Data Warehousing Tutorial Last Updated : 19 Mar, 2025 Comments Improve Suggest changes Like Article Like Report Data warehousing refers to the process of collecting, storing, and managing data from different sources in a centralized repository. It allows businesses to analyze historical data and make informed decisions. The data is structured in a way that makes it easy to query and generate reports.A data warehouse consolidates data from multiple sources.It helps businesses track historical trends and performance.Facilitates complex queries and analysis for decision-making.Enables efficient reporting and business intelligence.Data WarehousingIntroduction to Data WarehousingData WarehousingCharacteristics of Data WarehousingData Warehouse vs DBMSComparison of Operational and Informational SystemsData Warehouse ArchitectureData Warehouse ArchitectureThree - Tier ArchitectureData MartsData LakeDifference between Data Mart, Data Lake, and Data WarehouseOLAP TechnologyOLAP in Data WarehousingOLAP vs OLTPETL ProcessETL vs ELTOLAP OperationsTypes of OLAP SystemsMOLAP (Multidimensional OLAP)ROLAP (Relational OLAP)HOLAP (Hybrid OLAP)ROLAP vs MOLAPDifference between ROLAP, MOLAP and HOLAPOLAP ImplementationData Warehouse ModelingIntroduction to Data Warehouse ModelingMultidimensional Data ModelFact TableDimension TableFact Tables vs Dimension TablesData Warehouse Schema ModelsStar SchemaSnowflake SchemaStar Schema vs Snowflake SchemaConcept HierarchyData TransformationIntroduction to Data TransformationTypes of Data TransformationData NormalizationAggregationDiscretizationData SamplingHandling Missing ValuesHandling OutliersFeature SelectionFeature ExtractionDifference between Feature Selection and Feature ExtractionDimensionality ReductionMiscellaneous TopicsMeasures - Categorization and ComputationData Warehouse ImplementationPerformance Optimization in Data WarehousingData Warehouse Tools and Technologies Comment More infoAdvertise with us Next Article Data Warehousing Tutorial R realravipal27 Follow Improve Article Tags : DBMS Data Warehouse GATE Computer Science and Engineering GATE DA +1 More Similar Reads Data Warehousing Security Data warehousing is the act of gathering, compiling, and analyzing massive volumes of data from multiple sources to assist commercial decision-making processes is known as data warehousing. The data warehouse acts as a central store for data, giving decision-makers access to real-time data analysis 7 min read Data Warehousing A data warehouse is a centralized system used for storing and managing large volumes of data from various sources. It is designed to help businesses analyze historical data and make informed decisions. Data from different operational systems is collected, cleaned, and stored in a structured way, ena 10 min read History of Data Warehousing The data warehouse is a core repository that performs aggregation to collect and group data from various sources into a central integrated unit. The data from the warehouse can be retrieved and analyzed to generate reports or relations between the datasets of the database which enhances the growth o 7 min read Last Minute Notes (LMNs) - Data Warehousing A Data Warehouse (DW) is a centralized system that stores large amounts of structured data from various sources, optimized for analysis, reporting, and decision-making. Unlike transactional databases, which handle daily operations, a data warehouse focuses on analytical processing. This article cove 15+ min read Data Loading in Data warehouse The data warehouse is structured by the integration of data from different sources. Several factors separate the data warehouse from the operational database. Since the two systems provide vastly different functionality and require different types of data, it is necessary to keep the data database s 5 min read Like