Define the term Database Schema

1 Answer

Answer :

The overall design of the database is called the database schema. A schema diagram displays only names of record types (entities) and names of data items (attributes) and does not show the relationships among the various files. 

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Description : Define database model. 

Last Answer : Definition of database model: A database model is a type of data model that determines the logical structure of a database. It also fundamentally determines in which manner data can be stored, organized and manipulated. 

Description : Define Database. List advantages of database system. 

Last Answer : A database is an organized collection of data so that it can be easily accessed, managed and updated. Advantages of database system are the following:  1. Controlling ... Providing Backup and Recovery facilities is provide by DBMS for recovering from hardware or software failures.

Description : Can one rename a database user (schema)? (for DBA)

Last Answer : No, this is listed as Enhancement Request 158508. Workaround: Do a user-level export of user A create new user B Import system/manager fromuser=A touser=B Drop user A

Description : A logical schema A. is the entire database B. is a standard wayof organizing information into accessible parts C. describes how data is actually stored on disk D. All of theabove E. None of the above

Last Answer : is a standard wayof organizing information into accessible parts

Description : How do you collect statistics for a table, schema and Database?

Last Answer : Using DBMS_STATS package to gather Oracle dictionary statistics.

Description : Anything that affects the database schema is a part of A) DML B) DCL C) DDL D) All of the above

Last Answer : D) All of the above

Description : A logical schema A) is the entire database B) is a standard way of organizing information into accessible parts. C) Describes how data is actually stored on disk. D) All of the above

Last Answer : B) is a standard way of organizing information into accessible parts.

Description : A top-to-bottom relationship among the items in a database is established by a A) Hierarchical schema B) Network schema C) Relational Schema D) All of the above

Last Answer : A) Hierarchical schema

Description : The database schema is written in (A) HLL (B) DML (C) DDL (D) DCL

Last Answer : (C) DDL

Description : A Network Schema (A) restricts to one to many relationship (B) permits many to many relationship (C) stores Data in a Database (D) stores Data in a Relation

Last Answer : (B) permits many to many relationship

Description : Consider the following two commands C1 and C2 on the relation R from an SQL database:  C1: drop table R; C2: delete from R; Which of the following statements is TRUE? I. Both C1 and C2 delete the schema for R. II. C2 ... R. (A) I only (B) I and II only (C) II and III only (D) I, II and III

Last Answer : (C) II and III only

Description : Relational database schema normalization is NOT for: (A) reducing the number of joins required to satisfy a query. (B) eliminating uncontrolled redundancy of data stored in the database. (C) ... could otherwise occur with inserts and deletes. (D) ensuring that functional dependencies are enforced. 

Last Answer : reducing the number of joins required to satisfy a query.

Description : DBMS provides the facility of accessing data from a database through (A) DDL (B) DML (C) DBA (D) Schema 

Last Answer : (B) DML

Description : Explain three level architecture of Database

Last Answer : There are following three levels or layers of DBMS architecture: External Level : Describes part of the database that a particular user group is interested in. Conceptual Level: Describes structure of ... is the one that concerns the way the data are physically stored on the hardware.

Description : State characteristics of Database.

Last Answer : The Characteristics of Database are: 1. Persistent Data 2. Meta Data and Self-describing nature of a DB 3. Insulation between programs and data (Data Independence) 4. Support ... Sharing of data and multiuser transaction processing 6. Access flexibility and Security. 7. Controlled Redundancy

Description : List types of Database languages.

Last Answer : Four types of database languages are: 1. DDL (Data Definition Language) 2. DML (Data Manipulation Language) 3. DDL (Data Control Language) 4. TCL (Transaction control language)

Description : Describe centralized database system with example. 

Last Answer : Centralized Database System: 1. A centralized database consists of a single data server into which all data are stored and from which all data are retrieved. All the data reside at a single location and ... is cheaper than other types of databases as it requires less power and maintenance. 

Description : Explain client/server database system. 

Last Answer : 1. It has two logical parts client and server.  2. Computer networking allows some task to be executed on a server system and some tasks on client system. This leads to development ... as application server to receive and send requests from client machine to database server and vice versa.

Description : Compare file system and database system. 

Last Answer : File system Database system  1. File processing don't contain any self describing feature and neither posses metadata.  1. Presence of Self-describing nature of a database system and Metadata. ... own file.  5. Controlling Redundancy is one of most important feature to use DBMS

Description : Distinguish between network database model and relational database model. 

Last Answer : Network database model Relational database model Relationship between records is expressed in the form of pointers or links Relationship between records is represented by a relation that contains a key for ... logically in the form of rows and columns. Example:  Example: 

Description : Explain distributed database system with example.

Last Answer : A distributed database is a database that consists of two or more files located in different sites either on the same network or on entirely different networks. Portions of the database ... Ignite, Apache Cassandra, Apache HBase, Couchbase Server, Amazon SimpleDB, Clusterpoint, and FoundationDB

Description : Explain merits and demerits of Object Oriented Database model.

Last Answer : Object oriented models were introduced to overcome the shortcomings of conventional models like Relational, Hierarchical and network model. An object-oriented database is collection of objects whose behavior, state, ... . * There is no view mechanism * There is no adequate security mechanism.

Description : Differentiate between Hierarchical Database model and network database model.

Last Answer : Hierarchical Database Model  Network Model Network Model represents tree like structure with one root. Network Model represents tree like structure with many roots. Reflects 1:N ( ... the use of pointers Record relationship implementation is complex due to the use of pointers

Description : Explain components of database in detail.

Last Answer : A database system involves four major components. 1. Data 2. Hardware 3. Software 4. Users

Description : Explain three tier architecture of database with the help of diagram.

Last Answer : Application server or Web server *Adds intermediate layer between client and the database server *Runs application programs and stores business rules Clients contain GUI interfaces and ... GUI format. Thus the user interfaces, application rules and the database acts as three tier. 

Description : Define the term Foreign Key. 

Last Answer : A FOREIGN KEY is a key used to link two tables together. A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table. It ... between tables because it references the primary key of another table, thereby establishing a link between them.

Description : Define the term Data Model.

Last Answer : Underlying structure of the database is called as data model. It is a collection of conceptual tools for describing data, data relationships, data semantics and consistency constraints. Data models define how data is connected to each other and how they are processed and stored inside the system.

Description : Define the term tuple and domain.

Last Answer : tuple: A row is called a Tuple. domain:A domain is a set of all possible (or permissible) values in an attribute. OR  A Domain is defined as a kind of data represented by an attribute.

Description : Define Constraint. 

Last Answer : Constraints are the rules enforced on the data columns of a table. These are used to limit the type of data that can go into a table. This ensures the accuracy and reliability of the data in ... are applied only to one column, whereas the table level constraints are applied to the whole table. 

Description : Define Domain and Attribute. 

Last Answer : * Domain: All permissible values of attributes are called as a domain. * Attribute: is a property or characteristics of an entity set. 

Description : Define Normalization, list its types.

Last Answer : Normalization is a systematic approach of decomposing tables to eliminate data redundancy(repetition) and undesirable characteristics like Insertion, Update and Deletion Anomalies. It is a multi-step process that ... data from the relation tables. Types of Normalization are: 1NF,2NF,3NF,4NF,5NF

Description : Define Data and instance.

Last Answer : Data: Data can be defined as facts or information that can be recorded and have an implicit meaning.  Instance: The collection of information stored in the database at a particular moment is called an instance of the database.

Description : Define constraints, list types.

Last Answer : Constraints are used to limit the type of data that can go into a table. Constraints are used to ensure accuracy and consistency of data in a relational database.  Types of Constraints : ... Constraint 3.UNIQUE Constraint 4.CHECK Constraint 5.Primary Key Constraint 6. Foreign Key Constraint

Description : Define primary key and candidate key.

Last Answer : Primary Key: A primary key is an attribute in Relation that uniquely identifies the rows in relation. A Primary key does not hold NULL values and duplicate values.  OR A key which is selected by the ... , Name) can be a candidate key if and only if Name and Rollno individually are not unique. 

Description : Define (i) Data Abstraction, (ii) Data Redundancy.

Last Answer : Data abstraction is defined as  *Suppression of details of data organization and storage  *Highlighting of the essential features for an improved understanding of data  *The characteristic that allow ... of data abstraction. This level describes the user interaction with database system. 

Description : How can I dump an oracle schema to a LOCAL file over a network connection from sqlplus?

Last Answer : By connecting and spooling are you excluding the exp/imp commands (or expdb/impdb in 10g)?

Description : A set of predefined formats of text or color scheme is called ………………. (a) slide (b) presentation scheme (c) theme (d) schema -Technology

Last Answer : (c) A set of predefined formats of text or color scheme is called theme.

Description : Give the two types of tables involved in producing a star schema and the type of data they hold.

Last Answer : Fact tables and dimension tables. A fact table contains measurements while dimension tables will contain data that will help describe the fact tables.

Description : What is schema?

Last Answer : A schema is collection of database objects of a User.

Description : What is a Schema ?

Last Answer : The set of objects owned by user account is called the schema.

Description : Can objects of the same Schema reside in different tablespaces.?

Last Answer : Yes.

Description : Can objects of the same schema reside in different tablespaces?

Last Answer : Yes.

Description : What are Schema Objects?

Last Answer : Schema objects are the logical structures that directly refer to the database's data. Schema objects include tables, views, sequences, synonyms, indexes, clusters, database triggers, procedures, functions packages and database links.

Description : What is schema?

Last Answer : A schema is collection of database objects of a user.

Description : Goals for the design of thelogical schema include A. avoiding data inconsistency B. being ableto construct queries easily C. being ableto access data efficiently D. All of theabove E. None of the above

Last Answer : All of theabove

Description : In order to use a DBMS, it is important to understand A. the physical schema B. all sub-schemas that thesystem supports C. one subschema D. both (a)and (b) E. None of the above

Last Answer : one subschema

Description : In contrast, the contract-first approach encourages you to think of the service contract first in terms of :- a) XML b) XML Schema(.xsd) c) WSDL d) All of the mentioned

Last Answer : All of the mentioned

Description : What is schema?

Last Answer : A schema is collection of database objects of a User

Description : Can objects of the same Schema reside in different tablespaces? –

Last Answer : Yes.

Description : What is a Relation Schema and a Relation?

Last Answer : A relation Schema denoted by R(A1, A2, …, An) is made up of the relation name R and the list of attributes Ai that it contains. A relation is defined as a set of tuples. Let r be the relation which contains set tuples (t1, t2, t3, …,tn). Each tuple is an ordered list of n-values t=(v1,v2, …, vn).