You have files and folders in Azure Data Lake Storage Gen2 for an Azure Synapse workspace as shown in the following exhibit.You create an external table named ExtTable that has LOCATION='/topfolder/'.When you query ExtTable by using an Azure Synapse Analytics serverless SQL pool, which files are returned?
Answer(s): B
HOTSPOT (Drag and Drop is not supported)You are planning the deployment of Azure Data Lake Storage Gen2. You have the following two reports that will access the data lake:-Report1: Reads three columns from a file that contains 50 columns. -Report2: Queries a single record based on a timestamp.You need to recommend in which format to store the data in the data lake to support the reports. The solution must minimize read times. What should you recommend for each report? To answer, select the appropriate options in the answer area.NOTE: Each correct selection is worth one point.Hot Area:
Answer(s): A
Report1: CSVCSV: The destination writes records as delimited data.Report2: AVROAVRO supports timestamps.Not Parquet, TSV: Not options for Azure Data Lake Storage Gen2.
https://streamsets.com/documentation/datacollector/latest/help/datacollector/UserGuide/Destinations/ADLS-G2-D.html
You are designing the folder structure for an Azure Data Lake Storage Gen2 container.Users will query data by using a variety of services including Azure Databricks and Azure Synapse Analytics serverless SQL pools. The data will be secured by subject area. Most queries will include data from the current year or current month.Which folder structure should you recommend to support fast queries and simplified folder security?
Answer(s): D
There's an important reason to put the date at the end of the directory structure. If you want to lock down certain regions or subject matters to users/ groups, then you can easily do so with the POSIX permissions. Otherwise, if there was a need to restrict a certain security group to viewing just the UK data or certain planes, with the date structure in front a separate permission would be required for numerous directories under every hour directory.Additionally, having the date structure in front would exponentially increase the number of directories as time went on.Note: In IoT workloads, there can be a great deal of data being landed in the data store that spans across numerous products, devices, organizations, and customers. It’s important to pre-plan the directory layout for organization, security, and efficient processing of the data for down-stream consumers. A general template to consider might be the following layout:{Region}/{SubjectMatter(s)}/{yyyy}/{mm}/{dd}/{hh}/
HOTSPOT (Drag and Drop is not supported)You need to output files from Azure Data Factory.Which file format should you use for each type of output? To answer, select the appropriate options in the answer area.NOTE: Each correct selection is worth one point.Hot Area:
Box 1: ParquetParquet stores data in columns, while Avro stores data in a row-based format. By their very nature, column-oriented data stores are optimized for read- heavy analytical workloads, while row-based databases are best for write-heavy transactional workloads.Box 2: AvroAn Avro schema is created using JSON format. AVRO supports timestamps.Note: Azure Data Factory supports the following file formats (not GZip or TXT). Avro formatBinary formatDelimited text format Excel formatJSON format ORC format Parquet format XML format
https://www.datanami.com/2018/05/16/big-data-file-formats-demystified
HOTSPOT (Drag and Drop is not supported)You use Azure Data Factory to prepare data to be queried by Azure Synapse Analytics serverless SQL pools.Files are initially ingested into an Azure Data Lake Storage Gen2 account as 10 small JSON files. Each file contains the same data attributes and data from a subsidiary of your company.You need to move the files to a different folder and transform the data to meet the following requirements: -Provide the fastest possible query times.-Automatically infer the schema from the underlying files.How should you configure the Data Factory copy activity? To answer, select the appropriate options in the answer area.NOTE: Each correct selection is worth one point.Hot Area:
Box 1: Preserver herarchyCompared to the flat namespace on Blob storage, the hierarchical namespace greatly improves the performance of directory management operations, which improves overall job performance.Box 2: ParquetAzure Data Factory parquet format is supported for Azure Data Lake Storage Gen2. Parquet supports the schema property.
https://docs.microsoft.com/en-us/azure/storage/blobs/data-lake-storage-introductionhttps://docs.microsoft.com/en-us/azure/data-factory/format-parquet
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