Databricks Certified Data Analyst Associate Test 5

Welcome to your Databricks Certified Data Analyst Test-5

Name

Phone

Q1. How does Delta Lake manage table metadata in Databricks?

Select 1 option(s):

Through manual updates by the database administrator.

Delta Lake does not manage table metadata.

By maintaining a transaction log that records metadata changes.

By storing metadata in a separate, dedicated cloud storage.

By automatically synchronizing metadata with the primary data storage.

Q2. In a data analytics environment, how can dashboards be configured to automatically refresh and display the most current data?

Select 1 option(s):

Automatic refreshes are achieved by scripting a periodic page reload in the web browser displaying the dashboard.

Dashboards must be manually refreshed by the user to display the latest data.

Dashboards automatically refresh only when the underlying data source is replaced with a new one.

Dashboards can be set up to refresh automatically at specified intervals using built-in scheduling features.

Automatic dashboard refreshes require a complete system reboot at regular intervals.

Q3. In a Databricks environment, you‘re analyzing query performance improvements. After several runs of a complex query on a large dataset, you notice a significant reduction in latency. What feature of Databricks is most likely contributing to this decrease in query execution time?

Select 1 option(s):

Improved data indexing mechanisms.

Caching of intermediate data and results from previous query executions.

Automatic query rewriting for optimization.

Use of persistent tables instead of temporary views.

Increased hardware resources allocation.

Q4. In a large-scale Databricks environment, you have a dataset Transactions with a column TransactionAmount. You need to apply a custom scaling function to normalize transaction amounts for analysis.

You decide to create a UDF (User-Defined Function) in Python.
Which of the following approaches correctly illustrates the creation and application of a UDF for this purpose?

Select 1 option(s):

Manually apply the normalization function to each row of the Transactions dataset using a Spark DataFrame loop.

Use a built-in SQL function to normalize TransactionAmount directly within a SQL query without defining a UDF.

Define a Python function normalize(amount) and register it as a UDF, then use SELECT normalize(TransactionAmount) FROM Transactions;.

Implement a machine learning model within Databricks to automatically normalize TransactionAmount.

Create a Python script outside Databricks to preprocess the data, then import the normalized dataset into Databricks.

Q5. A data analyst is tasked with presenting yearly revenue data to stakeholders in a way that is both informative and visually appealing. The analyst decides to use a line graph to show the revenue trends over the year. What is the best approach the analyst should take in terms of formatting the graph?

Select 1 option(s):

Use 3D effects on the graph lines to give a more modern and advanced look.

Apply a minimalistic design with a consistent color scheme and clear labeling to enhance focus on the data.

Incorporate various font styles and sizes for each data point to make the graph more dynamic.

Add multiple background images related to the company‘s business to make the graph more engaging.

Use a wide range of vibrant colors for different data points to make the graph more colorful.

Q6. Which of the following best describes the purpose of descriptive statistics in data analysis?

Select 1 option(s):

To establish causal relationships between different variables.

To categorize data into distinct groups based on algorithmic models.

To make predictions about future trends based on historical data.

To test hypotheses about the relationship between variables.

To summarize and describe the main features of a dataset.

Q7. In managing Databricks SQL endpoints or warehouses, a key consideration is the balance between computational power and cost. Which statement best encapsulates this trade-off?

Select 1 option(s):

Larger clusters offer lower performance but are more cost-effective, ideal for high-volume data processing.

Cluster size impacts only the storage capacity, not the cost or performance.

Cluster size has no impact on cost or performance in Databricks SQL.

Smaller clusters are more expensive and offer high performance, suitable for complex analytics.

Larger clusters enhance performance but increase costs, suitable for demanding data tasks, whereas smaller clusters reduce costs but may limit performance.

Q8. What is the minimum permission a user needs to configure a refresh schedule on a Databricks SQL Dashboard?

Select 1 option(s):

Can Edit.

Owner.

No permissions.

Can View.

Modify Permissions.

Q9. When using the schema browser in the Query Editor of Databricks, what type of information can you expect to find displayed? Choose the most appropriate option.

Select 1 option(s):

A) Only the SQL queries that have been executed in the past sessions.

B) List of all users and groups who have access to the Databricks workspace.

C) Available databases, tables, and columns, along with their data types.

D) Real-time performance metrics and logs of the Databricks cluster.

