--- title: Link Satellite description: A Link Satellite stores the descriptive data of a Link's rows and its history in a table of the Raw Vault layer. --- [Skip to content](https://knowledge.bigenius-x.com/create-a-link-satellite#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. [Model Object Type](https://knowledge.bigenius-x.com/generators?hsLang=en#model-object-type) # Link Satellite **Applies to** Platform: Microsoft SQL Server · Snowflake · Snowflake dbt · Databricks · Databricks dbt · Fabric Lakehouse · Fabric Warehouse · Oracle Architecture: Data Vault A Link Satellite stores the descriptive data of a Link's rows and its history in a table of the Raw Vault layer. Use it for attributes that belong to a relationship, such as the data of a loyalty card's holder, or to track which relationship of a Driving Key Link is current. After each load, the result view shows every version of each Link row with its validity. ### Sources and relationships A Link Satellite reads [Stages](https://knowledge.bigenius-x.com/create-a-stage?hsLang=en), [RawVault Composites](https://knowledge.bigenius-x.com/create-a-raw-vault-composite?hsLang=en) and [Store Entities](https://knowledge.bigenius-x.com/create-a-store-entity?hsLang=en) of a linked Data Store project, in one or more dataflows. It has exactly one relationship to a [Link](https://knowledge.bigenius-x.com/create-a-link?hsLang=en), [Driving Key Link](https://knowledge.bigenius-x.com/create-a-driving-key-link?hsLang=en) or [Hierarchical Link](https://knowledge.bigenius-x.com/create-a-hierachical-link?hsLang=en), and its foreign-key terms must be mapped. The foreign-key terms are the business keys of the Link's Hubs. PIT, Current View, History View, BusinessVault Composite, [Vault Out](https://knowledge.bigenius-x.com/create-a-vault-out?hsLang=en) and the Business Vault types can read a Link Satellite. ### Create a Link Satellite - With the wizard: open the menu of a Stage, RawVault Composite or Store Entity, choose **Automate** and then **Create Link Satellite**. Its steps are [Create Model Object](https://knowledge.bigenius-x.com/wizard-step-create-model-object?hsLang=en), [Create Dataflow](https://knowledge.bigenius-x.com/wizard-step-create-dataflow?hsLang=en), [Create Relations](https://knowledge.bigenius-x.com/wizard-step-create-relations?hsLang=en), [Map Foreign Key Terms](https://knowledge.bigenius-x.com/wizard-step-map-foreign-key-terms?hsLang=en), [Map Selected Terms](https://knowledge.bigenius-x.com/wizard-step-map-selected-terms?hsLang=en) and [Add to View](https://knowledge.bigenius-x.com/wizard-step-add-to-view?hsLang=en). See [Create a Model Object with the wizard](https://knowledge.bigenius-x.com/create-a-model-object-with-the-wizard?hsLang=en). - Manually: [create a model object](https://knowledge.bigenius-x.com/create-a-model-object?hsLang=en) of type Link Satellite in the Raw Vault layer, [add a relationship](https://knowledge.bigenius-x.com/add-a-relationship?hsLang=en) to the Link, [create a dataflow set](https://knowledge.bigenius-x.com/create-a-data-flow-set?hsLang=en), [add the source model object](https://knowledge.bigenius-x.com/add-a-model-object-into-a-data-flow-set?hsLang=en) and [map the foreign-key terms and the descriptive terms](https://knowledge.bigenius-x.com/map-a-source-term-with-a-target-term?hsLang=en). ### Historization The loader inserts a new version of a Link row when its row hash `BG_RowHash` differs from the current version. The new version starts at the load timestamp, the previous version ends there, and the current version ends at [End of Universe](https://knowledge.bigenius-x.com/end-of-universe-project?hsLang=en). An unchanged row adds no version, and the loader never deletes or updates rows. - The row hash covers the descriptive terms. Business keys, foreign keys, Default Terms and the terms listed in [Excluded from Delta Detection](https://knowledge.bigenius-x.com/excluded-from-delta-detection-model-object?hsLang=en) are not part of it. See [BG\_RowHash](https://knowledge.bigenius-x.com/bg_rowhash?hsLang=en). - On a Driving Key Link, the Link Satellite also carries `DrivingKeyLink_HK`. Its row hash includes the business keys of the relationships that are not driving, and its versions end per `DrivingKeyLink_HK`. A new relationship of the same driving key therefore ends the version of the previous relationship. See [Driving Key Link](https://knowledge.bigenius-x.com/create-a-driving-key-link?hsLang=en). - With [Persist Validity](https://knowledge.bigenius-x.com/persist-validity-project?hsLang=en) `false`, the result view calculates `BG_ValidToTimestamp`; with `true`, the table stores it. ### Properties - [Implementation Type](https://knowledge.bigenius-x.com/implementation-type-model-object?hsLang=en): `Permanent` only. - [Foreign Key Mode](https://knowledge.bigenius-x.com/foreign-key-mode-model-object?hsLang=en): whether the table gets a foreign key to the Link table. With `Create Disabled`, the default, it is created and disabled. - [Load Caching](https://knowledge.bigenius-x.com/load-caching-model-object?hsLang=en): empty (default) or `Hashing`, which stores the hashing view in a table before the loader runs. - Increment Management Type: `Auto` (default) or `User`, for an incremental load with [`BG_IncrementalFilter`](https://knowledge.bigenius-x.com/bg_incrementalfilter?hsLang=en). See [Configure an incremental load](https://knowledge.bigenius-x.com/configure-an-incremental-load?hsLang=en). - [Custom Singleton Values](https://knowledge.bigenius-x.com/custom-singleton-values-model-object?hsLang=en): values of the unknown-member row. - [Excluded from Delta Detection](https://knowledge.bigenius-x.com/excluded-from-delta-detection-model-object?hsLang=en): terms that are stored but do not start a new version. - [Version Valid From Term](https://knowledge.bigenius-x.com/validfrom-source-term-dataflow-model-object?hsLang=en), per dataflow model object: loads the versions the source delivers. See [Configure a multi-version load](https://knowledge.bigenius-x.com/configure-a-multi-version-load?hsLang=en). - [Deduplication Method](https://knowledge.bigenius-x.com/deduplication-method-model-object?hsLang=en) and [Sort Order within Partition](https://knowledge.bigenius-x.com/deduplication-partition-model-object?hsLang=en), per dataflow. - Use Embryo Loader, on the relationship: inserts Link keys that the Link does not hold yet. When the Link's own relationships also use the Embryo Loader, it inserts the missing Hub keys too. See [Embryo Loader](https://knowledge.bigenius-x.com/embryo-loader?hsLang=en). The project properties Persist Validity and [Create Result Views](https://knowledge.bigenius-x.com/create-result-views-project?hsLang=en) also apply. ### Default Terms - [`Link_HK`](https://knowledge.bigenius-x.com/link_hk?hsLang=en): the key of the Link row, calculated from the foreign-key terms. - [`DrivingKeyLink_HK`](https://knowledge.bigenius-x.com/drivingkeylink_hk?hsLang=en): only on a Driving Key Link, the key of the driving relationships. - [`BG_ValidFromTimestamp`](https://knowledge.bigenius-x.com/bg_validfromtimestamp?hsLang=en): start of the version. With `Link_HK` it forms the primary key. - [`BG_ValidToTimestamp`](https://knowledge.bigenius-x.com/bg_validtotimestamp?hsLang=en): end of the version. - [`BG_RowHash`](https://knowledge.bigenius-x.com/bg_rowhash?hsLang=en): hash of the descriptive terms, compared with the current version. - [`BG_IncrementalFilter`](https://knowledge.bigenius-x.com/bg_incrementalfilter?hsLang=en): source term for an incremental load; not stored in the table. - [`BG_LoadTimestamp`](https://knowledge.bigenius-x.com/bg_loadtimestamp?hsLang=en) and [`BG_SourceSystem`](https://knowledge.bigenius-x.com/bg_sourcesystem?hsLang=en): the load that inserted the row and its source system, empty unless you map it. - [`BG_DataQuality_ID`](https://knowledge.bigenius-x.com/bg-dataquality-id?hsLang=en), [`BG_ErrorCount`](https://knowledge.bigenius-x.com/bg_errorcount?hsLang=en) and [`BG_ErrorDescription`](https://knowledge.bigenius-x.com/bg_errordescription?hsLang=en): hidden terms of the data quality objects. ### Generated objects These are the names on Microsoft SQL Server for the Link Satellite `load_lsat` with one dataflow: | Role | Generated name | Purpose | | --- | --- | --- | | Source | `RDV_LSAT_load_lsat_Source` | Reads the sources | | Deduplication | `RDV_LSAT_load_lsat_Deduplication` | Removes duplicate rows | | MultiVersion | `RDV_LSAT_load_lsat_Versioning` | Combines the source versions | | Hashing | `RDV_LSAT_load_lsat_Hashing` | Calculates the hash keys | | HashingStorage | `RDV_LSAT_load_lsat_HashingTable` | Stores the hashed rows | | HashingLoader | `RDV_LSAT_load_lsat_HashingLoader` | Fills the hashing table | | RowCondensing | `RDV_LSAT_load_lsat_RowCondensing` | Merges equal versions | | IncrementSource | `RDV_LSAT_load_lsat_IncrementSource` | Finds the new increment | | Increment | `RDV_LSAT_load_lsat_Increment` | Stores the increments | | EmbryoLoader | `RDV_LSAT_load_lsat_EmbryoLoader` | Adds missing Link and Hub keys | | Delta | `RDV_LSAT_load_lsat_Delta` | Selects new versions | | Loader | `RDV_LSAT_load_lsat_Loader` | Inserts the new versions | | Storage | `RDV_LSAT_load_lsat` | Link Satellite table | | Result | `RDV_LSAT_load_lsat_Result` | Query view with validity | - Loaders are stored procedures; the Link Satellite table, the hashing table and the increment table are tables; all other objects are views. - The deduplication view exists only with a Deduplication Method other than `None`. - The versioning and row-condensing views exist only with a Version Valid From Term. - The hashing table and hashing loader exist only with Load Caching `Hashing`. - The increment table exists only with an incremental load, that is, when a dataflow maps `BG_IncrementalFilter`; the increment source view only with Increment Management Type `Auto`. - The embryo loader exists only when Use Embryo Loader is true on the relationship. It runs before the loader. - The result view exists only with Create Result Views; without it, Persist Validity must be true. - With several dataflows, all objects except the table and the result view exist once per dataflow, with the dataflow name in their names. - The table script inserts the unknown-member row with a `Link_HK` of zeros. The result view hides it. With the default settings, a load runs this chain: ``` sources -> _Source -> _Hashing -> _Delta -> _Loader _Loader -> RDV_LSAT_load_lsat -> _Result _Result -> _Delta (current versions) ``` The delta view keeps the source rows whose `Link_HK` and `BG_RowHash` do not match a current version in the result view. The loader inserts them with the load timestamp as `BG_ValidFromTimestamp`. The optional objects sit in the same places as in a [Satellite](https://knowledge.bigenius-x.com/create-a-satellite?hsLang=en): `_Deduplication` and `_Versioning` before `_Hashing`, `_HashingTable` or `_RowCondensing` after it, and `_Increment` filters `_Source`. ### Example The Link Satellite `load_lsat` on Microsoft SQL Server reads the Stage `LOYALTYCARD` joined with the Stage `CUSTOMER`. It has a relationship to the Link `common_loyaltycard_customer` between customers and loyalty cards, and it stores the customer's data, for example `CUSTOMER`. Persist Validity is false. The loads deliver these rows: - Load 1 on 2026-10-28 08:00: card 501 of Contoso Ltd (customer 1) and card 502 of Fabrikam AG (customer 2). - Load 2 on 2026-10-29 08:00: customer 1 is renamed to Contoso Group, and card 503 of the new customer 3 Northwind arrives. - Load 3 on 2026-10-30 08:00: the same rows as load 2. ### Check the result Query the result view with the keys of the Link, here in the schema `rv`: ``` SELECT l.FK_load_customer_hub_CUSTOMER_CUSTOMER_ID AS CUSTOMER_ID, l.FK_common_loyaltycard_LOYALTYCARD_LOYALTYCARD_ID AS LOYALTYCARD_ID, s.CUSTOMER, s.BG_ValidFromTimestamp, s.BG_ValidToTimestamp FROM rv.RDV_LSAT_load_lsat_Result AS s JOIN rv.RDV_LNK_common_loyaltycard_customer_Result AS l ON l.Link_HK = s.Link_HK ORDER BY CUSTOMER_ID, s.BG_ValidFromTimestamp; ``` This is the result after load 3, with the column names shortened: ``` CUSTOMER_ID CARD CUSTOMER ValidFrom ValidTo 1 501 Contoso Ltd 2026-10-28 08:00 2026-10-29 08:00 1 501 Contoso Group 2026-10-29 08:00 9999-12-31 00:00 2 502 Fabrikam AG 2026-10-28 08:00 9999-12-31 00:00 3 503 Northwind 2026-10-29 08:00 9999-12-31 00:00 ``` - The new name of customer 1 started a second version of the Link row of card 501 and ended the first one. - Load 3 inserted no row. For a Link Satellite on a Driving Key Link, see the example in [Driving Key Link](https://knowledge.bigenius-x.com/create-a-driving-key-link?hsLang=en). ### Platform differences - Persist Validity is true by default on Snowflake, Snowflake dbt, Databricks, Databricks dbt, Fabric Lakehouse and Fabric Warehouse, and false on Microsoft SQL Server and Oracle. - Snowflake: names are in capitals, and the loader is a stored procedure. A load control task calls it. The dataflow properties [Use Stream](https://knowledge.bigenius-x.com/use-stream-model-object?hsLang=en) and Warehouse Placeholder Variable Name apply. - Databricks and Fabric Lakehouse: table and view names are in lowercase, and the loader is the notebook `RDV_LSAT__Loader`. The properties [File Format](https://knowledge.bigenius-x.com/file-format-model-object?hsLang=en), [Optimization Method](https://knowledge.bigenius-x.com/optimization-method-model-object?hsLang=en), [Optimization Method Columns](https://knowledge.bigenius-x.com/optimization-method-columns-model-object?hsLang=en) and [Use Sequential Dataflow Execution](https://knowledge.bigenius-x.com/use-sequential-dataflow-execution-model-object?hsLang=en) apply. Fabric Lakehouse allows only Foreign Key Mode `None`. - Databricks dbt and Snowflake dbt: the Link Satellite becomes the dbt models `rdv_lsat__source` and `rdv_lsat_`. The model `rdv_lsat__result` exists only when Create Result Views is true; the default on dbt is false. Load Caching, Increment Management Type and Use Embryo Loader are not available. - Fabric Warehouse: the same objects as on Microsoft SQL Server, deployed by notebooks. - Oracle: names are in capitals, and the loader is a PL/SQL package. [Hash Group Size](https://knowledge.bigenius-x.com/hash-group-size-model-object?hsLang=en) splits the input of `BG_RowHash` into groups of terms; with the value 2, every two terms are hashed together and the results are hashed again. Partition Clause adds its text to the `CREATE TABLE` statement. Table Compression, the tablespaces and the statistics properties also apply. - Foreign Key Mode `Create Enforced` exists only on Microsoft SQL Server and Oracle. ### Limitations - A Link Satellite has exactly one relationship to a Link, Driving Key Link or Hierarchical Link. Business keys on a Link Satellite raise a validation warning. - With a Version Valid From Term, a Link Satellite allows one dataflow, one dataflow set and no aggregation. - A dataflow delivers at most one row per Link row and load. Two rows with different values for a new Link row make the loader fail with a primary key violation. ### Release differences - Generator 2.2: Increment Management Type, Use Embryo Loader and Persist Validity are available. - Generator 2.3: Custom Singleton Values is available, and Hash Group Size on Oracle. - Generator 2.4: Excluded from Delta Detection is available. On a Driving Key Link, versions end per `DrivingKeyLink_HK`. ### Related articles - Previous: [Link](https://knowledge.bigenius-x.com/create-a-link?hsLang=en), [Driving Key Link](https://knowledge.bigenius-x.com/create-a-driving-key-link?hsLang=en), [Hierarchical Link](https://knowledge.bigenius-x.com/create-a-hierachical-link?hsLang=en) - Next: [Configure a multi-version load](https://knowledge.bigenius-x.com/configure-a-multi-version-load?hsLang=en), [Configure an incremental load](https://knowledge.bigenius-x.com/configure-an-incremental-load?hsLang=en) - Reference: [Link\_HK](https://knowledge.bigenius-x.com/link_hk?hsLang=en), [DrivingKeyLink\_HK](https://knowledge.bigenius-x.com/drivingkeylink_hk?hsLang=en), [BG\_RowHash](https://knowledge.bigenius-x.com/bg_rowhash?hsLang=en), [Excluded from Delta Detection (Model Object)](https://knowledge.bigenius-x.com/excluded-from-delta-detection-model-object?hsLang=en), [Version Valid From Term (Dataflow Model Object)](https://knowledge.bigenius-x.com/validfrom-source-term-dataflow-model-object?hsLang=en), [Persist Validity (Project)](https://knowledge.bigenius-x.com/persist-validity-project?hsLang=en), [Create Result Views (Project)](https://knowledge.bigenius-x.com/create-result-views-project?hsLang=en), [Custom Singleton Values (Model Object)](https://knowledge.bigenius-x.com/custom-singleton-values-model-object?hsLang=en), [Hash Group Size (Model Object)](https://knowledge.bigenius-x.com/hash-group-size-model-object?hsLang=en), [Foreign Key Mode (Model Object)](https://knowledge.bigenius-x.com/foreign-key-mode-model-object?hsLang=en) - See also: [Satellite](https://knowledge.bigenius-x.com/create-a-satellite?hsLang=en), [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), [Embryo Loader](https://knowledge.bigenius-x.com/embryo-loader?hsLang=en), [Create a Model Object with the wizard](https://knowledge.bigenius-x.com/create-a-model-object-with-the-wizard?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) - [Account](https://knowledge.bigenius-x.com/getting-started?hsLang=en#account) - [General overview](https://knowledge.bigenius-x.com/general-overview?hsLang=en) - [Artificial Intelligence](https://knowledge.bigenius-x.com/artificial-intelligence?hsLang=en) - 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