--- title: Delta Detection (Model Object) description: "Delta Detection (DeltaDetection) decides how the loader compares a source row with the current version of its key: by row hashes or column by column." --- [Skip to content](https://knowledge.bigenius-x.com/delta-detection-model-object#main-content) [Contact us](https://knowledge.bigenius-x.com/kb-tickets/new?hsLang=en) [Go to Customer Portal](https://knowledge.bigenius-x.com/customer-portal?hsLang=en) [![TRI\_Logo\_biGENIUS\_2020\_RGB\_s](https://knowledge.bigenius-x.com/hs-fs/hubfs/Marketing/TRI_Logo_biGENIUS_2020_RGB_s.png?width=150&height=42&name=TRI_Logo_biGENIUS_2020_RGB_s.png)](https://www.bigenius-x.com/) Open main navigation Close main navigation - [Contact us](https://knowledge.bigenius-x.com/kb-tickets/new) - [Go to Customer Portal](https://knowledge.bigenius-x.com/customer-portal) How can we help you? - There are no suggestions because the search field is empty. 1. [biGENIUS-X Knowledge Base](https://knowledge.bigenius-x.com/?hsLang=en) 2. [Generators](https://knowledge.bigenius-x.com/generators?hsLang=en) 3. [Properties](https://knowledge.bigenius-x.com/generators?hsLang=en#properties) # Delta Detection (Model Object) **Applies to** Platform: Microsoft SQL Server · Snowflake · Databricks · Databricks dbt · Fabric Lakehouse · Fabric Warehouse · Oracle Architecture: Data Store · Dimensional · Data Mart Delta Detection (`DeltaDetection`) decides how the loader compares a source row with the current version of its key: by row hashes or column by column. The result decides whether the loader inserts a version, updates the SCD1 terms or does nothing. ### Where to set it Set the property when you [edit a model object](https://knowledge.bigenius-x.com/edit-a-model-object?hsLang=en) of type Store Entity, Entity or Mart Dimension. Data Vault and Stage objects do not offer it. Data Vault satellites always compare [BG\_RowHash](https://knowledge.bigenius-x.com/bg_rowhash?hsLang=en). ### Values and default - `Hash Value Comparison` (default): the loader compares [BG\_RowHashScd1](https://knowledge.bigenius-x.com/bg_rowhashscd1?hsLang=en) and [BG\_RowHashScd2](https://knowledge.bigenius-x.com/bg_rowhashscd2?hsLang=en). Each exists only when the object has terms of that Historization Type. - `Column Comparison`: the loader compares every SCD1 and SCD2 term, NULL-safe for nullable terms. The object has no row-hash columns and no hashing view. The two values can give different results. A hash detects a trailing space or a different letter case. A column comparison follows the comparison rules of the platform. [Change detection and historization](https://knowledge.bigenius-x.com/change-detection-and-historization?hsLang=en) shows an example. ### Interactions With `Column Comparison`, [Load Caching](https://knowledge.bigenius-x.com/load-caching-model-object?hsLang=en) `Hashing` has no effect, because there is no hashing view to store. ### Example A Store Entity on Microsoft SQL Server receives the address `Main Street 3` with a trailing space, after `Main Street 3` was loaded. With `Hash Value Comparison`, the loader starts a new version. With `Column Comparison`, nothing changes, because SQL Server compares the two strings as equal. ### Release differences - Generator 2.0: Delta Detection is a model-object property of Store Entity, Entity and Mart Dimension. - Up to Generator 1.10: Delta Detection was a project property in Project Settings, with the same values and default. The article [Delta Detection (Project)](https://knowledge.bigenius-x.com/delta-detection-project?hsLang=en) describes it. ### Related articles - Reference: [BG\_RowHashScd1](https://knowledge.bigenius-x.com/bg_rowhashscd1?hsLang=en), [BG\_RowHashScd2](https://knowledge.bigenius-x.com/bg_rowhashscd2?hsLang=en), [Historization Type (Term and Relationship)](https://knowledge.bigenius-x.com/historization-type-term-and-relationship?hsLang=en), [Load Caching (Model Object)](https://knowledge.bigenius-x.com/load-caching-model-object?hsLang=en) - See also: [Change detection and historization](https://knowledge.bigenius-x.com/change-detection-and-historization?hsLang=en), [How biGENIUS-X builds hash values](https://knowledge.bigenius-x.com/how-bigenius-x-builds-hash-values?hsLang=en) - [Getting started](https://knowledge.bigenius-x.com/getting-started?hsLang=en#main-content) - [Guidelines](https://knowledge.bigenius-x.com/getting-started?hsLang=en#guidelines) - [Start working](https://knowledge.bigenius-x.com/getting-started?hsLang=en#start-working) - 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