A logical data model (LDM) is a type of model which describes various data elements in detail. This is most often used to develop different attributes related to the visual understanding of data entities along with their keys and relationships. These models represent the conceptual understanding between the objects and related rules.
The working of logical data models can be understood as the “process of developing a visual representation of either an entire data network or portions of it to transmit connections between data points and the structures.”
It is unrestricted of the manual database that features how the data will be executed. The logical data model assists as a strategy for users of the data.
Components of data models are:
- Entities: Each entity denotes a set of elements, individuals, or ideas applicable to a business.
- Relationship: Every relationship illustrates an establishment between two of the above entities.
- Attributes: Each attribute is an explanatory article, element, or any other input that is beneficial to define further an entity.
Each of the above components is further implied by a textual definition and a name. These will serve as rules which outline the required information.
The Need for a Logical Data Model is:
It is known that data symbolizes the most important characteristic of any application, quality data processing, program, or system and storage systems must be created upon a powerful and valid underlying data hierarchy. A sound data structure provides application designers the independence to develop the best feasible user interface, processing system, or statistical examination and documented format. Visit www.valueblue.com to know more.
Meeting the requirements, following rules, and most importantly serving the purpose of the business or enterprise is the main motive behind the data model else it is of no practical use. Hence, logical data modeling fulfill the two important requirements that are:
- Business requirements
- Quality data structure
There are three data models
- Conceptual Data Models
- Logical Data Models
- Physical Data Models
- Logical Data Models
A logical data model performs to specify how the system has to be executed nonetheless of the database management system being used. Data developers and business reviewers are usually the founders of a logical data model. The purpose of founding a logical data model is to formulate a highly specialized plan of essential requirements and data hierarchies.
Advantages of Logical Data Models are:
- As data stays durable over time, a logical data model is also a stable one and facilitates data re-use opportunity and real data sharing, which eventually guides in lowering redundancy of data.
- Elements of a logical data model can be modified, reused, and can be changed by the teams as per their changing requirements.
- Costs related to developing and retaining a logical data model are equalized in the long run by the benefits it gives, not even tiniest by recognizing and combining all business needs and rules at the beginning.
- Possessing a logical data model in position gives rise to work easier, and hence cost-beneficial, to formulate alterations, rectify errors, or join omitting data during the improvement life cycle itself before the performance.
- The user’s recommendations for bringing alterations can be undervalued by being visionary.
- Logical data models can be utilized for effect estimation, as each industry has its process plus the rule is bound within it.
- As subjects in the logical data model assume textual descriptions in business terminology, it gives rise to it being easier to retain and access network documentation.
Therefore, involving logical data modeling allows data analysts to understand without any assistance to know the latest technology and focus on the enhancement of business processes. A logical data model must be created as an important and unforgettable element of all application development projects. It plays a significant role in a stepping up ideally that precedes database design.