ACA-Database PDF Exam Material 2021 Realistic ACA-Database Dumps Questions
Updated Alibaba Cloud ACA-Database Dumps – PDF & Online Engine
NEW QUESTION 22
If you have a development team with several developers working on cloud databases, which product is recommended to use for development collaboration?
- A. DMS
- B. DTS
- C. DBS
- D. DAS
- E. DG
Answer: A
Explanation:
Explanation
A series of step-based solutions for R&D processes, data security, and data development are provided in the Data Management (DMS) console to get you started with DMS.
https://www.alibabacloud.com/help/doc-detail/190124.htm?spm=a2c63.p38356.b99.40.6ad93d19Xe9h14
NEW QUESTION 23
PolarDB for MySQL allows you to deploy a cluster across multiple zones. Compared with single-zone clusters, multi-zone clusters have better disaster recovery capabilities and can withstand data centre-level faults.
- A. True
- B. False
Answer: A
Explanation:
Explanation
Compared with single-zone clusters, multi-zone clusters can enhance disaster recovery capabilities and withstand the breakdown of an entire data center.
https://www.alibabacloud.com/help/doc-detail/122182.htm?spm=a2c63.p38356.879954.4.6f2fa25362cz60#task-
NEW QUESTION 24
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. 70%
- C. 50%
- D. 60%
Answer: B
NEW QUESTION 25
Which database utility is used for data migration and synchronization?
- A. DMS
- B. DBS
- C. DAS
- D. ADAM
- E. DTS
Answer: E
Explanation:
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
NEW QUESTION 26
Which of these are NOT good use cases for DTS (Data Transmission Service)? (Number of correct answers: 2)
- A. Saving database logs
- B. Full database synchronization for database migration
- C. Incremental synchronization for disaster recovery
- D. Undoing changes made to a database by mistake
Answer: A,D
NEW QUESTION 27
Which of the following statements about the compatibility of AnalyticDB for PostgreSQL is NOT true?
- A. Support for the Java Database Connectivity (JDBC) protocol
- B. Fully compatible with Oracle syntax
- C. Support for the SQL2003 syntax standard
- D. Compliance with PostgreSQL and Greenplum protocols
Answer: B
NEW QUESTION 28
Which of the following architectures are supported by ApsaraDB for Redis Enhanced Edition (Tair)? (Number of correct answers: 3)
- A. Master-replica architecture in which standard master-replica instances are deployed
- B. Read/write splitting architecture in which standard master-replica instances are deployed
- C. Single-node architecture
- D. Cluster master-replica instances
Answer: A,B,D
NEW QUESTION 29
Which of the following computing capabilities are supported by AnalyticDB? (Number of correct answers: 4)
- A. Interactive analysis
- B. Simple point query
- C. Real-time update
- D. Machine Learning
- E. Complex extract, transform, load (ETL)
Answer: A,C,D,E
NEW QUESTION 30
Which of the following data is not collected when database information is collected in Advanced Database & Application Migration (ADAM)?
- A. Database configuration data
- B. Historical performance data
- C. Business data
- D. Business structure data
Answer: C
NEW QUESTION 31
Alibaba Cloud DTS (Data Transmission Service) supports both full database migration and incremental synchronization.
- A. True
- B. False
Answer: A
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/176633.htm?spm=a2c63.p38356.b99.32.3e751a4dtHm9cr /
https://www.alibabacloud.com/help/doc-detail/56776.htm?spm=a2c63.p38356.b99.181.74896b5dro6cDo
NEW QUESTION 32
PolarDB for MySQL uses shared distributed storage and supports dual-zone deployment by default. How many data replicas are available across the two zones?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION 33
Which of the following statements about AnalyticDB for MySQL is true?
- A. AnalyticDB for MySQL supports transactions.
- B. AnalyticDB for MySQL is a NoSQL database.
- C. AnalyticDB for MySQL can be used to build online transaction systems.
- D. AnalyticDB for MySQL can be used to build enterprise-grade data warehouse projects.
Answer: D
NEW QUESTION 34
Which of the following statements about Data Transmission Service (DTS) migration scenarios is NOT true?
- A. DTS can migrate data from one source database to several destination databases, for example, A > B and A > C.
- B. DTS can migrate data from several source databases to one destination database, for example, A > C and B > C.
- C. DTS can migrate data from one source database to one destination database, for example, A > B.
- D. DTS can migrate data in a circular way, for example, A > B > C > A.
Answer: D
NEW QUESTION 35
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. True
- B. False
Answer: B
Explanation:
Explanation
PolarDB cluster supports Manually and Automatically switch over services between primary and read-only nodes.
https://www.alibabacloud.com/help/doc-detail/141229.htm?spm=a2c63.p38356.b99.113.36df231dK2DVX0
NEW QUESTION 36
Suppose you are using MySQL currently, if you want to migrate to cloud native database PolarDB with little effort, which one is the best choice?
- A. PolarDB Oracle
- B. PolarDB Box
- C. PolarDB PosgreSQL
- D. PolarDB MySQL
Answer: D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/58768.htm?spm=a2c63.l28256.b99.10.71ce3784cXj0y8
NEW QUESTION 37
Which of the following are reasonable Data Transmission Service (DTS) use cases? (Number of correct answers: 4)
- A. Geo-disaster recovery and active geo-redundancy for databases
- B. Configuring data audit rules to manage data quality.
- C. Synchronizing data to data warehouses in real time to build data warehouses for real-time analytics.
- D. Change tracking and data distribution.
- E. Synchronizing information about user accounts and permissions.
- F. Database migration without interrupting services / downtime
Answer: A,D,F
NEW QUESTION 38
Which of the following statements about Alibaba Cloud ApsaraDB for MongoDB is true?
- A. Alibaba Cloud and MongoDB have a strategic partnership, so Alibaba Cloud Is able to provide the latest MongoDB features in our ApsaraDB for MongoDB product, in all our global regions.
- B. DataWorks is not supported for MongoDB data processing.
- C. It takes a longer time to perform operations and maintenance (O&M) on ApsaraDB for MongoDB instances than on self-installed and self-managed MongoDB.
Answer: A
NEW QUESTION 39
What is the maximum number of read-only nodes in a PolarDB cluster?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION 40
Your DTS (Data Transmission Service) migration has failed halfway through: what options do you have? (Number of correct answers: 2)
- A. Your database can't be migrated: you need to abandon the migration
- B. Restart the migration task from the console
- C. Delete your DTS instance and start over
- D. You need to switch to ADAM, as DTS cannot complete the migration
Answer: B,D
NEW QUESTION 41
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 Databases
- B. ApsaraDB MongoDB
- C. Express Connect DB
- D. RDS Instance
Answer: D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/96154.htm?spm=a2c63.p38356.b99.118.59de5d1aWUVErx
NEW QUESTION 42
Which of the following statements is NOT correct about the benefits you can gain through PolarDB?
- A. locked backup
- B. Elastic scaling within minutes
- C. When you add a read-only node in an ApsaraDB for PolarDB cluster, you only need to pay for computing resources
- D. Millisecond-level latency in physical replication
- E. Large storage space
Answer: A
Explanation:
Explanation
Lock-free backup.
https://www.alibabacloud.com/help/doc-detail/58768.htm?spm=a2c63.p38356.b99.10.1bcb7338k86bX5
NEW QUESTION 43
Which of the following types of data are most suitable for storage in MySQL databases?
- A. Document-oriented unstructured data
- B. Large amounts of time series data
- C. Structured data in rows and columns
- D. Key-value (KV) data that is frequently read and written
Answer: C
NEW QUESTION 44
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