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What is a point-in-time table?
What is a point in time (pit)?
What is point in time architecture?
What is point-in-time architecture?
A Point In Time (PIT) table is an optional concept in Data Vault that facilitates easier and more performant retrieval of data from the Data Vault model. It is a helper construct that is primarily meant to increase overall performance of queries.
A Point-In-Time table is a query assistant structure, part of the Business Vault, meant to improve the performance of loading and creating the information marts.
Dec 6, 2023 · Point-in-timetables cover the problem when there are multiple satellites on the hub or link and when you are querying the data out of it. The problem arises because the changes to the business...
- Merging Time-Variant Data
- Joining Historised Data Sets Together
- Making Joining Easier When You Have Multiple Tables in Scope
- Are We There Yet?
- Final Thoughts
Beyond creating Hubs, Links and Satellites and current-state (Type 1) views off a Data Vault model, one of the most common requirements is the ability to represent a complete history of changes for a specific business entity (Hub, Link or groups of those). A given Hub on average has 3 or 4 Satellites, and is it useful to see the full history of cha...
The basic approach to join two time-variant tables together is to join them on their shared key (CUSTOMER_SK in the example below) as well as their Effective and Expiry Date/Times. This is -by far- the easiest if you have an expiry date/time, of course, but if you don’t want to persist this you can always derive it off the effective date/time. In t...
The technique explained in the previous section is geared towards combining two time-variant sources and it is not very straightforward (transparent) to add moretime-variant tables using this approach. Of course you can wrap the above logic in a sub-query and merge this with the next time-variant set, but this creates complex logic – especially whe...
It is important to realise that the ranges / time-slices created provide the most detailed level available: that is allthe history available for all attributes between all involved tables. However, the attributes you select as output may not necessarily be directly related to some of the change records. Or, to look at this the other way: the attrib...
The above explanation should provide some handles to create your own time-variant output, but there are always other things to be aware of when deploying these solutions. This is especially true in cases where the result is instantiated into a physical table that needs to be periodically refreshed. Without going into too much detail (posts get too ...
Feb 16, 2022 · PIT (Point-In-Time) Tables are a specialist type of table that gathers data from historised satellites around a hub and presents an easy way for a query to get what the data looked like at a point in time. They are designed to improve the performance of your vault with regard to historical queries.
Feb 22, 2007 · In this article, Arthur Fuller presents a solution to this requirement in the form of a Point-in-Time architecture: a database design which allows a user to recreate an image of the database as it existed at any previous point in time, without destroying the current image.
Point-in-Time or PIT tables serve as query assistance tables in data vault modeling to facilitate easier querying of historical data. Satellite tables store changes in attributes over time along with the effective date of the change, thus ensuring that the entire history of changes is preserved.
