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Databricks Databricks-Certified-Data-Analyst-Associate 시험요강:

주제	소개
주제 1	SQL in the Lakehouse: It identifies a query that retrieves data from the database, the output of a SELECT query, a benefit of having ANSI SQL, access, and clean silver-level data. It also compares and contrasts MERGE INTO, INSERT TABLE, and COPY INTO. Lastly, this topic focuses on creating and applying UDFs in common scaling scenarios.
주제 2	Analytics applications: It describes key moments of statistical distributions, data enhancement, and the blending of data between two source applications. Moroever, the topic also explains last-mile ETL, a scenario in which data blending would be beneficial, key statistical measures, descriptive statistics, and discrete and continuous statistics.
주제 3	Data Management: The topic describes Delta Lake as a tool for managing data files, Delta Lake manages table metadata, benefits of Delta Lake within the Lakehouse, tables on Databricks, a table owner’s responsibilities, and the persistence of data. It also identifies management of a table, usage of Data Explorer by a table owner, and organization-specific considerations of PII data. Lastly, the topic it explains how the LOCATION keyword changes, usage of Data Explorer to secure data.
주제 4	Databricks SQL: This topic discusses key and side audiences, users, Databricks SQL benefits, complementing a basic Databricks SQL query, schema browser, Databricks SQL dashboards, and the purpose of Databricks SQL endpoints warehouses. Furthermore, the delves into Serverless Databricks SQL endpoint warehouses, trade-off between cluster size and cost for Databricks SQL endpoints warehouses, and Partner Connect. Lastly it discusses small-file upload, connecting Databricks SQL to visualization tools, the medallion architecture, the gold layer, and the benefits of working with streaming data.
주제 5	Data Visualization and Dashboarding: Sub-topics of this topic are about of describing how notifications are sent, how to configure and troubleshoot a basic alert, how to configure a refresh schedule, the pros and cons of sharing dashboards, how query parameters change the output, and how to change the colors of all of the visualizations. It also discusses customized data visualizations, visualization formatting, Query Based Dropdown List, and the method for sharing a dashboard.

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최신 Data Analyst Databricks-Certified-Data-Analyst-Associate 무료샘플문제 (Q75-Q80):

질문 # 75
Which of the following is an advantage of using a Delta Lake-based data lakehouse over common data lake solutions?

A. Data deletion
B. ACID transactions
C. Open-source formats
D. Scalable storage
E. Flexible schemas

정답：B

설명：
A Delta Lake-based data lakehouse is a data platform architecture that combines the scalability and flexibility of a data lake with the reliability and performance of a data warehouse. One of the key advantages of using a Delta Lake-based data lakehouse over common data lake solutions is that it supports ACID transactions, which ensure data integrity and consistency. ACID transactions enable concurrent reads and writes, schema enforcement and evolution, data versioning and rollback, and data quality checks. These features are not available in traditional data lakes, which rely on file-based storage systems that do not support transactions. References:
* Delta Lake: Lakehouse, warehouse, advantages | Definition
* Synapse - Data Lake vs. Delta Lake vs. Data Lakehouse
* Data Lake vs. Delta Lake - A Detailed Comparison
* Building a Data Lakehouse with Delta Lake Architecture: A Comprehensive Guide

질문 # 76
In which of the following situations should a data analyst use higher-order functions?

A. When custom logic needs to be converted to Python-native code
B. When custom logic needs to be applied to simple, unnested data
C. When built-in functions are taking too long to perform tasks
D. When built-in functions need to run through the Catalyst Optimizer
E. When custom logic needs to be applied at scale to array data objects

정답：E

설명：
Higher-order functions are a simple extension to SQL to manipulate nested data such as arrays. A higher-order function takes an array, implements how the array is processed, and what the result of the computation will be. It delegates to a lambda function how to process each item in the array. This allows you to define functions that manipulate arrays in SQL, without having to unpack and repack them, use UDFs, or rely on limited built-in functions. Higher-order functions provide a performance benefit over user defined functions. Reference: Higher-order functions | Databricks on AWS, Working with Nested Data Using Higher Order Functions in SQL on Databricks | Databricks Blog, Higher-order functions - Azure Databricks | Microsoft Learn, Optimization recommendations on Databricks | Databricks on AWS

질문 # 77
Which statement describes descriptive statistics?

