Adaptive query processing in SQL Server 2017

The batch mode adaptive joins feature enables the choice of a hash join or nested loop join method to be deferred until after the first input has been scanned. The adaptive join operator defines a threshold that is used to decide when to switch to a nested loop plan. Your plan can therefore dynamically switch to a better join strategy during execution. Here’s how it works:

If the row count of the build join input is small enough that a nested loop join would be more optimal than a hash join, your plan switches to a nested loop algorithm.

If the build join input exceeds a specific row count threshold, no switch occurs and your plan continues with a hash join.

Source: Adaptive query processing in Microsoft SQL databases | Microsoft Docs


What is the SSRS web portal  

The web portal is a web application that you open by typing the web portal URL in the address bar of the browser window. When you start the web portal, the pages, links and options that you see will vary based on the permissions you have on the report server. To perform a task, you must be assigned to a role that includes the task. A user who is assigned to a role that has full permissions has access to the complete set of application menus and pages available for managing a report server. A user assigned to a role that has permissions to view and run reports sees only the menus and pages that support those activities. Each user can have different role assignments for different report servers, or even for the various reports and folders that are stored on a single report server.For more information about roles, see Granting Permissions on a Native Mode Report Server.

Source: Web portal (SSRS Native Mode) | Microsoft Docs

Model many-to-many relationships using SQL Server Graph Database

A graph database is a collection of nodes (or vertices) and edges (or relationships). A node represents an entity (for example, a person or an organization) and an edge represents a relationship between the two nodes that it connects (for example, likes or friends). Both nodes and edges may have properties associated with them.

Source: SQL Graph overview | Microsoft Docs

SQL Server Machine Learning Tutorials

This article provides a comprehensive list of the tutorials, demos, and sample applications that use machine learning features in SQL Server 2016 or SQL Server 2017. Start here to learn how to run R or Python from T-SQL, use remote and local compute contexts, and optimize your R and Python code for a SQL production environment:

Source: SQL Server Machine Learning Tutorials | Microsoft Docs

Using the FORCESEEK Table Hint

If a plan contains table or index scan operators, and the corresponding tables cause a high number of reads during the execution of the query, as observed in the STATISTICS IO output, forcing an index seek operation may yield better query performance. This is especially true when inaccurate cardinality or cost estimations cause the optimizer to favor scan operations at plan compilation time.

Source: Using the FORCESEEK Table Hint

Enable AlwaysOn Availability Groups on a Windows Server Core 

Using SQL Server Configuration Manager RemotelyThese steps are meant to be performed on a PC running the client edition of Windows, or Windows Server that has the Server Graphical Shell installed.Open Computer Management. To open Computer Management, click Start, type compmgmt.msc, and then click OK.In the console tree, right-click Computer Management, and then click Connect to another computer….In the Select Computer dialog box, type the name of the Server Core machine that you want to manage, or click Browse to find it, and then click OK.In the console tree, under Computer Management of the Server Core machine, click Services and Applications.Double click SQL Server Configuration Manager.In SQL Server Configuration Manager, click SQL Server Services, right-click SQL Server (), where is the name of a local server instance for which you want to enable Always On Availability Groups, and click Properties.Select the AlwaysOn High Availability tab.Verify that Windows failover cluster name field contains the name of the local failover cluster node. If this field is blank, this server instance currently does not support AlwaysOn Availability Groups. Either the local computer is not a cluster node, the WSFC cluster has been shut down, or this edition of SQL Server 2017 that does not support AlwaysOn Availability Groups.Select the Enable AlwaysOn Availability Groups check box, and click OK.SQL Server Configuration Manager saves your change. Then, you must manually restart the SQL Server service. This enables you to choose a restart time that is best for your business requirements. When the SQL Server service restarts, AlwaysOn will be enabled, and the IsHadrEnabled server property will be set to 1.

Source: Configure SQL Server on a Server Core Installation | Microsoft Docs