E) Detailed documentation and syntax for all SQL functions and commands.

Q10. In Databricks, how do you identify the owner of a table using Catalog Explorer?

Select 1 option(s):

The owner is displayed when clicking on a table in the Catalog Explorer.

By executing a SQL query in Catalog Explorer to retrieve the table owner.

By inspecting the table‘s creation script in Catalog Explorer.

Table ownership is not visible in Catalog Explorer.

Through the ‘Owner‘ column in the Catalog Explorer‘s table list.

Q11. How do Delta Lake tables in Databricks maintain their historical data?

Select 1 option(s):

By storing historical data in a separate cloud storage.

By maintaining a versioned history of data changes for a configurable period of time.

Delta Lake tables do not maintain historical data.

Through automatic backups at regular intervals.

By creating a new table for each update.

Q12. You are analyzing a dataset in Databricks SQL named WeatherReadings which includes the columns StationID (integer), ReadingTimestamp (timestamp), and Temperature (float).

You need to calculate the average temperature for each station in 1-hour windows, sliding every 30 minutes. Which SQL query correctly uses the windowing function to achieve this?

Select 1 option(s):

SELECT StationID, AVG(Temperature) OVER (PARTITION BY StationID, window(ReadingTimestamp, ‘1 hour‘, ‘30 minutes‘)) FROM WeatherReadings;

SELECT StationID, window(ReadingTimestamp, ‘1 hour‘), AVG(Temperature) FROM WeatherReadings GROUP BY StationID, window(ReadingTimestamp, ‘1 hour‘);

SELECT StationID, AVG(Temperature) OVER (PARTITION BY StationID ORDER BY ReadingTimestamp ROWS BETWEEN INTERVAL ‘30 minutes‘ PRECEDING AND INTERVAL ‘30 minutes‘ FOLLOWING) FROM WeatherReadings;

SELECT StationID, AVG(Temperature) OVER (PARTITION BY StationID ORDER BY ReadingTimestamp RANGE BETWEEN INTERVAL 1 HOUR PRECEDING AND CURRENT ROW) FROM WeatherReadings;

SELECT StationID, window(ReadingTimestamp, ‘1 hour‘, ‘30 minutes‘), AVG(Temperature) FROM WeatherReadings GROUP BY StationID, window(ReadingTimestamp, ‘1 hour‘, ‘30 minutes‘);

Q13. In the context of Databricks, when dealing with the import of small text files, such as lookup tables or for quick data integrations, which approach is recommended to optimize performance and ease of use?

Select 1 option(s):

Utilize large-file upload methods for all types of data, regardless of file size.

Always compress text files into larger archives before uploading, regardless of the original file size.

Upload small text files to a temporary storage service before importing them into Databricks.

Convert small text files to a binary format to increase upload speed and efficiency.

Employ small-file upload techniques specifically designed for handling small text files efficiently.

Q14. In the realm of data visualization and analysis, Databricks SQL dashboards serve a specific purpose. What is the primary function of Databricks SQL dashboards in the context of data query results?

Select 1 option(s):

To showcase the results of multiple SQL queries simultaneously in a unified view.

To store raw data for long-term archival purposes.

To serve as an interactive platform for writing and testing new SQL queries.

To execute real-time data transformations without displaying results.

To display the output of a single, complex SQL query.

Q15. In the Databricks Unity Catalog, which SQL command correctly creates a new table named customer_data in a database sales under the catalog us_catalog, based on a SELECT query from an existing table transactions in the same database and catalog?

Select 1 option(s):

CREATE TABLE customer_data IN us_catalog.sales AS SELECT * FROM transactions;

TABLE CREATE us_catalog.sales.customer_data AS (SELECT * FROM transactions);

NEW TABLE us_catalog.sales.customer_data FROM SELECT * IN transactions;

CREATE TABLE us_catalog.sales.customer_data AS SELECT * FROM us_catalog.sales.transactions;

us_catalog.sales: CREATE TABLE customer_data AS SELECT * FROM transactions;

Q16. Consider the following two tables:

Table 1: Employees

Table 2: Departments

Given the output from joining both tables:

Which of the queries below could have been used to generate the output?

