A time travel With temporal tables Leonel Abreu leonel.abreu@gmail.com https://www.linkedin.com/in/leabreu https://es.linkedin.com/in/leabreu

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Agenda What’s a Temporal Table? It’s useful for A Short “How to” Advantages and how to use it It’s useful for Auditing efects Disaster Recovery Trending Analytics A Short “How to” Scenario and demo

What is a temporal table? Also known as System Versioned Because keep changes Just two extra columns To define periods Finally a second table Which contains the history

How does it work? Source: https://msdn.microsoft.com/en-us/library/dn935015.aspx

How does it work? Source: https://msdn.microsoft.com/en-us/library/dn935015.aspx

Advantages Security Easy to maintain Can be used Is not possible to modify the historical data Easy to maintain Additional coding to insert/update/delete data is not required Can be used For new tables For existing tables

Why temporal tables? Auditing Time Travel Recovering All data changes and forensics if necessary Time Travel State of data as of any time in the past Recovering From accidental data changes, as undesired DELETE operations

Why temporal tables? Calculate Also BI Schema included Trends over time Also BI Can be used to do SCD Schema included If the table structure is changed, it is also recorded

Why temporal tables? Real data sources are dynamic 9/4/2018 7:12 PM Why temporal tables? Real data sources are dynamic Historical data may be critical to business success Traditional databases fail to provide required insights Workarounds are… Complex, expensive, limited, inflexible, inefficient SQL Server 2016 makes life easy No change in programming model New Insights © 2014 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

Why temporal tables? Azure SQL Database Facts: Solution: Microsoft Ignite 2015 9/4/2018 7:12 PM Why temporal tables? Facts: History is much bigger than actual data Retained between 3 and 10 years “Warm”: up to a few weeks/months “Cold”: rarely queried SELECT * FROM Department FOR SYSTEM_TIME AS OF '2010.01.01' Azure SQL Database Solution: history as a stretch table: PeriodEnd < “Now - 6 months” © 2015 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

How to implement it? Source: https://msdn.microsoft.com/en-us/library/dn935015.aspx

How to implement it?

Query Clauses AS OF FROM TO SysStartTime SysStartTime <= date_time SysEndTime > date_time FROM TO SysStartTime < end_date_time SysEndTime > start_date_time

Query Clauses BETWEEN AND CONTAINED IN ALL SysStartTime <= end_date_time SysEndTime > start_date_time CONTAINED IN SysStartTime >= end_date_time SysEndTime <= start_date_time ALL Returns the union between the current and history table

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Q & A

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