Microsoft DP-300 시험

Question No : 1

You have an Azure SQL database.
Users report that the executions of a stored procedure are slower than usual. You suspect that a regressed query is causing the performance issue.
You need to view the query execution plan to verify whether a regressed query is causing the issue.
The solution must minimize effort.
What should you use?

• A.Performance Recommendations in the Azure portal
• B.Extended Events in Microsoft SQL Server Management Studio (SSMS)
• C.Query Store in Microsoft SQL Server Management Studio (SSMS)
• D.Query Performance Insight in the Azure portal

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정답:
Explanation:
Use the Query Store Page in SQL Server Management Studio.
Query performance regressions caused by execution plan changes can be non-trivial and time consuming to resolve.
Since the Query Store retains multiple execution plans per query, it can enforce policies to direct the Query Processor to use a specific execution plan for a query. This is referred to as plan forcing. Plan forcing in Query Store is provided by using a mechanism similar to the USE PLAN query hint, but it does not require any change in user applications. Plan forcing can resolve a query performance regression caused by a plan change in a very short period of time.
Reference: https://docs.microsoft.com/en-us/sql/relational-databases/performance/monitoring-performance-by-using-the-query-store

Question No : 2

You have an Azure SQL database named DB1. You run a query while connected to DB1.
You review the actual execution plan for the query, and you add an index to a table referenced by the query.
You need to compare the previous actual execution plan for the query to the Live Query Statistics.
What should you do first in Microsoft SQL Server Management Studio (SSMS)?

• A.For DB1, set QUERY_CAPTURE_MODE of Query Store to All.
• B.Run the SET SHOWPLAN_ALL Transact-SQL statement.
• C.Save the actual execution plan.
• D.Enable Query Store for DB1.

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정답:
Explanation:
The Plan Comparison menu option allows side-by-side comparison of two different execution plans, for easier identification of similarities and changes that explain the different behaviors for all the reasons stated above.
This option can compare between:
Two previously saved execution plan files (.sqlplan extension).
One active execution plan and one previously saved query execution plan.
Two selected query plans in Query Store.

Question No : 3

HOTSPOT
You have an Azure SQL database named DB1.
The automatic tuning options for DB1 are configured as shown in the following exhibit.



For each of the following statements, select Yes if the statement is true. Otherwise, select No. NOTE: Each correct selection is worth one point.

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정답:


Explanation:
Box 1: Yes
We see: Tuning option: Create index ON
CREATE INDEX - Identifies indexes that may improve performance of your workload, creates indexes, and automatically verifies that performance of queries has improved.
Box 2: No
Box 3: Yes
FORCE LAST GOOD PLAN (automatic plan correction) - Identifies Azure SQL queries using an
execution plan that is slower than the previous good plan, and queries using the last known good plan instead of the regressed plan.

Question No : 4

You have SQL Server on an Azure virtual machine that contains a database named DB1.
You view a plan summary that shows the duration in milliseconds of each execution of query 1178902 as shown in the following exhibit:



What should you do to ensure that the query uses the execution plan which executes in the least amount of time?

• A.Force the query execution plan for plan 1221065.
• B.Run the DBCC FREEPROCCACHE command.
• C.Force the query execution plan for plan 1220917.
• D.Disable parameter sniffing.

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정답:
Explanation:
Reference: https://docs.microsoft.com/en-us/sql/relational-databases/performance/query-store-usage-scenarios

Question No : 5

You have SQL Server 2019 on an Azure virtual machine that runs Windows Server 2019. The virtual machine has 4 vCPUs and 28 GB of memory.
You scale up the virtual machine to 8 vCPUSs and 64 GB of memory.
You need to provide the lowest latency for tempdb.
What is the total number of data files that tempdb should contain?

• A.2
• B.4
• C.8
• D.64

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정답:
Explanation:
The number of files depends on the number of (logical) processors on the machine. As a general rule, if the number of logical processors is less than or equal to eight, use the same number of data files as logical processors. If the number of logical processors is greater than eight, use eight data files and then if contention continues, increase the number of data files by multiples of 4 until the contention is reduced to acceptable levels or make changes to the workload/code.
Reference: https://docs.microsoft.com/en-us/sql/relational-databases/databases/tempdb-database

Question No : 6

You have several Azure SQL databases on the same Azure SQL Database server in a resource group named ResourceGroup1.
You must be alerted when CPU usage exceeds 80 percent for any database. The solution must apply to any additional databases that are created on the Azure SQL server.
Which resource type should you use to create the alert?

• A.Resource Groups
• B.SQL Servers
• C.SQL Databases
• D.SQL Virtual Machines

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정답:
Explanation:
There are resource types related to application code, compute infrastructure, networking, storage + databases.
You can deploy up to 800 instances of a resource type in each resource group.
Some resources can exist outside of a resource group. These resources are deployed to the subscription, management group, or tenant. Only specific resource types are supported at these scopes.
Reference: https://docs.microsoft.com/en-us/azure/azure-resource-manager/management/resource-providers-and-types

Question No : 7

You have 50 Azure SQL databases.
You need to notify the database owner when the database settings, such as the database size and pricing tier, are modified in Azure.
What should you do?

• A.Create a diagnostic setting for the activity log that has the Security log enabled.
• B.For the database, create a diagnostic setting that has the InstanceAndAppAdvanced metric enabled.
• C.Create an alert rule that uses a Metric signal type.
• D.Create an alert rule that uses an Activity Log signal type.

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정답:
Explanation:
Activity log events - An alert can trigger on every event, or, only when a certain number of events occur.
Reference: https://docs.microsoft.com/en-us/azure/azure-sql/database/alerts-insights-configure-portal

Question No : 8

You have an Azure virtual machine named VM1 on a virtual network named VNet1. Outbound traffic from VM1 to the internet is blocked.
You have an Azure SQL database named SqlDb1 on a logical server named SqlSrv1.
You need to implement connectivity between VM1 and SqlDb1 to meet the following requirements:
✑ Ensure that VM1 cannot connect to any Azure SQL Server other than SqlSrv1.
✑ Restrict network connectivity to SqlSrv1.
What should you create on VNet1?

• A.a VPN gateway
• B.a service endpoint
• C.a private link
• D.an ExpressRoute gateway

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정답:
Explanation:
Azure Private Link enables you to access Azure PaaS Services (for example, Azure Storage and SQL Database) and Azure hosted customer-owned/partner services over a private endpoint in your virtual network.
Traffic between your virtual network and the service travels the Microsoft backbone network.
Exposing your service to the public internet is no longer necessary.
Reference: https://docs.microsoft.com/en-us/azure/private-link/private-link-overview

Question No : 9

DRAG DROP
You have an Azure SQL Database instance named DatabaseA on a server named Server1.
You plan to add a new user named App1 to DatabaseA and grant App1 db_datacenter permissions.
App1 will use SQL Server Authentication.
You need to create App1. The solution must ensure that App1 can be given access to other databases by using the same credentials.
Which three actions should you perform in sequence? To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.

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정답:


Explanation:
Step 1: On the master database, run CREATE LOGIN [App1] WITH PASSWORD = 'p@aaW0rd!'
Logins are server wide login and password pairs, where the login has the same password across all databases. Here is some sample Transact-SQL that creates a login:
CREATE LOGIN readonlylogin WITH password='1231!#ASDF!a';
You must be connected to the master database on SQL Azure with the administrative login (which you get from the SQL Azure portal) to execute the CREATE LOGIN command.
Step 2: On DatabaseA, run CREATE USER [App1] FROM LOGIN [App1]
Users are created per database and are associated with logins. You must be connected to the database in where you want to create the user. In most cases, this is not the master database. Here is some sample Transact-SQL that creates a user:
CREATE USER readonlyuser FROM LOGIN readonlylogin;
Step 3: On DatabaseA run ALTER ROLE db_datareader ADD Member [App1]
Just creating the user does not give them permissions to the database. You have to grant them access. In the Transact-SQL example below the readonlyuser is given read only permissions to the database via the db_datareader role.
EXEC sp_addrolemember 'db_datareader', 'readonlyuser';
Reference: https://azure.microsoft.com/en-us/blog/adding-users-to-your-sql-azure-database/

Question No : 10

You have 40 Azure SQL databases, each for a different customer. All the databases reside on the same Azure SQL Database server.
You need to ensure that each customer can only connect to and access their respective database.
Which two actions should you perform? Each correct answer presents part of the solution. NOTE: Each correct selection is worth one point.

• A.Implement row-level security (RLS).
• B.Create users in each database.
• C.Configure the database firewall.
• D.Configure the server firewall.
• E.Create logins in the master database.
• F.Implement Always Encrypted.

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정답:
Explanation:
Manage database access by adding users to the database, or allowing user access with secure connection strings.
Database-level firewall rules only apply to individual databases.
Reference: https://docs.microsoft.com/en-us/azure/azure-sql/database/secure-database-tutorial

Question No : 11

HOTSPOT
You have an Azure SQL database named DB1 that contains two tables named Table1 and Table2. Both tables contain a column named a Column1. Column1 is used for joins by an application named App1.
You need to protect the contents of Column1 at rest, in transit, and in use.
How should you protect the contents of Column1? To answer, select the appropriate options in the answer area. NOTE: Each correct selection is worth one point.

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정답:


Explanation:
Box 1: Column encryption Key
Always Encrypted uses two types of keys: column encryption keys and column master keys. A column encryption key is used to encrypt data in an encrypted column. A column master key is a key-protecting key that encrypts one or more column encryption keys.
Incorrect Answers:
TDE encrypts the storage of an entire database by using a symmetric key called the Database Encryption Key (DEK).
Box 2: Deterministic
Always Encrypted is a feature designed to protect sensitive data, such as credit card numbers or national identification numbers (for example, U.S. social security numbers), stored in Azure SQL Database or SQL Server databases. Always Encrypted allows clients to encrypt sensitive data inside client applications and never reveal the encryption keys to the Database Engine (SQL Database or SQL Server).
Always Encrypted supports two types of encryption: randomized encryption and deterministic encryption.
Deterministic encryption always generates the same encrypted value for any given plain text value. Using deterministic encryption allows point lookups, equality joins, grouping and indexing on encrypted columns.
Reference: https://docs.microsoft.com/en-us/sql/relational-databases/security/encryption/always-encrypted-database-engine

Question No : 12

You have a Microsoft SQL Server 2019 database named DB1 that uses the following database-level and instance-level features.
✑ Clustered columnstore indexes
✑ Automatic tuning
✑ Change tracking
✑ PolyBase
You plan to migrate DB1 to an Azure SQL database.
What feature should be removed or replaced before DB1 can be migrated?

• A.Clustered columnstore indexes
• B.PolyBase
• C.Change tracking
• D.Automatic tuning

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정답:
Explanation:
This table lists the key features for PolyBase and the products in which they're available.



Reference: https://docs.microsoft.com/en-us/sql/relational-databases/polybase/polybase-versioned-feature-summary

Question No : 13

HOTSPOT
You have an Azure SQL Database managed instance named sqldbmi1 that contains a database name Sales.
You need to initiate a backup of Sales.
How should you complete the Transact-SQL statement? To answer, select the appropriate options in the answer area. NOTE: Each correct selection is worth one point.

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정답:


Explanation:
Box 1: TO URL = 'https://storage1.blob.core.windows.net/blob1/Sales.bak'
Native database backup in Azure SQL Managed Instance.
You can backup any database using standard BACKUP T-SQL command:
BACKUP DATABASE tpcc2501
TO URL = 'https://myacc.blob.core.windows.net/testcontainer/tpcc2501.bak'
WITH COPY_ONLY
Box 2: WITH COPY_ONLY
Reference: https://techcommunity.microsoft.com/t5/azure-sql-database/native-database-backup-in-azure-sql-managed-instance/ba-p/386154

Question No : 14

HOTSPOT
You have SQL Server on an Azure virtual machine that contains a database named DB1.
The database reports a CHECKSUM error.
You need to recover the database.
How should you complete the statements? To answer, select the appropriate options in the answer area. NOTE: Each correct selection is worth one point.

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정답:


Explanation:
Box 1: SINGLE_USER
The specified database must be in single-user mode to use one of the following repair options.
Box 2: REPAIR_ALLOW_DATA_LOSS
REPAIR_ALLOW_DATA_LOSS tries to repair all reported errors. These repairs can cause some data loss.
Note: The REPAIR_ALLOW_DATA_LOSS option is a supported feature but it may not always be the best option for bringing a database to a physically consistent state. If successful, the REPAIR_ALLOW_DATA_LOSS option may result in some data loss. In fact, it may result in more data lost than if a user were to restore the database from the last known good backup.
Incorrect Answers:
REPAIR_FAST
Maintains syntax for backward compatibility only. No repair actions are performed.
Box 3: MULTI_USER
MULTI_USER
All users that have the appropriate permissions to connect to the database are allowed.
Reference: https://docs.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-checkdb-transact-sql

Question No : 15

You have an Azure SQL database named DB3.
You need to provide a user named DevUser with the ability to view the properties of DB3 from Microsoft SQL Server Management Studio (SSMS) as shown in the exhibit. (Click the Exhibit tab.)



Which Transact-SQL command should you run?

• A.GRANT SHOWPLAN TO DevUser
• B.GRANT VIEW DEFINITION TO DevUser
• C.GRANT VIEW DATABASE STATE TO DevUser
• D.GRANT SELECT TO DevUser

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정답:
Explanation:
The exhibits displays Database [State] properties.
To query a dynamic management view or function requires SELECT permission on object and VIEW SERVER STATE or VIEW DATABASE STATE permission.
Reference: https://docs.microsoft.com/en-us/sql/relational-databases/databases/database-properties-options-page