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Query Performance Optimization

Reviewing query plans
- Determining the ideal execution plan
- Identification of problem sections in execution plans
- Extraction of query plans from the Query Store
Evaluation of Performance improvements
- Determining the ideal Dynamic Management Views (DMVs) to collect information relating query performance
- Using DMVs to identify performance issues
- Implementation and identification of index changes for queries
- Assessing the importance of hints in query performance
- Defining query construct modifications
Reviewing index design and database table
- Identifying issues on data quality and data duplication
- Database tables
- Assessing index design
- Validating data types
- Recommending table and index storage including file groups
- Evaluation of table partitioning strategy
- Compression for indexes and tables

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Microsoft Administering Relational Databases on Microsoft Azure Sample Questions (Q350-Q355):

NEW QUESTION # 350
You have an Azure subscription that contains an Azure SQL database. The database contains a table named tablet.
You execute the following Transact-SQL statements.

You need to reduce the time it takes to perform analytic queries on the database.
Which configuration should you enable?

A. ROW_ MODE_MEMORY GRANT_FEEDBACK
B. BATC H_MODE_ON_ROWSTOR E
C. BATCH_MODE_ADAPTIVE_TOIMS
D. BATCH MODE_MEMORY GRAIJT_FEEDBACK

Answer: B

NEW QUESTION # 351
You are creating a managed data warehouse solution on Microsoft Azure.
You must use PolyBase to retrieve data from Azure Blob storage that resides in parquet format and load the data into a large table called FactSalesOrderDetails.
You need to configure Azure Synapse Analytics to receive the data.
Which four 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.

Answer:

Explanation:

Explanation:

To query the data in your Hadoop data source, you must define an external table to use in Transact-SQL queries. The following steps describe how to configure the external table.
Step 1: Create a master key on database.
1. Create a master key on the database. The master key is required to encrypt the credential secret.
(Create a database scoped credential for Azure blob storage.)
Step 2: Create an external data source for Azure Blob storage.
2. Create an external data source with CREATE EXTERNAL DATA SOURCE..
Step 3: Create an external file format to map the parquet files.
3. Create an external file format with CREATE EXTERNAL FILE FORMAT.
Step 4. Create an external table FactSalesOrderDetails
4. Create an external table pointing to data stored in Azure storage with CREATE EXTERNAL TABLE.
Reference:
https://docs.microsoft.com/en-us/sql/relational-databases/polybase/polybase-configure-azure-blob-storage

NEW QUESTION # 352
You have an Azure Data Lake Storage Gen2 container.
Data is ingested into the container, and then transformed by a data integration application. The data is NOT modified after that. Users can read files in the container but cannot modify the files.
You need to design a data archiving solution that meets the following requirements:
New data is accessed frequently and must be available as quickly as possible.
Data that is older than five years is accessed infrequently but must be available within one second when requested.
Data that us older than seven years is NOT accessed. After seven years, the data must be persisted at the lowest cost possible.
Costs must be minimized while maintaining the required availability.
How should you manage the data? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.

Answer:

Explanation:

Reference:
https://docs.microsoft.com/en-us/azure/storage/blobs/storage-blob-storage-tiers

NEW QUESTION # 353
You have SQL Server on an Azure virtual machine that contains a database named DB1.
You have an application that queries DB1 to generate a sales report.
You need to see the parameter values from the last time the query was executed.
Which two actions should you perform? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.

A. Enable Last_Query_Plan_Stats in DB1
B. Enable Last_Query_Plan_Stats in the master database
C. Enable Lightweight_Query_Profiling in DB1
D. Enable Lightweight_Query_Profiling in the master database
E. Enable PARAMETER_SNIFFING in DB1

Answer: C,E

Explanation:
Last_Query_Plan_Stats allows you to enable or disable collection of the last query plan statistics (equivalent to an actual execution plan) in sys.dm_exec_query_plan_stats.
Lightweight profiling can be disabled at the database level using the LIGHTWEIGHT_QUERY_PROFILING database scoped configuration: ALTER DATABASE SCOPED CONFIGURATION SET LIGHTWEIGHT_QUERY_PROFILING = OFF;.
Reference:
https://docs.microsoft.com/en-us/sql/relational-databases/performance/query-profiling-infrastructure

NEW QUESTION # 354
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.

Answer:

Explanation:

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-instan

NEW QUESTION # 355
......

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