ACA-Database

Which database utility is used for data migration and synchronization?A . DMSB . DBSC . DTSD . DASE . ADAMView AnswerAnswer: C Explanation: Data Transmission Service is charged based according to three models: Data Synchronization, Data Migration, Change Tracking. https://www.alibabacloud.com/product/data-transmission-service/pricing

Which of the following computing capabilities are supported by AnalyticDB? (Number of correct answers: 4)A . Complex extract, transform, load (ETL)B . Interactive analysisC . Simple point queryD . Real-time updateE . Machine LearningView AnswerAnswer: A,B,D,E

You are using DTS to migrate from a MySQL database installed on an ECS instance to a target database on RDS. In the DTS console, which of these is the correct "Instance Type" for the database?A . ECS-based DatabasesB . Express Connect DBC . RDS InstanceD . ApsaraDB MongoDBView AnswerAnswer:...

Alibaba Cloud DTS (Data Transmission Service) can only migrate between databases that are hosted on RDS.A . TrueB . FalseView AnswerAnswer: B Explanation: Alibaba Cloud Data Transmission Service (DTS) helps you migrate data between data stores, such as relational databases, NoSQL databases, and data warehouses. You can use DTS to...

Which of the following statements about MongoDB is NOT true?A . MongoDB is a relational database.B . MongoDB is a document database.C . MongoDB supports transactions.D . MongoDB can be deployed in cluster mode.View AnswerAnswer: A

Which of the following is not a component of the PolarDB-0 architecture in Apsara Stack?A . FC SwitchB . SANC . ProxyD . RDMAView AnswerAnswer: B

Each PolarDB cluster consists of one primary node and one or more read-only nodes. The system only support manually switch over services from the primary node to a read-only node.A . TrueB . FalseView AnswerAnswer: B Explanation: PolarDB cluster supports Manually and Automatically switch over services between primary and read-only...

PolarDB for MySQL archive databases use log-structured merge-trees (LSM trees) and the Zstandard (ZSTD) data compression algorithm to increase the data compression ratio . How much storage can be saved, at most?A . 40%B . 50%C . 60%D . 70%View AnswerAnswer: D

If a database exception occurs in a PolarDB cluster because important data is deleted by mistake, how i can data be restored?A . Level-2 backup + Redo logB . Level 1 backup + Redo logC . Level-2 backupD . Level-1 backupView AnswerAnswer: A

What does DIM mean in data warehouse terms?A . Dimension tableB . Operational data store (ODS)C . Common data model (CDM)D . Application data service (ADS)View AnswerAnswer: A