonyms, value ranges, indexes,users,andusergroupsare stored.[1][2] The SQL standardspecifiesauniformmeanstoaccessthe Q.4 Explainsemantics of TRC querieswith examples. Answer:- semantics of TRC queries:- Tuple calculus is a calculus that wasintroduced by Edgar F. Codd as part of the relational model, in order to provide a declarative database-query language for this data model. It formed the inspiration for the database-query languages QUEL and SQL, of which the latter, although far less faithful to the original relational model and calculus, is now the de-facto-standard database-query language; a dialect of SQL is used by nearly every relational-database-management system.Lacroix andPirotte proposeddomain 5. Explaindata fragmentationwith an example. ANSWER : Data fragmentation occurs when a collection of data in memory is broken up into many pieces that are not close together. It is typically the result of attempting to insert a large object into storage that has alreadysufferedexternal fragmentation. For example, files in a file system are usually managed in units called blocks or clusters. When a file systemiscreated,there isfree space tostore file
- 3. 6. Describe the approaches for incorporating object orientationcapabilitiesindatabases. ANSWER : Computer sciences has gone through several generation of database management starting with indexed files and later, network and hierarchical data base management systems (DBMS).More recently, relational DBMS revolutionised the industry by providing powerful data management capabilities based on few simple concepts. Now, we are on the verge of another generation of database systemcalledObjectorientedDBMSbasedon Dear students get fully solved assignments Send your semester & Specialization name to our mail id : “ help.mbaassignments@gmail.com ” or Call us at : 08263069601