Based on the PaaS prototype, which Azure SQL Database compute tier should you use?

You have an Azure SQL database named DBI that contains a nonclustered index named index1.
End users report slow queries when they use index1.
You need to identify the operations that are being performed on the index.
Which dynamic management view should you use?

You have an Azure SQL managed instance.
You need to gather the last execution of a query plan and its runtime statistics. The solution must minimize the impact on currently running queries.
What should you do?

You have an Azure SQL database named DB1.
You need to display the estimated execution plan of a query by using the query editor in the Azure portal.
What should you do first?

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You have SQL Server 2019 on an Azure virtual machine.
You are troubleshooting performance issues for a query in a SQL Server instance.
To gather more information, you query sys.dm_exec_requests and discover that the wait type is PAGELATCH_UP and the wait_resource is 2:3:905856.
You need to improve system performance.
Solution: You create additional tempdb files.
Does this meet the goal?