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Introducing Microsoft SQL Server 2019

You're reading from   Introducing Microsoft SQL Server 2019 Reliability, scalability, and security both on premises and in the cloud

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Product type Paperback
Published in Apr 2020
Publisher Packt
ISBN-13 9781838826215
Length 488 pages
Edition 1st Edition
Languages
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Authors (8):
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Allan Hirt Allan Hirt
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Allan Hirt
Dustin Ryan Dustin Ryan
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Dustin Ryan
Mitchell Pearson Mitchell Pearson
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Mitchell Pearson
Kellyn Gorman Kellyn Gorman
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Kellyn Gorman
Dave Noderer Dave Noderer
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Dave Noderer
Buck Woody Buck Woody
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Buck Woody
Arun Sirpal Arun Sirpal
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Arun Sirpal
James Rowland-Jones James Rowland-Jones
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James Rowland-Jones
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Table of Contents (15) Chapters Close

Preface 1. Optimizing for performance, scalability and real‑time insights 2. Enterprise Security FREE CHAPTER 3. High Availability and Disaster Recovery 4. Hybrid Features – SQL Server and Microsoft Azure 5. SQL Server 2019 on Linux 6. SQL Server 2019 in Containers and Kubernetes 7. Data Virtualization 8. Machine Learning Services Extensibility Framework 9. SQL Server 2019 Big Data Clusters 10. Enhancing the Developer Experience 11. Data Warehousing 12. Analysis Services 13. Power BI Report Server 14. Modernization to the Azure Cloud

Temporal tables

Temporal tables store data and all changes so that data from a previous point in time can be retrieved. SQL Server 2016 added support for temporal tables. Temporal tables are also known as system-versioned temporal tables.

Each temporal table is paired with a history table so that normal queries pull data from the table as normal, but historical queries can be constructed that pull data from the history table. The following diagram illustrates this:

Figure 10.8: Temporal table structure

Why temporal tables?

Some use cases of temporal tables are as follows:

  • Audit trail – Keep a full log of what changed in the table.
  • Accidental changes – Easily restore data that was mistakenly changed or deleted.
  • Historical reports – Be able to report on how data changes over time.
  • Detect changes – Compare current and previous data more easily.

Temporal table example

When creating temporal tables...

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