Computer Knowledge

Database Management Systems

5,543 Questions

Database Management Systems (DBMS) form the core framework for data storage, retrieval, and security in modern software applications. Concepts such as the E-R model, backup planning, SQL integration, and big data architecture are essential for computer knowledge sections. This hub offers a comprehensive set of practice questions to master DBMS fundamentals and advanced database operations.

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Database Management Systems Questions

Multiple choice technology
  1. Subject-oriented, integrated, current valued and volatile

  2. Process-oriented, integrated, time variant, and non-volatile

  3. Subject-oriented, non-integrated, current valued and volatile

  4. Process-oriented, integrated, current valued and non-volatile

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An Operational Data Store (ODS) is subject-oriented (organized by business subjects), integrated (consistent data), current-valued (contains real-time or near-real-time data), and volatile (data is updated frequently). Unlike data warehouses, ODS systems support operational decision-making with current rather than historical data.

Multiple choice technology
  1. Addresses a specific subject area

  2. Powerful and natural extension of the data warehouse

  3. Interprets and structures data to suit departments’ specific needs

  4. All of the above

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Data marts serve all these purposes: they focus on specific subject areas (A), act as natural extensions to the enterprise data warehouse (B), and structure data to meet specific departmental analytical needs (C). Data marts are subsets of data warehouses designed for particular business units or functions.

Multiple choice technology
  1. Snow Flake

  2. Star

  3. Integrated

  4. A & B

  5. A,B and C

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dimensional modeling primarily uses two schema types: Star schema (central fact table with dimension tables directly connected) and Snowflake schema (normalized dimensions with hierarchical relationships). Integrated schema is not a standard dimensional modeling pattern. The A & B combination correctly identifies the two valid approaches.

Multiple choice technology
  1. 99user.ldif

  2. dse.ldif

  3. db2ldif

  4. des.ldif

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The dse.ldif file contains indexes for attributes in Directory Server configurations. This is the standard configuration file for Oracle Directory Server. Options A (99user.ldif), C (db2ldif - a command), and D (des.ldif - typo) are incorrect.

Multiple choice technology platforms and products
  1. Microsoft Excel

  2. XML databases

  3. SOAP-based Web services

  4. All the above

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Xcelsius Engage can connect to multiple data sources including Microsoft Excel spreadsheets (the most common), XML databases, and SOAP-based Web services. This flexibility allows it to integrate with various enterprise systems and data formats, making it a versatile dashboard tool.

Multiple choice technology
  1. (a) Work baskets are instances of Data-Admin-WorkBasket class

  2. (b) Work lists are instances of Data-Admin-Operator-ID class

  3. (c) Work Pool is an entity to store the work objects where from multiple operators can pick up the work objects and act upon these work objects

  4. (d) Access role objects should not be shared across applications

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This question asks which statement is FALSE. Statement A is true (work baskets are Data-Admin-WorkBasket instances). Statement B is true (work lists relate to operators). Statement D is a general security principle. Statement C claims Work Pool stores work objects, but Work Pool is actually a classification/grouping mechanism, not a storage entity - making C the false statement.

Multiple choice technology web technology
  1. perform authentication

  2. back-up a portal context

  3. load resources into the JNDI

  4. initialize a database connection

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Backing files in portal frameworks serve as initialization and lifecycle management resources. They are commonly used to perform authentication checks when a portlet is accessed, as well as to handle context initialization and cleanup. The other options describe different mechanisms: backing up portal contexts uses different utilities, JNDI resource loading occurs through configuration, and database connections use connection pools or datasources.

Multiple choice technology web technology
  1. segments and profiles

  2. elements and nodes

  3. nodes and resources

  4. types and content

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Content repositories in portal and content management systems store two primary things: content types (definitions, schemas, metadata) and the actual content items (instances of those types). 'Types and content' captures this duality. Segments and profiles relate to personalization, elements and nodes is too generic, and nodes and resources doesn't capture the type definition aspect.

Multiple choice technology
  1. (a) True

  2. (b) False

  3. Sometimes true

  4. sometimes false

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Process Commander (now Pega Platform) is built on an open database architecture that supports multiple database vendors. This allows organizations to use their existing database infrastructure, including Microsoft SQL Server, Oracle Database, and IBM DB2, without being locked into a specific database technology.

Multiple choice technology
  1. (a) Is any set of related work objects

  2. (b) Causes the system to store the instances corresponding to two or more concrete classes that have a common key format in a single database table

  3. (c) Is unrelated to your application’s requirements

  4. none of the above

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A class group in Process Commander enables storing instances of multiple concrete classes with a common key format in a single database table. This is a database optimization technique that reduces table proliferation when classes share similar structure and key patterns. The system can differentiate between instances based on class-specific properties while sharing the underlying storage.

Multiple choice technology web 2.0
  1. Windows

  2. Passport

  3. SQL

  4. Network

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Windows authentication contexts, 'Windows' refers to the integrated Windows authentication scheme which is considered trusted because it uses the domain controller's Kerberos or NTLM authentication. This is built into Windows Server and Active Directory environments. Passport refers to Microsoft Passport (now Microsoft Account), SQL uses database authentication, and Network typically implies unauthenticated network access - these are not trusted authentication methods in the same way as integrated Windows authentication.

Multiple choice technology architecture
  1. This solution has fat clients

  2. This solution has thin clients

  3. There is a good separation of business logic

  4. The solution has good Scalability

  5. There is a poor separation of business logic

  6. The solution has poor scalability

Reveal answer Fill a bubble to check yourself
B,E,F Correct answer
Explanation

This system has thin clients because the business logic resides in the database (PL/SQL), not on clients. However, putting business logic in PL/SQL represents poor separation of concerns - business logic should be in a separate business tier. This also limits scalability since database resources are constrained and PL/SQL doesn't distribute well.