Administering Relational Databases on Microsoft Azure Exam (DP-300) - Microsoft

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Azure Database Migration service Box 1: Premium 4-VCore Scenario: Migrate the SERVER1 databases to the Azure SQL Database platform. Minimize downtime during the migration of the SERVER1 databases. Premimum 4-vCore is for large or business critical workloads. It supports online migrations, offline migrations, and faster migration speeds. The Standard pricing tier suits most small- to medium- business workloads, but it supports offline<br />
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Incorrect Answers: migration only. Box 2: A VPN gateway You need to create a Microsoft Azure Virtual Network for the Azure Database Migration Service by using the Azure Resource Manager deployment model, which provides site-to-site connectivity to your on-premises source servers by using either ExpressRoute or VPN.<br />
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Reference: https://azure.microsoft.com/pricing/details/database-migration/ https://docs.microsoft.com/en-us/azure/dms/tutorial-sql-server-azure-sql-online

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Scenario: Authenticate database users by using Active Directory credentials. The configuration steps include the following procedures to configure and use Azure Active Directory authentication. Create and populate Azure AD. Optional: Associate or change the active directory that is currently associated with your Azure Create an Azure Active Directory administrator. (Step 1) Subscription. Configure your client computers. Create contained database users in your database mapped to Azure AD identities. (Step 2) Connect to your database by using Azure AD identities. (Step 3)<br />
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Reference: https://docs.microsoft.com/en-us/azure/azure-sql/database/authentication-aad-overview

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Box 1: The server, the elastic pool, and the database<br />
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Senario: SalesSQLDb1 is in an elastic pool named SalesSQLDb1Pool. Litware technical requirements include: all SQL Server and Azure SQL Database metrics related to CPU and storage usage and limits must be analyzed by using Azure built-in functionality. Box 2: Azure Event hubs Scenario: Migrate ManufacturingSQLDb1 to the Azure virtual machine platform. Event hubs are able to handle custom metrics.<br />
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Incorrect Answers: Azure Log Analytics Azure metric and log data are sent to Azure Monitor Logs, previously known as Azure Log Analytics, directly by Azure. Azure SQL Analytics is a cloud only monitoring solution supporting streaming of diagnostics telemetry for all of your Azure SQL databases. However, because Azure SQL Analytics does not use agents to connect to Azure Monitor, it does not support monitoring of SQL Server hosted on-premises or in virtual machines.

SalesSQLDb1 experiences performance issues that are likely due to out-of-date statistics and frequent blocking queries. A: Use sys.dm_pdw_nodes_tran_locks instead of sys.dm_tran_locks from Azure Synapse Analytics (SQL Data Warehouse) or Parallel Data Warehouse.<br />
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E: Example: The following query will show blocking information. SELECT t1.resource_type, t1.resource_database_id, t1.resource_associated_entity_id, t1.request_mode, t1.request_session_id, t2.blocking_session_id<br />
FROM sys.dm_tran_locks as t1<br />
INNER JOIN sys.dm_os_waiting_tasks as t2<br />
ON t1.lock_owner_address = t2.resource_address;<br />
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Note: Depending on the system you’re working with you can access these wait statistics from one of three locations: sys.dm_os_wait_stats: for SQL Server sys.dm_db_wait_stats: for Azure SQL Database sys.dm_pdw_nodes_os_wait_stats: for Azure SQL Data Warehouse<br />
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Incorrect Answers: F: sys.dm_tran_locks returns information about currently active lock manager resources in SQL Server 2019 (15.x). Each row represents a currently active request to the lock manager for a lock that has been granted or is waiting to be granted. Instead use sys.dm_pdw_nodes_tran_locks.<br />
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Reference: https://docs.microsoft.com/en-us/sql/relational-databases/system-dynamic-management- views/sys-dm-tran-locks-transact-sql

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Scenario: Business Requirements<br />
Litware identifies business requirements include: meet an SLA of 99.99% availability for all Azure<br />
deployments. Box 1: Cloud witness<br />
If you have a Failover Cluster deployment, where all nodes can reach the internet (by extension of<br />
Azure), it is recommended that you configure a Cloud Witness as your quorum witness resource. Box 2: Azure Basic Load Balancer Microsoft guarantees that a Load Balanced Endpoint using Azure Standard Load Balancer, serving two<br />
or more Healthy Virtual Machine Instances, will be available 99.99% of the time.<br />
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Note: There are two main options for setting up your listener: external (public) or internal. The external (public) listener uses an internet facing load balancer and is associated with a public Virtual IP (VIP) that is accessible over the internet. An internal listener uses an internal load balancer and only supports clients within the same Virtual Network.<br />
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Reference: https://technet.microsoft.com/windows-server-docs/failover-clustering/deploy-cloud-witness https://azure.microsoft.com/en-us/support/legal/sla/load-balancer/v1_0/