In Data Vault 2.0 Effectivity Satellites are artifacts that are exclusively used to Track the temporal relevance of a relationship based on a Driving Key. As such, they hang from a Link Table.

So what is an Effectivity Satellite?

For an Effectivity Satellite, a Driving Key needs to be defined. For e.g. let’s say we have a Link for Opportunities and relations to Accounts. The Account on Opportunity can change overtime. A common scenario is that the Opportunity is Assigned to a Global Parent account (e.g. Seagate Technology), and may get re-assigned to the Account Subsidiary (e.g. Lyve Labs) and get re-assigned to the Global Parent (Seagate Technology) at a later date

This will be tracked in the LINK as following:

LINK_HK OPPORTUNITY_HK OPPORTUNITY ACCOUNT_HK ACCOUNT LOAD_DATE
8913b4fa c89470 111 e184de02 Lyve Labs 2023-02-21 14:43:05
8cee5f97 c89470 111 92b3503 Seagate Technology 2023-02-21 14:53:57

Now the 3rd step, i.e. 111 switching back to Seagate Technology will not be captured in this LINK as a new row in this LINK

An Effectivity SAT can be used to Track effectivity (temporal relevance) of the aforementioned Opportunity to Account relationships.

SATE_OPPORTUNITY_ACCOUNT

LINK_HK OPPORTUNITY_HK OPPORTUNITY ACCOUNT_HK ACCOUNT START_DATE END_DATE LOAD_DATE
8913b4fa c89470 111 e184de02 Lyve Labs 2023-02-21 14:43:05 9999-12-31 0:00:00 2023-02-21 14:43:05
8cee5f97 c89470 111 92b3503 Seagate Technology 2023-02-21 14:53:57 9999-12-31 0:00:00 2023-02-21 14:53:57
8913b4fa c89470 111 e184de02 Lyve Labs 2023-02-21 14:43:05 2023-02-21 14:53:57 2023-02-21 14:53:57
8cee5f97 c89470 111 92b3503 Seagate Technology 2023-02-21 14:53:57 2023-02-21 15:00:31 2023-02-21 15:00:31
8913b4fa c89470 111 e184de02 Lyve Labs 2023-02-21 15:38:30 9999-12-31 0:00:00 2023-02-21 15:38:30
8cee5f97 c89470 111 92b3503 Seagate Technology 2023-02-21 15:44:42 9999-12-31 0:00:00 2023-02-21 15:44:42
8913b4fa c89470 111 e184de02 Lyve Labs 2023-02-21 15:38:30 2023-02-21 15:44:42 2023-02-21 15:44:42
  1. When the relationship is first recorded only 1 record is inserted (row 1 in the above table)
  2. When there is a change in a relationship it must be based on the driving key (OPPORTUNITY), we track its change vs the Secondary Foreign Key in the Relationship (ACCOUNT). To do that we end_date one record and insert a new “active record”; i.e. 2 records inserted. (row 2 and 3 in the above table)

See also: