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With Transact-SQL, you can accomplish this by specifying a predicate function to select the rows that will be migrated from the history table rather than migrating all of the rows. Stretch a portion of the history table: Configure Stretch Database for only a portion of your history table to improve performance if your main scenario involves primarily querying recent historical data, but you wish to preserve the option to query older historical data when needed while storing this data remotely at a lower cost. When stretching the entire history table, you can either use the Stretch Wizard or Transact-SQL. In this case, the cost-effectiveness provided by Azure may be compelling. In other words, use this approach if performance of temporal querying is not critical. Stretch the entire history table: Configure Stretch Database for your entire history table if your main scenario is data audit in the environment with frequent data changes and relatively rare querying on historical data. Stretch-enabling a history table does not change how you interact with the temporal table in terms of data modification and temporal querying. Using the Stretch Database approach, you can stretch some or all of your temporal history tables to Azure and SQL Server will silently move historical data to Azure. Additionally, you can use Row-Level Security and other advanced SQL Server security features with Temporal and Stretch Database to protect your data. For additional security, you can encrypt data in motion using SQL Server's Always Encrypted feature. Stretch Database in SQL Server migrates your historical data transparently to Azure.
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Using the Stretch Database approach only applies to SQL Server and does not apply to SQL Database. For example, the condition SysEndTime < DATEADD (DAYS, -30, SYSUTCDATETIME ()) specifies that historical data older than one month needs to be removed or moved out from the history table. The end of period value for each row determines the moment when the row version becomes "closed", i.e. With each of these approaches, the logic for migrating or cleaning history data is based on the column that corresponds to end of period in the current table. The following four approaches for managing historical data in the temporal history table are available:
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Once you determine your data retention period, your next step is to develop a plan for managing historical data how and where you store your historical data and how to delete historical data that is older than your retention requirements. For example, applications in data audit and time travel scenarios have firm requirements in terms of for how long historical data must be available for online querying. Your retention policy, in most cases, should be considered to be part of the business logic of the application using the temporal tables. Managing temporal table data retention begins with determining the required retention period for each temporal table. Data retention management for history table Hence, developing a data retention policy for managing data in the history table is an important aspect of planning and managing the lifecycle of every temporal table.
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You have an update or delete heavy data modification patternĪ large and ever-growing history table can become an issue both due to pure storage costs as well as imposing a performance tax on temporal querying.You retain historical data for a long period of time.With system-versioned temporal tables, the history table may increase database size more than regular tables, particularly under the following conditions: The Decrease/Increase buttons have been deleted.Applies to: SQL Server 2016 (13.x) and later Azure SQL Database Azure SQL Managed Instance This allows a single pixel of padding on either side. The ScrollBar width is set to 10px, with an 8px wide thumb. In order for the thumb to render correctly in either orientation, two styles are needed. Next, the ScrollBarPageButton style is modified to have a transparent background: The resulting ScrollView looks like this:įirstly, the ScrollViewerControlTemplate must be overridden to allow the background image to bleed under the scroll bars: The original XAML was built using Expression Blend, and has been further simplified for clarity. The following post contains a basic example of how to customise the WPF ScrollView scroll bars.