vähemuutuvad

Vähemuutuvad is an Estonian term that translates to "slow-changing" or "slowly changing" in English. It is commonly used in the context of data management and database design to describe data that does not frequently alter its values over time. This contrasts with volatile data, which is updated or modified regularly.

In data warehousing, the concept of slowly changing dimensions (SCDs) is a fundamental technique for handling attributes that change over time within a dimension table. Vähemuutuvad data is often the subject of these SCD strategies. For example, a customer's address might be considered vähemuutuvad if it typically remains the same for extended periods, but occasionally needs to be updated.

Different types of SCDs exist to manage vähemuutuvad data. Type 1 overwrites the old value with the new one, effectively losing historical data. Type 2 adds a new record for each change, preserving the history. Type 3 uses a limited number of columns to track a fixed number of previous values. The choice of SCD type depends on the business requirements for tracking historical changes in vähemuutuvad attributes. Understanding the nature of vähemuutuvad data is crucial for designing effective data models that accurately represent business processes and enable meaningful analysis.