The Difference In Data Warehouse and Data Mart

Everyone has heard of Data and is aware of its significance in our modern world. Let's talk about it further. In essence, there is initial raw data defined as information in its simplest form. When raw data is present, it is processed, and the data is converted into knowledge. This processed data is analyzed and utilized at various levels to make decisions. For a business or a company, data is the most important thing. It's possible to start, but it won't sustain itself on the market without it. The company's data assists it in analyzing its or employee's performance, making itself stand against competitors, and making choices.

As we've learned how crucial data is, we will look at how information is stored to be processed and analyzed at the company level. Companies utilize Data Warehouse and Data Mart to store their data. Data warehouses are the database that contains the data of all departments in the company. A data mart is the data warehouse that holds a particular department's data. There are a variety of data marts by departments. Both are similar, but they are utilized for different reasons. The primary difference is Data Warehouse is data-oriented. However, Data Mart is project-oriented in the heart. 

Related posts

What programming language should I learn? A How-to Guide towards SQL, Python & More

How Shopee Becomes the top eCommerce marketplace for southeast Asia

What is a Data Warehouse?

It's a set of information distinct from operational systems and aids in the business's decision-making. For instance, a company has several departments, such as Finance, Sales, HR Marketing, HR. Through connecting and modeling, the data experts in data analytics could aid employees from all departments to improve customer experience, boost sales, handle finance, and so on. Data warehouses companies store their data to access all the information from the past and perform analytics over it. It's an essential element of a data analysis architecture, which can help provide a platform that supports analytics, decision support business intelligence, data mining.

For instance, suppose that various data sources contain Transactions and CRM information, Flat files, which we can see in the previous image. This data will be saved in the staging zone where the ETL process is carried out. ETL is a reference to Extract, Transform and Load.

What Is a Data Warehouse?, Sourcw: Youtube, 365 Data Science 

  • Extract: Information from various data sources is extracted and put in the storage area.
  • Transform in the staging area: Data transformation occurs according to the business needs such as sorting, filtering, eliminating duplicates, etc.
  • Load: The transformed information is then transferred to the warehouse.

The data warehouse can be viewed as a database integrated with information from various sources. From the database, different types are constructed that are referred to as data marts. They contain data associated with other departments, such as sales and marketing. If a separate analysis needs to be conducted department-wise, it can be analyzed quickly. We will talk more about data marts in the next section.

A data warehouse may be described as:

  • It is a decision-support system for the business. It is a way of organizing and presenting the information. It also allows you to collect data by the specific department or subject within an enterprise.
  • Operational Data Store

What is a Data Warehouse?, Source: Youtube, IBM Technology 

  • Operations Data Store (ODS) are data storage facilities needed when neither the data warehouse nor OLTP systems can meet the needing to report. Therefore, it is utilized for mundane tasks such as keeping records of employees because new employees are constantly adding.
  • Data Mart
  • The data warehouse is an accumulation of data from the database warehouse. It is entirely dependent on the subject. Similar data from different departments may be stored inside data marts.

What exactly is Data Mart?

A Data Mart is a basic version of the Data Warehouse. It is specialized on a particular subject or, as we say, specific to a specific area of a firm (say department ). It includes information from several sources, with data specific to the department. The data can be retrieved from a data mart and then analyzed swiftly due to the small amount of data.

WHAT IS DATA MART?, Source: Youtube, Jelvix

A Data Mart collects data from a small number of sources. The sources could include central data warehouses, internal operational systems, or other data sources. Based on these sources, we can identify the kind of Datamart. Let's look at how to categorize Data marts based on sources.

There are various types of data marts: dependent or independent and hybrid.

Dependent Data marts

They are the subordinates of the giant data warehouse. These are built using the top-down method, which is first to make a data warehouse and create data marts. Dependent data marts work with larger organizations that require greater control over the system's performance.

The Dependent Data Mart can collect data from the warehouse. From that Data Mart, the data can be used to query the data to analyze further. Independent Data marts

Data Marts, Source: Youtube, miral donda

They function as an independent system, i.e., they can be used without a data warehouse. The data it holds is then used to build the data warehouse. This is known as the bottom-up strategy. They are great for medium to small-sized businesses. 

Hybrid Data marts

As the name suggests, they can gather information from databases or straight from data sources.

The following figure shows that the data marts can collect data directly in the Data Warehouse or directly from data sources via the ETL Process.

The Key Differences: Data Warehouse vs. Data Mart

Data Warehouse stores a large quantity of data taken from various sources. In contrast, Data Mart contains only the specific data of the Data Warehouse, which is needed by the business to analyze.

Due to the massive volume of data, performing data operations is highly time-consuming. However, Data marts are more minor in data, so the data operations performed within Data Mart take less time.

The Data Warehouse designing process is complex due to the various kinds of complex data, while the Data Mart designing process is simple. The Data Mart designing process is simple.



Data Warehouse usually has storage between 100 GB and 1TB+, whereas Data Mart has less than 100 GB.

It is estimated that the Data Warehouse implementation process takes one month to a year, whereas Data Mart takes a few months to finish the implementation process. Which is the Implementation procedure? In the process of implementation, first, a database warehouse is planned and built, and then the data is created. It can be accessed and managed according to the requirement.


Data plays an important role all over the world. To make companies make a mark, they must have the proper methods for storing data and require analysis based on various parameters to make decisions at the departmental or organizational level. Data warehouses are the database used to store data from multiple sources from all departments. The Data marts are a kind of database that holds information on a departmental scale. The departmental-related decisions are from data marts, and all organizational levels decisions are made built on a data warehouse.

Related posts

Apple Watch Series 7 review: Bigger screen and faster charging; however, it's the best-performing

5 Tips breakthroughs to increase iOS app installs on App Store

Hope this article is helpful to you, thanks for reading.