Select 1 option(s):

SELECT Employees.Name, Departments.Department
FROM Employees
FULL JOIN Departments ON Employees.EmployeeID = Departments.EmployeeID;

SELECT Employees.Name, Departments.Department
FROM Employees
RIGHT JOIN Departments ON Employees.EmployeeID = Departments.EmployeeID;

SELECT *
FROM Employees
RIGHT JOIN Departments ON Employees.EmployeeID = Departments.EmployeeID;

SELECT Employees.Name, Departments.Department
FROM Employees
LEFT JOIN Departments ON Employees.EmployeeID = Departments.EmployeeID;

SELECT *
FROM Employees
LEFT JOIN Departments ON Employees.EmployeeID = Departments.EmployeeID;

Q17. Consider the following two tables:

Colors Table:

Shapes Table:

After executing an SQL JOIN query, you receive the following result:

What type of JOIN was used to produce this result?

Select 1 option(s):

RIGHT JOIN

FULL JOIN

INNER JOIN

CROSS JOIN

LEFT JOIN

Q18. In data analytics, identify a scenario where data enhancement would significantly improve the outcome.

Select 1 option(s):

When aggregating large volumes of data for storage efficiency without analysis.

When performing routine data backup and recovery processes.

In a marketing campaign, to enrich customer data with additional demographic and psychographic information for targeted advertising.

During the initial stages of data collection where data volume is more critical than data quality.

When migrating data from one storage system to another without changing its format or content.

Q19. In a business analytics context, which scenario best illustrates the beneficial use of data blending?

Select 1 option(s):

Archiving old data from different systems without analysis.

Merging customer feedback data with sales figures to gain insights into product performance.

Updating system software while keeping the data unchanged.

Analyzing employee performance using data from a single internal application.

Strictly using financial data for annual budget forecasting.

Q20. What is a key benefit of using ANSI SQL as the standard query language in the Lakehouse architecture?

Select 1 option(s):

It ensures compatibility and interoperability across different database systems.

It enables automatic data encryption and security.

It provides enhanced graphical data visualization tools.

It allows for real-time data streaming and complex event processing.

It supports native machine learning algorithms.

Q21. How do you set the location of a table in Databricks when creating or altering it?

Select 1 option(s):

By specifying the location in the Databricks UI during table creation.

By using the CREATE TABLE ... LOCATION or ALTER TABLE ... SET LOCATION command.

Location setting is not supported in Databricks.

By using the SET LOCATION command in the table creation query.

By moving the data files to the desired location manually.

Q22. In the context of analytics, what is an example of effectively enhancing data in a common application?

Select 1 option(s):

Integrating weather data into a retail sales analysis to understand the impact of weather on sales trends.

Keeping data in its original, raw format for archival purposes.

Restricting data access to a limited number of users to ensure data security.

Strictly categorizing data based on its source without additional processing.

Performing routine software updates on data analysis tools without modifying data.

Q23. In the context of a Databricks Lakehouse architecture, you are working with silver-level data that has been aggregated from various bronze tables.

You notice inconsistencies in customer names due to variations in casing and spacing (e.g., ‘John Doe‘, ‘john doe‘, ‘John Doe‘).
What would be an appropriate SQL query to standardize these customer names in the silver table CustomerData?

Select 1 option(s):

Q24. What are the key differences in behavior between managed and unmanaged tables in Databricks?

Select 1 option(s):

Unmanaged tables are optimized for streaming data, whereas managed tables are not.

Managed tables automatically back up data, whereas unmanaged tables require manual backups.

Managed tables store their data in a default location managed by Databricks, while unmanaged tables allow specifying a storage location.

Managed tables can only store structured data, while unmanaged tables can store both structured and unstructured data.

Managed tables support ACID transactions, while unmanaged tables do not.

Q25. You are working with a sales data table in Databricks SQL that contains columns for Region, Product, and SalesAmount. You want to generate a report that includes the total sales amount for each combination of Region and Product, as well as the total for each Region and the overall total.

Which SQL query would you use to achieve this?

Select 1 option(s):

SELECT Region, Product, SUM(SalesAmount) FROM sales GROUP BY ROLLUP(Region, Product);

SELECT Region, Product, SUM(SalesAmount) FROM sales GROUP BY CUBE(Region, Product);

SELECT Region, Product, SUM(SalesAmount) FROM sales GROUP BY Region, Product WITH ROLLUP;

SELECT Region, Product, SUM(SalesAmount) FROM sales GROUP BY GROUPING SETS ((Region, Product), (Region), ());

SELECT Region, Product, SUM(SalesAmount) FROM sales GROUP BY Region, Product WITH CUBE;

Q26. In Databricks, what distinguishes a managed table from an unmanaged (external) table in terms of data and metadata management?

