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A logical data group is a set of related data elements treated as one meaningful unit. In data modeling, the National Wildfire Coordinating Group (NWCG) says these groups are commonly known as entities in a logical data model. The phrase has a separate, narrower meaning in IBM Db2 monitoring, so its context matters.
What does “logical data group” mean in data modeling?
The NWCG’s Data Management Strategy defines a logical data group as “a logical grouping of data elements that belong together,” and says these groupings are commonly known as entities in a logical data model. In practical terms, a model might represent a customer or an incident as an entity, with related attributes describing that subject.
The emphasis is on the meaning and relationship of the elements, not on where or how they are physically stored. A logical data group does not, by itself, require a particular database table, file, or storage layout. The implementation depends on the model and the system built from it.
Is a logical data group the same as an entity?
In the NWCG terminology, logical data groups are commonly known as entities in a logical data model. That is a useful equivalence within this framework, not a guarantee that every organization, standard, or product uses the phrase the same way.
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NWCG also defines a separate term, Business Data Group: data elements that provide more complete information or knowledge when viewed together than they do individually. The strategy notes that such groupings may help identify mandatory data for business processes. Because the source treats it as a distinct term, do not assume “Business Data Group” and “logical data group” are interchangeable.
What does “logical data group” mean in IBM Db2?
In IBM’s Db2 12.1 glossary, a logical data group is a collection of data elements used to gather database-system monitoring information for a specific scope of database activity. Snapshot monitors and event monitors have their own logical data groups.
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This is a product-specific monitoring meaning, rather than the general data-modeling meaning of an entity. If the surrounding documentation mentions Db2, snapshot monitors, or event monitors, read the term in that monitoring context.
How can you tell which meaning applies?
| Context | What the group represents | Clues in the surrounding text |
|---|---|---|
| Logical data modeling, as described by NWCG | Related elements that form a logical entity in a model | Entities, attributes, business subject areas, or a logical data model |
| IBM Db2 monitoring | Elements used to gather monitoring information for a particular activity scope | Db2, snapshot monitors, or event monitors |
The phrase alone is not enough to identify the definition. Use the source framework or product documentation in which it appears.
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Does a logical data group need a unique key?
No universal key requirement follows from the term. A 1995 network data-dictionary patent describes logical data groups (or entities) as significant things about which information is kept, composed of data elements and associated with a uniquely identifying key. That is an example from the patent’s data-dictionary design, not a general requirement for every logical data group. See the description in U.S. Patent 5,418,957.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is the core idea behind a logical grouping?
A logical grouping describes information according to its meaning or use. The U.S. Department of Defense’s DM2 information-and-data discussion likewise emphasizes describing information semantically in the user’s or operator’s frame of reference. That helps explain why a logical grouping is about what the data represents, rather than a mandatory physical arrangement.
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An older functional-size measurement paper, E&Q: An Early & Quick Approach to Functional Size, also describes an LDG as logical attributes representing a conceptual entity that is functionally significant to the user. This supports the user-meaningful aspect of the idea, but it is an older measurement source, not a current universal definition.
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