Data Modeling: Keys for you to learn their techniques and concepts
A well-designed data model is key to effective operational systems, as well as BI and analytics applications that deliver business value by transforming enterprise data into a useful information asset.
We look at what data modeling is, its applications and benefits, as well as tips on how to use it in your business.
What is Data Modeling?
Data modeling is the process of analyzing and defining the different types of data a company collects and produces, as well as the relationships between them. Whether through text, symbols and diagrams, data modeling concepts create visual representations of data as it is captured, stored and used in the enterprise.
Data models are built based on business needs, and rules and requirements are defined in advance through stakeholder feedback, with the goal of being able to be incorporated into the design of a new system or adapted in the iteration of an existing one.
By modeling data, it is possible to document what type of data we have, how we use it, and the requirements for managing it in terms of its use, protection,n and governance. Therefore, some of its advantages include:
- Creating a collaborative structure between your IT and business teams.
- Revealing opportunities to improve business processes by defining data needs and uses.
- Saving time and money on IT and process investments through proper planning.
- Reduce errors (and error-prone redundant data entry) while improving data integrity.
- Increase the speed and performance of data retrieval and analysis through capacity planning and growth.
- Establish and track key performance indicators tailored to business objectives.
Therefore, when we talk about data modeling, the ideal scenario of data models would be living documents that evolve along with the changing business needs.
Data Modeling Examples
Data modeling has evolved along with database management systems, and the complexity of the types of models has increased as the data storage needs of enterprises have grown.
Let’s review some examples of data modeling:
Conceptual Data Modeling
This type defines the overall structure of a company’s business and data. It is used to organize business concepts and is defined by stakeholders and data engineers or architects. Therefore, both the entities and their relationships are defined within the conceptual data model.
Logical Data Modeling
It is based on the conceptual data model, with specific attributes of the data within each entity and the relationships between those attributes.
It is the technical model of data rules and structures, defined by data engineers, architects, and business analysts, which helps to make decisions about the physical model required by the data and the business.
Modeling of Physical Data
This is the specific implementation of the logical data model created by database administrators and developers. It is developed for a specific database tool and data warehousing technology, and has data connectors to distribute data to business system users as needed.
In fact, this is the target at which the other models have been aimed: the actual implementation of the data estate.
Data modeling tools
To better understand the most popular modeling techniques today, it is also necessary to review the first ones that were used at the beginning of databases. These are the first four that we describe below, followed by the three most used today.
Hierarchical data model
In this case, the data is stored in a tree structure with parent and child records that make up a collection of data fields. A parent can have one or more children, but a child record can only have one.
In addition, this model also consists of links, which are the connections between records, and types that specify the type of data contained in the field. It was very popular in the 1960s.
Data network model
This model extended the hierarchical model by allowing a child record to have one or more parents. This network technique is a precursor to a graph data structure, with a data object represented within a node and the relationship between two nodes called an edge.
This model had its heyday in the 1970s.
Relational data modeling
With this model, data is stored in tables and columns, and the relationships between their elements are identified. In addition, database management functions, such as constraints and triggers, are incorporated in this model.
It became the most popular technique in the 1980s and the entity-relational and dimensional data models, the most popular at the time, are variations of the relational model.
Object-oriented data model
This model combines aspects of object-oriented programming and the relational data model.
An object represents data and its relationships in a single structure, along with attributes that specify its properties and methods that define its behavior. These can have multiple relationships with each other.
The model also consists of classes and inheritance, and emerged in the early 1990s.
Entity-relationship data model
It is one of the most widely adopted relational databases in enterprise applications, especially for transaction processing. It is very efficient for data capture and updating processes.
It consists of entities representing people, places, things, events, or concepts, attribute,s and relationships. In addition, it is characterized by the degree of normalization, i.e. the level of redundancy implemented.
Dimensional data model
Like the previous one, it consists of attributes and relationships, but also of facts and dimensions.
This model has been widely adopted in business intelligence and analysis applications. In fact, it is known as a star schema because it can be visualized as a fact surrounded and connected to multiple facts, although this simplifies the structure of the model.
Most of these types of models have numerous fact tables linked to various dimensions, which are called “conformal” when they are shared by more than one fact table.
Graphical data model
It has its roots in the network modeling technique, and is mainly used to model complex relationships in graph databases. Although it can also be used for other NoSQL databases, such as key-value and document databases.
In this model there are two fundamental elements: nodes, which represent entities with a unique identity, and edges, which connect nodes and define how they relate to each other.
Data Vault Modeling
The Data Vault is a methodology for structuring and modeling data in a Data Warehouse in an agile and scalable way.
One of the most prominent benefits of this technique is that it allows organizations to maintain a broad view of their data while easily adapting to changes in business and technology. But that’s not all.
The Data Vault architecture consists of 3 main components:
- Hub: is a central table containing a single list of all business objects and their attributes.
- Links: tables that are used to relate two or more hubs.
- Satellite: a table containing detailed information about a particular business object at a specific point in time.
This approach provides a scalable and change-resilient data architecture, allowing the integration of new data sources without having to redo the entire data modelling.
Unlike other data models, Data Vault modelling focuses on data traceability and auditability, allowing full change logging and the ability to track the provenance of each piece of data.
In addition, its process is iterative, so it can be refined and improved as new data is added and new needs are discovered. Therefore, its main advantages lie in its scalability, flexibility, and complete data history.
Implementing Data Vault in a data warehouse requires a strategic approach and careful planning. Hence, before we start, we must identify the business objectives and data requirements. It is very important to understand the business objectives and data requirements to ensure that the needs of the organisation are being met.
How do you scale large Data Warehousing projects?
DBT Core and Data Vault 2.0 are crucial to scaling data warehousing solutions for several key reasons:
- Scalability and flexibility: Data Vault 2.0 is designed to handle large-scale data warehousing projects, integrating data from multiple sources and ensuring long-term data storage. Its modular structure, consisting of hubs, links, and satellites, allows for easy expansion and adaptation to changing business needs.
- Audit and compliance: Data Vault 2.0 ensures data integrity and traceability, essential for regulatory compliance. It maintains historical data, allowing you to track changes over time and audit data transformations.
- Agile development: DBT Core improves the development process by enabling data transformations directly within the data warehouse. It supports version control, automated testing, and continuous integration, which streamlines the development workflow and improves collaboration between data teams.
- Performance optimisation: DBT Core enables efficient data processing by harnessing the power of modern cloud data warehouses. It uses SQL and reusable macros to optimise data transformations, reducing the time and resources required for data processing.
- Cost-effective: By using DBT Core, organisations can minimise the costs associated with data warehousing. Provides detailed control of data transformations, enabling cost-effective management of data warehousing and processing.
In summary, the combination of DBT Core and Data Vault 2.0 provides a robust framework for creating scalable, flexible, and efficient data storage solutions that can adapt to evolving business requirements and ensure data integrity and regulatory compliance.
How to modernise your enterprise data platform?
By maintaining an up-to-date data platform, you ensure that your organisation remains competitive, secure, and able to take advantage of the latest technological advances to drive business success.
- Optimised data processing and performance: Modern data platforms leverage the latest technologies to improve data processing speed and overall performance. This ensures that large data sets can be processed efficiently, reducing latency and improving the responsiveness of data-driven applications.
- Seamless data integration and interoperability: Modern platforms are designed to integrate seamlessly with a wide range of data sources and systems. This interoperability enables a unified view of data across the organisation, facilitating better decision-making and more comprehensive analysis.
- Advanced analytics capabilities: By modernising your data platform, you can take advantage of advanced analytics tools, including machine learning and artificial intelligence. These capabilities enable deeper insights, predictive analytics, and more sophisticated data models, driving innovation and competitive advantage.
- Enhanced security and compliance: Modern data platforms come equipped with robust security features and compliance frameworks. This ensures that your data is protected from breaches and that your organisation meets regulatory requirements, reducing risk and increasing confidence.
- Cost efficiency and resource optimisation: Modernising your data platform can lead to significant cost savings. Cloud-based solutions, for example, offer flexible pricing models and the ability to scale resources up or down based on demand, optimising costs and improving resource utilisation.
Data modelling is a major business challenge. At Plain Concepts, we have extensive experience in combining Data Vault 2.0 methodology with tools such as DBT Core on data platforms such as Databricks and Snowflake.
Specifically with Snowflake, we have solutions running on Container Instance orchestrated by Ariflow, solutions with much more demanding scaling needs with Argo and Kubernetes, and finally, we are exploring the capabilities of Snowpark Containers, which allows us to simplify the final architecture, and we will tell you soon in another article. Do not wait any longer and start making the most of your data!
