Free ACA Storage and Networking Questions and Answers — Questions and Answers
Question 1: A/An _________________ is a copy of data on a disk at a certain point in time.
- image
- snapshot (Correct answer)
- template
- EIP
Correct answer: snapshot
Explanation: <br> A snapshot is a point-in-time copy of data on a disk. It captures the state of the disk at the moment the snapshot is taken, allowing you to create a backup or restore the data to that specific state if needed. Snapshots are commonly used for data backup, disaster recovery, and creating consistent images of data for testing or development purposes.
Question 2: Which method is not supported by OSS to create a bucket?
- Through OSS API/SDK
- Through ECS instance filesystem directory operation
- Through the OSS cmd tool (Correct answer)
- Through a cloud console
Correct answer: Through the OSS cmd tool
Explanation: <br> "Through OSS cmd tool," is not supported because OSS cmd tools typically focus on managing objects within buckets rather than creating buckets directly.
Question 3: A large shopping mall deploys a new video surveillance system. The five-floor building in which the mall is located installed 35 HD cameras to monitor the major exits. The surveillance system is deployed on an ECS instance, which has four 2 TB data disks to store video data. However, video data grows rapidly and the engineers find that the ECS will run out of storage space within 2 weeks. <br><br> In this case, _____________ product is thought to be the best solution for addressing the storage challenge while ensuring quick access to historical video data when needed.
- Container Service
- ECS
- OSS (Correct answer)
- CDN
Correct answer: OSS
Explanation: <br> OSS is the best solution because it provides scalable and durable storage for rapidly growing video data, ensuring quick access to historical footage when needed.
Question 4: Which node type in DataWorks can edit the Python code to operate data in MaxCompute?
- PyODPS Node (Correct answer)
- SQL Node
- Data Integration Node
- Data Analytics Node
Correct answer: PyODPS Node
Explanation: <br> The PyODPS Node in DataWorks allows users to edit Python code to operate data in MaxCompute. This node type provides the capability to write custom Python scripts for data processing, analysis, and manipulation tasks within the DataWorks environment, enabling advanced data processing operations on MaxCompute tables.
Question 5: DataWorks provides two billing methods: Pay-As-You-Go (post-payment) and subscription (pre-payment). When DataWorks is activated in pay-as-you-go mode, which of the following billing items will not apply?
- Data integration tasks executed
- Task nodes created by developers (Correct answer)
- Resources consumed by data development and debugging
- Storage costs for project data
Correct answer: Task nodes created by developers
Explanation: <br> When DataWorks is activated in pay-as-you-go mode, the billing is based on resources consumed by data development and debugging, data integration tasks executed, and storage costs for project data. Task nodes created by developers do not incur additional billing costs; they are included in the pay-as-you-go pricing model and are not billed separately.
Question 6: There are three types of node instances in an E-MapReduce cluster: master, core, and _____.
- Compute
- Edge
- Task (Correct answer)
- Gateway
Correct answer: Task
Explanation: <br> In an E-MapReduce cluster, the three types of node instances are master, core, and task. The task nodes are responsible for executing computation tasks in the cluster, processing data, and running MapReduce jobs. They work in conjunction with the master and core nodes to efficiently process and analyze data on the Alibaba Cloud platform.
Question 7: Where is the metadata (e.g., table schemas) in Hive stored?
- Stored in the RDBMS like MySQL (Correct answer)
- Stored in the Hadoop Distributed File System (HDFS)
- Stored in the Hive metastore database
- Stored in the cloud storage like Alibaba Cloud OSS
Correct answer: Stored in the RDBMS like MySQL
Explanation: <br> In Hive, metadata such as table schemas, column names, and data types are stored in an RDBMS like MySQL, which serves as the Hive metastore database. The metastore database acts as a central repository for storing metadata related to Hive tables and partitions. This architecture allows Hive to separate metadata management from data storage, providing scalability and flexibility in managing large datasets.
Question 8: Your company stores user profile records in an OLTP database. You want to join these records with web server logs you have already ingested into the Hadoop file system. What is the best way to obtain and ingest these user records?
- Ingest using Hive (Correct answer)
- Ingest using Apache HBase
- Ingest using Apache Spark
- Ingest using Apache Kafka
Correct answer: Ingest using Hive
Explanation: <br> Ingesting user profile records from an OLTP database into the Hadoop file system can be efficiently achieved using Hive. Hive provides a convenient SQL-like interface to query and process data stored in Hadoop, allowing you to create external tables that reference data in the OLTP database and then ingest it into the Hadoop file system. This approach facilitates data integration and enables you to join the user profile records with web server logs for analysis and insights.
Question 9: When odpscmd is used to connect to a project in MaxCompute, the command ______ can be executed to view the size of the space occupied by table table_a.
- desc table_a;
- show table table_a;
- analyze table table_a;
- size table_a; (Correct answer)
Correct answer: size table_a;
Explanation: <br> In MaxCompute, when using odpscmd to connect to a project, the command "size table_a;" can be executed to view the size of the space occupied by table table_a. This command provides information about the storage consumption of the specified table, helping users to monitor and manage their data resources effectively.
Question 10: In a MaxCompute command line, if you want to view all tables in a project, you can execute the command:
- show tables;
- list tables;
- describe tables;
- desc tables; (Correct answer)
Correct answer: desc tables;
Explanation: <br> In MaxCompute, to view all tables in a project from the command line, you can execute the command "desc tables;". This command describes or displays information about all the tables available in the specified project, providing users with details such as table names, columns, and data types.
Question 11: MaxCompute is a general purpose, fully managed, multi-tenancy data processing platform for large-scale data warehousing, and it is mainly used for storage and computing of batch structured data. Which of the following is not a use case for MaxCompute?
- ETL (Extract, Transform, Load)
- Data Analysis and Mining
- Real-time Stream Processing
- Date Warehouse (Correct answer)
Correct answer: Date Warehouse
Explanation: <br> MaxCompute is primarily used for ETL (Extract, Transform, Load), data analysis and mining, and real-time stream processing tasks. While it can support data warehousing activities to some extent, it is not typically the primary use case for MaxCompute. Data warehousing solutions may involve other technologies or specialized platforms tailored specifically for data warehousing purposes.
Free ACA Storage and Networking Questions and Answers
A/An _________________ is a copy of data on a disk at a certain point in time.