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- content: "Which if the following statements is true of a lake database?"
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choices:
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- content: "Data is stored in a relational database store and can't be directly accessed in the data lake files."
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isCorrect: false
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explanation: "Incorrect. File storage is decoupled from the relational database schema and query processing."
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- content: "Data is stored in files that can't be queried using SQL."
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isCorrect: false
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explanation: "Incorrect. You can use SQL to query data in a lake database."
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- content: "A relational schema is overlaid on the underlying files, and can be queried using a serverless SQL pool or a Spark pool."
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isCorrect: true
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explanation: "Correct. A lake database abstracts files with a relational schema that can be queried using SQL in a serverless SQL pool or a Spark pool."
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- content: "You need to create a new lake database for a retail solution. What's the most efficient way to do this?"
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choices:
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- content: "Create a sample database in Azure SQL Database and export the SQL scripts to create the schema for the lake database."
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isCorrect: false
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explanation: "Incorrect. A sample Azure SQL database may not meet your needs, and the scripts wouldn't be suitable for a lake database."
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- content: "Start with the Retail database template in Azure Synapse Studio, and adapt it as necessary."
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isCorrect: true
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explanation: "Correct. The Gallery in Azure Synapse Studio includes industry-proven database schema templates, including one for retail."
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- content: "Start with an empty database and create a normalized schema."
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isCorrect: false
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explanation: "Incorrect. While this approach would work, it's more efficient to start from a template."
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- content: "You have Parquet files in an existing data lake folder for which you want to create a table in a lake database. What should you do?"
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choices:
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- content: "Use a CREATE EXTERNAL TABLE AS SELECT (CETAS) query to create the table."
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isCorrect: false
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explanation: "Incorrect. A CETAS statement will move the data and create a table based on the new location."
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- content: "Convert the files in the folder to CSV format."
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isCorrect: false
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explanation: "Incorrect. You can create lake database tables from Parquet files."
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- content: "Use the database designer to create a table based on the existing folder."
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isCorrect: true
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explanation: "Correct. You can add a table to a database from existing files."
- content: "Which if the following statements is true of a lake database?"
17
+
choices:
18
+
- content: "Data is stored in a relational database store and can't be directly accessed in the data lake files."
19
+
isCorrect: false
20
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explanation: "Incorrect. File storage is decoupled from the relational database schema and query processing."
21
+
- content: "Data is stored in files that can't be queried using SQL."
22
+
isCorrect: false
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explanation: "Incorrect. You can use SQL to query data in a lake database."
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+
- content: "A relational schema is overlaid on the underlying files, and can be queried using a serverless SQL pool or a Spark pool."
25
+
isCorrect: true
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explanation: "Correct. A lake database abstracts files with a relational schema that can be queried using SQL in a serverless SQL pool or a Spark pool."
27
+
- content: "You need to create a new lake database for a retail solution. What's the most efficient way to do this?"
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choices:
29
+
- content: "Create a sample database in Azure SQL Database and export the SQL scripts to create the schema for the lake database."
30
+
isCorrect: false
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explanation: "Incorrect. A sample Azure SQL database may not meet your needs, and the scripts wouldn't be suitable for a lake database."
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- content: "Start with the Retail database template in Azure Synapse Studio, and adapt it as necessary."
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+
isCorrect: true
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explanation: "Correct. The Gallery in Azure Synapse Studio includes industry-proven database schema templates, including one for retail."
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- content: "Start with an empty database and create a normalized schema."
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+
isCorrect: false
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+
explanation: "Incorrect. While this approach would work, it's more efficient to start from a template."
38
+
- content: "You have Parquet files in an existing data lake folder for which you want to create a table in a lake database. What should you do?"
39
+
choices:
40
+
- content: "Use a CREATE EXTERNAL TABLE AS SELECT (CETAS) query to create the table."
41
+
isCorrect: false
42
+
explanation: "Incorrect. A CETAS statement will move the data and create a table based on the new location."
43
+
- content: "Convert the files in the folder to CSV format."
44
+
isCorrect: false
45
+
explanation: "Incorrect. You can create lake database tables from Parquet files."
46
+
- content: "Use the database designer to create a table based on the existing folder."
47
+
isCorrect: true
48
+
explanation: "Correct. You can add a table to a database from existing files."
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