Select 1 option(s):

Managed tables allow for external file storage, whereas unmanaged tables store data within the Databricks environment.

Unmanaged tables enable ACID transactions, unlike managed tables.

Managed tables have their data and metadata managed by Databricks, while unmanaged tables have only metadata managed.

Managed tables store both data and metadata in the cloud, while unmanaged tables store only metadata.

Managed tables require manual data deletion after dropping the table, whereas unmanaged tables automatically delete data.

Q27. In data engineering, how is “performing last-mile ETL as project-specific data enhancement“ best described?

Select 1 option(s):

Implementing general ETL processes applicable to all datasets across the organization.

Utilizing advanced data analytics techniques to generate predictive insights.

Migrating all data to a centralized data warehouse for unified access.

Conducting final data transformations and enrichments specific to the needs of a particular project.

Performing initial data extraction from various source systems into a staging area.

Q28. Which of the following features is a primary function of the Catalog Explorer in Databricks?

Select 1 option(s):

Automatically transforming data into normalized forms for analysis.

Scheduling and automating data pipeline workflows.

Previewing and exploring data, along with configuring security and access controls.

Executing complex machine learning algorithms on large datasets.

Generating real-time analytics and visualizations without the need for coding.

Q29. A data analyst at an e-commerce company is using Databricks SQL to visualize customer feedback scores (ranging from 1 to 5) against product categories. The analyst wants to identify patterns and outliers in the feedback scores across different categories. Which visualization type should the analyst select in Databricks SQL to effectively communicate these insights?

Select 1 option(s):

Treemap, to represent feedback scores as proportions within each category.

Bubble chart, for showing the volume of feedback in relation to scores across categories.

Radar chart, to compare the feedback scores of different categories in a circular format.

Stacked bar chart, for showing the total feedback scores by category.

Box chart, to display the distribution of feedback scores within each category, highlighting the median, quartiles, and outliers.

Q30. Assuming you have a table TrafficData with columns Timestamp (timestamp) and VehicleCount (integer), and you need to calculate the sum of VehicleCount for every 10-minute window.

Which SQL query using the window_time function correctly achieves this in a Databricks environment?

Select 1 option(s):

SELECT window_time(Timestamp, ‘10 minutes‘), COUNT(VehicleCount) FROM TrafficData GROUP BY Timestamp;

SELECT Timestamp, SUM(VehicleCount) OVER (ORDER BY Timestamp RANGE BETWEEN INTERVAL 10 MINUTES PRECEDING AND CURRENT ROW) FROM TrafficData;

SELECT window_time(Timestamp, ‘10 minutes‘), AVG(VehicleCount) FROM TrafficData GROUP BY window_time(Timestamp, ‘10 minutes‘);

SELECT Timestamp, SUM(VehicleCount) OVER (PARTITION BY window_time(Timestamp, ‘10 minutes‘)) FROM TrafficData;

SELECT window_time(Timestamp, ‘10 minutes‘), SUM(VehicleCount) FROM TrafficData GROUP BY window_time(Timestamp, ‘10 minutes‘);

Q31. In the context of Databricks dashboards, how do query parameters influence the output of underlying SQL queries within a dashboard?

Select 1 option(s):

Query parameters serve as placeholders in SQL queries, allowing for dynamic data filtering based on user input, thus altering the output of the query according to the specified parameter values.

They automatically update the SQL queries on a set schedule, such as daily or weekly, to change the output data based on temporal parameters.

They modify the layout of the dashboard, rearranging the visualizations based on user preferences, but do not change the data output of the queries.

Query parameters are used to format the visual aspects of the output, such as color and font, without changing the actual data returned by the query.

Query parameters act as static reference points in SQL queries, ensuring that the output remains constant irrespective of user interactions.

Q32. In the context of Databricks, what is the primary advantage of using a Serverless Databricks SQL endpoint/warehouse?

Select 1 option(s):

It provides a dedicated environment for developing complex data pipelines and ETL processes.

It enables quick-start capabilities, significantly reducing the time to initiate SQL queries and data analysis tasks.

It specializes in real-time data streaming and complex event processing for IoT applications.