A. A branch of statistics that uses summary statistics to categorically describe and summarize data.
B. A branch of statistics that uses quantitative variables that must take on a finite or countably infinite set of values.
C. A branch of statistics that uses a variety of data analysis techniques to infer properties of an underlying distribution of probability.
D. A branch of statistics that uses summary statistics to quantitatively describe and summarize data.

정답：D

설명：
Descriptive statistics refer to statistical methods used to describe and summarize the basic features of data in a study. They provide simple summaries about the sample and the measures, often including metrics such as mean, median, mode, range, and standard deviation. Databricks learning materials highlight that descriptive statistics use summary statistics to quantitatively describe and summarize data, providing insight into data distributions without making inferences or predictions.

질문 # 78
A data engineering team has created a Structured Streaming pipeline that processes data in micro-batches and populates gold-level tables. The microbatches are triggered every minute.
A data analyst has created a dashboard based on this gold-level data. The project stakeholders want to see the results in the dashboard updated within one minute or less of new data becoming available within the gold-level tables.
Which of the following cautions should the data analyst share prior to setting up the dashboard to complete this task?

A. The dashboard cannot be refreshed that quickly
B. The gold-level tables are not appropriately clean for business reporting
C. The required compute resources could be costly
D. The streaming data is not an appropriate data source for a dashboard
E. The streaming cluster is not fault tolerant

정답：C

설명：
A Structured Streaming pipeline that processes data in micro-batches and populates gold-level tables every minute requires a high level of compute resources to handle the frequent data ingestion, processing, and writing. This could result in a significant cost for the organization, especially if the data volume and velocity are large. Therefore, the data analyst should share this caution with the project stakeholders before setting up the dashboard and evaluate the trade-offs between the desired refresh rate and the available budget. The other options are not valid cautions because:
B) The gold-level tables are assumed to be appropriately clean for business reporting, as they are the final output of the data engineering pipeline. If the data quality is not satisfactory, the issue should be addressed at the source or silver level, not at the gold level.
C) The streaming data is an appropriate data source for a dashboard, as it can provide near real-time insights and analytics for the business users. Structured Streaming supports various sources and sinks for streaming data, including Delta Lake, which can enable both batch and streaming queries on the same data.
D) The streaming cluster is fault tolerant, as Structured Streaming provides end-to-end exactly-once fault-tolerance guarantees through checkpointing and write-ahead logs. If a query fails, it can be restarted from the last checkpoint and resume processing.
E) The dashboard can be refreshed within one minute or less of new data becoming available in the gold-level tables, as Structured Streaming can trigger micro-batches as fast as possible (every few seconds) and update the results incrementally. However, this may not be necessary or optimal for the business use case, as it could cause frequent changes in the dashboard and consume more resources. Reference: Streaming on Databricks, Monitoring Structured Streaming queries on Databricks, A look at the new Structured Streaming UI in Apache Spark 3.0, Run your first Structured Streaming workload

질문 # 79
A data analyst filters rows where the tags array includes the value ' sql ' using this query:
SELECT *
FROM main.analytics.articles
WHERE tags = ' sql ' ;
This query returns no results.
How should the analyst query to filter for rows where the tags array contains ' sql ' ?

A. SELECT * FROM main.analytics.articles WHERE tags IN ( ' sql ' );
B. SELECT * FROM main.analytics.articles WHERE tags LIKE ' %sql% ' ;
C. SELECT * FROM main.analytics.articles WHERE ' sql ' IN tags;
D. SELECT * FROM main.analytics.articles WHERE array_contains(tags, ' sql ' );

정답：D

설명：
Option D is correct. The column tags is an array, so comparing the entire array to the scalar string ' sql ' is incorrect. The correct Databricks SQL function is array_contains(array, value), which returns true when the array contains the specified value. The uploaded document has a spelling error, array_conatins; the corrected Databricks function name is array_contains. Official Databricks documentation states that array_contains
"returns true if array contains value."

질문 # 80
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