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Questions and Answers
Which of the following best describes operational data?
Which of the following best describes operational data?
Information is processed, organized, or summarized data.
Information is processed, organized, or summarized data.
True
What is a data warehouse?
What is a data warehouse?
A collection of data designed to support management in the decision-making process.
Data warehouse is a collection of data that is ____ oriented.
Data warehouse is a collection of data that is ____ oriented.
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What is the role of a data dictionary?
What is the role of a data dictionary?
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What type of records does a fixed-length file contain?
What type of records does a fixed-length file contain?
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Define a record in the context of database management.
Define a record in the context of database management.
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Which of the following is NOT a type of data architecture mentioned?
Which of the following is NOT a type of data architecture mentioned?
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___ data are stored in each of the data mart.
___ data are stored in each of the data mart.
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What is the significance of the relationship between database transactions and data items?
What is the significance of the relationship between database transactions and data items?
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Study Notes
Data
- Data is raw or isolated facts used to produce information.
- Data can be organized in three layers: operational, reconciled, and derived.
- Operational data is stored in various operating systems within and outside the organization.
- Reconciled data is stored in data warehouses and operational data stores, and is detailed and current.
- Derived data is stored in data marts and is selected, formatted, and aggregated for decision support applications.
Information
- Information is processed, organized, or summarized data.
- Information communicates meaningful messages to recipients for decision-making.
- Data is processed to create information.
- Information reduces uncertainty, reveals alternatives, and influences action.
Data Warehouse
- A data warehouse is a collection of data designed to support management decision-making.
- It is subject-oriented, integrated, time-variant, and non-updatable.
- It supports business intelligence and contains a wide variety of data.
- It focuses on business intelligence, external data, and time-variant data.
- Data warehousing is the process of extracting meaning and information from data assets using data warehouses.
Data Dictionary
- A data dictionary is a mini database management system that manages metadata.
- It documents data elements of a database.
- It is an integral part of the Database Management System (DBMS).
- It stores metadata and information about the database, attribute names, and definitions for each table.
- It stores information about the database schema, physical database design, users, responsibilities, access rights, transactions, applications, relationships, and data items referenced by transactions.
Records
- A record is a collection of logically related fields or data items.
- Each field has a fixed number of bytes and a fixed data type.
- Records are retrieved or updated using programs.
Files
- A file is a collection of related records.
- Records in a file can be of the same type (fixed-length records).
- Records in a file can have different sizes (variable-length records).
Database
- A database is a collection of logically related data stored together to meet the information needs of an organization.
- It is designed to eliminate harmful or unnecessary redundancy.
- It serves multiple applications and is managed by a DBMS.
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Description
This quiz explores the concepts of data, information, and data warehousing. It covers the layers of data organization, the significance of information in decision-making, and the characteristics of data warehouses. Test your understanding of how data transforms into information and its role in business intelligence.
