What is a Data
Warehouse?
Data Warehouse is a database
management system that collects and manages data from various sources and
allows business intelligence and data analytics. It is a centralized and
consolidated massive amount of data from multiple sources and helps derive
business insights to enhance business decisions. Data Warehouse is intended to
perform queries and analysis on data obtained from various sources such as log
files and transaction applications.
Features of Data Warehouse
Data Warehouse provides unique features for organizations to analyze large amounts of data. The features of Data Warehouse are as follows:
- Integrated: Data Warehouse helps integrate the data from various sources such as files, transaction records, and RDBMS into a consistent form used for effective data analysis. The data available in the Data Warehouse should be analyzed and stored in the form of naming, coding, and formatting.
- Non-Volatile: The data stored in the Data Warehouse should be in a Read-only form and should not be allowed to change. The Non-volatile data warehouse does not enable operational data updates such as updating, deleting, and inserting data in the Data Warehouse.
- Subject-oriented: A subject-oriented data warehouse is designed to provide topic-wise information rather than the overall processes of a business. It often offers a clear and concise view of a specific topic, such as a customer, a product, or sales, as opposed to the ongoing activities of the entire firm.
- Time-Variant: The data in the Data Warehouse is stored as a time variance that helps retrieve data from elements of time such as a week, month, or year.
Types of
Data Warehouse
The Data Warehouse is of three types as follows:
- Data Mart: Data Mart is a subgroup of a data warehouse that is designed to focus on business operations such as marketing, finance, sales, etc. The data from the data mart is stored in the Operational Data Store (ODS), which is sent to Enterprise Data Warehouse (EDW). The data is collected directly from various sources for an Independent Data mart.
- Enterprise Data Warehouse: EDW is a centralized Warehouse used to provide support services over the enterprise. It provides a unified approach for data representation and allows the execution of complex queries.
- Operational Data Store: ODS is a real-time data warehouse mainly used to store employee records. It supports organizational report requirements.
Benefits
of using Data Warehouse
The following are the benefits of using Data Warehouse:
- Enhance business decisions
- Analyze a large amount of data collected from various sources
- Provides relevant information on cross-functional activities
- Easy access to data from various sources in one place
- Minimize the analysis and reporting time
- Understands the business trends and provides better solutions
- Analyze and organize the historical data
- Provides ad-hoc queries and reports without affecting the business operations
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