Free ACA Database Exam ACA-Database Exam Practice Test

Which of the following are the core technologies behind Database Backup Service? (Number of correct answers: 3)

• Multi-cloud and multi-backend backup
  
• Real-time synchronization
  
• High mount speeds (a few seconds)
  
• Online query and analysis
  

Which of the following is the high-availability service level that is specified in the ApsaraDB RDS Service Level Agreement (SLA)?

• 90%
  
• 99%
  
• 99.5%
  
• 99.99%
  

With ApsaraDB for MyBase, problems caused by a sudden spike in traffic are automatically resolved. How is this done?

• ApsaraDB for My Base allows you to deploy different types of instances in a cluster.
  
• ApsaraDB for MyBase grants you host permissions. You can log on to hosts to troubleshoot business problems in an emergency.
  
• ApsaraDB for MyBase supports the over commitment of CPU and disk resources.
  
• ApsaraDB for MyBase supports elastic upgrade policies. If the resource utilization of a database exceeds the preset threshold during a business peak, ApsaraDB for MyBase can automatically upgrade database resource specifications to respond to the business peak.
  
• ApsaraDB for MyBase allows you to specify a host when you create an instance.
  

Which of the following architectures are supported by ApsaraDB for Redis Enhanced Edition (Tair)? (Number of correct answers: 3)

• Master-replica architecture in which standard master-replica instances are deployed
  
• Read/write splitting architecture in which standard master-replica instances are deployed
  
• Cluster master-replica instances
  
• Single-node architecture
  

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?

• PolarDB MySQL
  
• PolarDB PosgreSQL
  
• PolarDB Oracle
  
• PolarDB Box
  

Which of the following statements about the compatibility of AnalyticDB for PostgreSQL is NOT true?

• Support for the Java Database Connectivity (JDBC) protocol
  
• Support for the SQL2003 syntax standard
  
• Compliance with PostgreSQL and Greenplum protocols
  
• Fully compatible with Oracle syntax
  

Alibaba Cloud DTS (Database Transmission Service) only supports MySQL databases.

• True
  
• False
  

Which of the following features are provided by PolarDB-O's proxy? (Number of correct answers: 4)

• Read/write splitting
  
• Load balancing
  
• Health checks for nodes
  
• Failover strategies for high availability
  
• Data encryption
  

Alibaba Cloud DTS (Data Transmission Service) supports both full database migration and incremental synchronization.

• True
  
• False
  

Which of the following is the most efficient backup in ApsaraDB for MongoDB?

• Logical backup
  
• Physical backup
  
• Snapshot backup
  
• Full backup