높은통과율DEA-C01시험대비덤프최신데모덤프공부자료
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Itexamdump Snowflake DEA-C01덤프의 질문들과 답변들은 100%의 지식 요점과 적어도 98%의 시험 문제들을 커버하는,수년동안 가장 최근의Snowflake DEA-C01시험 요점들을 컨설팅 해 온 시니어 프로 IT 전문가들의 그룹에 의해 구축 됩니다. Itexamdump의 IT전문가들이 자신만의 경험과 끊임없는 노력으로 최고의Snowflake DEA-C01학습자료를 작성해 여러분들이Snowflake DEA-C01시험에서 패스하도록 도와드립니다.
Snowflake DEA-C01 시험요강:
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DEA-C01시험대비 덤프 최신 데모 최신 덤프자료
Snowflake DEA-C01인증시험을 어떻게 준비하면 될가 아직도 고민하고 계시죠? 학원에 등록하자니 시간도 없고 돈도 많이 들고 쉽게 엄두가 나지 않는거죠? Itexamdump제품을 구매하신다면 그런 부담을 이제 끝입니다. Itexamdump덤프는 더욱 가까지 여러분들께 다가가기 위하여 그 어느 덤프판매 사이트보다 더욱 저렴한 가격으로 여러분들을 맞이하고 있습니다. Snowflake DEA-C01덤프는Itexamdump제품이 최고랍니다.
최신 SnowPro Advanced DEA-C01 무료샘플문제 (Q42-Q47):
질문 # 42
Which are the two ways to access elements in a JSON object?
- A. use bracket notation to traverse the path in an object:
<col-umn>['<level1_element>']['<level2_element>']. - B. Use dot notation to traverse a path in a JSON object:
<col-umn>:<level1_element>.<level2_element>.<level3_element>. - C. Use SemiColon notation to traverse a path in a JSON object:
<col-umn>:<level1_element>;<level2_element>;<level3_element>. - D. use Curly bracket notation to traverse the path in an object:
<col-umn>{'<level1_element>'}{'<level2_element>'}.
정답:A,B
질문 # 43
A data engineer at a large company needs to create centralized datasets that are optimized for Amazon Redshift performance. The company has multiple downstream teams that use their own AWS accounts and dedicated Amazon Redshift clusters with RA3 nodes. All downstream teams need access to the centralized datasets. Which solution will provide immediate access to the datasets and maintain the current Amazon Redshift performance?
- A. Create a daily extract, transform, and load (ETL) job to unload the data to an Amazon S3 staging area. Instruct the teams to copy the data into their Amazon Redshift clusters.
- B. Set up Amazon Redshift data sharing between the Amazon Redshift producer clusters and the consumer clusters to provide access to the centralized datasets.
- C. Copy the datasets to an Amazon S3 bucket by using the UNLOAD command. Register the table definitions in a dedicated AWS Glue Data Catalog schema. Share the schema with the other AWS accounts by using AWS Lake Formation. Use Amazon Redshift Spectrum to access the data.
- D. Set up an AWS DataSync job that automatically syncs the data between the Amazon Redshift producer clusters and the consumer clusters.
정답:B
설명:
Amazon Redshift data sharing allows multiple Redshift clusters (including across AWS accounts) to access centralized datasets in real time without copying or moving data. This provides immediate access while maintaining performance because queries run directly on the producer cluster's managed storage, eliminating duplication and ETL overhead.
질문 # 44
In Which Data Modelling Technique, Data Engineer generally refer the terms Hubs & Satellites?
- A. Star Schema
- B. Data Hub
- C. Snowflake Schema
- D. Data Vault
정답:D
설명:
Explanation
In Data Vault modelling, Hubs are entities of interest to the business.
They contain just a distinct list of business keys and metadata about when each key was first loaded and from where.
In Data Vault modelling, Satellites connect to Hubs or Links. They are Point in Time: so we can ask and answer the question, "what did we know when?" Satellites contain data about their parent Hub or Link and metadata about when the data was load-ed, from where, and a business effectivity date.
질문 # 45
A company wants to analyze sales records that the company stores in a MySQL database. The company wants to correlate the records with sales opportunities identified by Salesforce.
The company receives 2 GB of sales records every day. The company has 100 GB of identified sales opportunities. A data engineer needs to develop a process that will analyze and correlate sales records and sales opportunities. The process must run once each night.
Which solution will meet these requirements with the LEAST operational overhead?
- A. Use Amazon AppFlow to fetch sales opportunities from Salesforce. Use Amazon Kinesis Data Streams to fetch sales records from the MySQL database. Use Amazon Managed Service for Apache Flink to correlate the datasets. Use AWS Step Functions to orchestrate the process.
- B. Use Amazon AppFlow to fetch sales opportunities from Salesforce. Use AWS Glue to fetch sales records from the MySQL database. Correlate the sales records with sales opportunities. Use AWS Step Functions to orchestrate the process.
- C. Use Amazon AppFlow to fetch sales opportunities from Salesforce. Use AWS Glue to fetch sales records from the MySQL database. Correlate the sales records with the sales opportunities. Use Amazon Managed Workflows for Apache Airflow (Amazon MWAA) to orchestrate the process.
- D. Use Amazon Managed Workflows for Apache Airflow (Amazon MWAA) to fetch both datasets.
Use AWS Lambda functions to correlate the datasets. Use AWS Step Functions to orchestrate the process.
정답:B
설명:
This solution meets the requirements with the least operational overhead by utilizing managed AWS services that simplify the data ingestion, transformation, and orchestration processes:
Amazon AppFlow is a fully managed integration service that allows data ingestion from Salesforce without custom connectors or manual ETL processes.
AWS Glue provides serverless data integration, making it suitable for extracting data from the MySQL database and transforming it as needed.
AWS Step Functions can then be used to orchestrate and automate the nightly process, minimizing the need for complex management.
질문 # 46
What are Common Query Problems a Data Engineer can identified using Query Profiler?
- A. Queries Too Large to Fit in Memory
- B. Inefficient Pruning
- C. "Exploding" Joins i.e Joins resulting due to a "Cartesian product"
- D. Ineffective Data Sharing
정답:A,B,C
설명:
Explanation
"Exploding" Joins
One of the common mistakes SQL users make is joining tables without providing a join condition (resulting in a "Cartesian product"), or providing a condition where records from one table match multiple records from another table. For such queries, the Join operator produces significantly (often by orders of magnitude) more tuples than it consumes.
This can be observed by looking at the number of records produced by a Join operator in the profile interface, and typically is also reflected in Join operator consuming a lot of time.
Queries Too Large to Fit in Memory
For some operations (e.g. duplicate elimination for a huge data set), the amount of memory available for the compute resources used to execute the operation might not be sufficient to hold intermediate results. As a result, the query processing engine will start spilling the data to local disk. If the local disk space is not sufficient, the spilled data is then saved to remote disks.
This spilling can have a profound effect on query performance (especially if remote disk is used for spilling).
Spilling statistics can be checked in Query Profile Interface.
Inefficient Pruning
Snowflake collects rich statistics on data allowing it not to read unnecessary parts of a table based on the query filters. However, for this to have an effect, the data storage order needs to be correlat-ed with the query filter attributes.
The efficiency of pruning can be observed by comparing Partitions scanned and Partitions total sta-tistics in the TableScan operators. If the former is a small fraction of the latter, pruning is efficient. If not, the pruning did not have an effect.
Of course, pruning can only help for queries that actually filter out a significant amount of data. If the pruning statistics do not show data reduction, but there is a Filter operator above TableScan which filters out a number of records, this might signal that a different data organization might be beneficial for this query.
질문 # 47
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