It is primarily designed for large-scale machine learning workloads requiring extensive computational resources.

It offers enhanced data security and privacy controls suitable for sensitive data processing.

Q33. In Databricks SQL, when alerts are configured based on specific criteria, how are notifications typically sent to inform users or administrators of the triggered alerts?

Select 1 option(s):

Alerts generate a pop-up notification within the Databricks SQL Analytics interface, visible to all users.

Alerts trigger notifications via a variety of channels, such as email, Slack, or webhook integrations, based on the defined configuration.

Notifications are sent through SMS messages to designated phone numbers when alerts are triggered.

Notifications are not supported for alerts in Databricks SQL Analytics.

Notifications are automatically sent to the dashboard‘s viewers via email when alerts are triggered.

Databricks Certified Data Analyst Associate Test 5

Q1. How does Delta Lake manage table metadata in Databricks?

Q2. In a data analytics environment, how can dashboards be configured to automatically refresh and display the most current data?

Q3. In a Databricks environment, you‘re analyzing query performance improvements. After several runs of a complex query on a large dataset, you notice a significant reduction in latency. What feature of Databricks is most likely contributing to this decrease in query execution time?

Q4. In a large-scale Databricks environment, you have a dataset Transactions with a column TransactionAmount. You need to apply a custom scaling function to normalize transaction amounts for analysis.

Q6. Which of the following best describes the purpose of descriptive statistics in data analysis?

Q7. In managing Databricks SQL endpoints or warehouses, a key consideration is the balance between computational power and cost. Which statement best encapsulates this trade-off?

Q8. What is the minimum permission a user needs to configure a refresh schedule on a Databricks SQL Dashboard?

Q9. When using the schema browser in the Query Editor of Databricks, what type of information can you expect to find displayed? Choose the most appropriate option.

Q10. In Databricks, how do you identify the owner of a table using Catalog Explorer?

Q11. How do Delta Lake tables in Databricks maintain their historical data?

Q12. You are analyzing a dataset in Databricks SQL named WeatherReadings which includes the columns StationID (integer), ReadingTimestamp (timestamp), and Temperature (float).

Q13. In the context of Databricks, when dealing with the import of small text files, such as lookup tables or for quick data integrations, which approach is recommended to optimize performance and ease of use?

Q14. In the realm of data visualization and analysis, Databricks SQL dashboards serve a specific purpose. What is the primary function of Databricks SQL dashboards in the context of data query results?

Q15. In the Databricks Unity Catalog, which SQL command correctly creates a new table named customer_data in a database sales under the catalog us_catalog, based on a SELECT query from an existing table transactions in the same database and catalog?

Q16. Consider the following two tables:

Q17. Consider the following two tables:

Q18. In data analytics, identify a scenario where data enhancement would significantly improve the outcome.

Q19. In a business analytics context, which scenario best illustrates the beneficial use of data blending?

Q20. What is a key benefit of using ANSI SQL as the standard query language in the Lakehouse architecture?

Q21. How do you set the location of a table in Databricks when creating or altering it?

Q22. In the context of analytics, what is an example of effectively enhancing data in a common application?

Q23. In the context of a Databricks Lakehouse architecture, you are working with silver-level data that has been aggregated from various bronze tables.

Q24. What are the key differences in behavior between managed and unmanaged tables in Databricks?

Q25. You are working with a sales data table in Databricks SQL that contains columns for Region, Product, and SalesAmount. You want to generate a report that includes the total sales amount for each combination of Region and Product, as well as the total for each Region and the overall total.

Q26. In Databricks, what distinguishes a managed table from an unmanaged (external) table in terms of data and metadata management?

Q27. In data engineering, how is “performing last-mile ETL as project-specific data enhancement“ best described?

Q28. Which of the following features is a primary function of the Catalog Explorer in Databricks?

Q30. Assuming you have a table TrafficData with columns Timestamp (timestamp) and VehicleCount (integer), and you need to calculate the sum of VehicleCount for every 10-minute window.

Q31. In the context of Databricks dashboards, how do query parameters influence the output of underlying SQL queries within a dashboard?

Q32. In the context of Databricks, what is the primary advantage of using a Serverless Databricks SQL endpoint/warehouse?

Q33. In Databricks SQL, when alerts are configured based on specific criteria, how are notifications typically sent to inform users or administrators of the triggered alerts?

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