ACA-Database 無料問題集「Alibaba Cloud ACA Database Certification」

（A）ApsaraDB for PolarDB is designed to handle large amounts of sequential queries

（B）ApsaraDB for PolarDB is a cloud-native relational database service that is compatible with the MySQL, PostgreSQL, and Oracle engines

（C）ApsaraDB for PolarDB can scale clusters within a few minutes, recover from failures within a few seconds, and guarantee data consistency

（D）Each ApsaraDB for PolarDB cluster supports up to 100 TB of storage space and can handle up to one million queries per second (QPS)

（E）An ApsaraDB for PolarDB cluster can also be scaled out to a maximum of 16 nodes, and provide up to 6 times of performance improvement traditional MySQL clusters at a 30% to 50% cost reduction

（A）Seconds

（B）Days

（C）Minutes

（D）Hours

（A）DTS cannot be used for incremental database synchronization

（B）DTS can migrate both data and table schema

（C）DTS works for database both on and off Alibaba Cloud

（D）DTS supports multiple database engines

（A）Document-oriented unstructured data

（B）Key-value (KV) data that is frequently read and written

（C）Large amounts of time series data

（D）Structured data in rows and columns

（A）ApsaraDB for MyBase supports the over commitment of CPU and disk resources.

（B）ApsaraDB for MyBase grants you host permissions. You can log on to hosts to troubleshoot business problems in an emergency.

（C）ApsaraDB for MyBase allows you to specify a host when you create an instance.

（D）ApsaraDB for My Base allows you to deploy different types of instances in a cluster.

（E）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.

（A）Performance monitoring

（B）Data structure conversion

（C）Data migration

（D）De-Oracle workload evaluation

（A）PostgreSQL

（B）SQL Server

（C）MySQL

（D）TSDB

（E）Redis

（F）HBase

（G）Oracle

（H）MongoDB

（I）MariaDB

（A）From a different cloud provider to Alibaba Cloud

（B）From RDS to an ECS-based database

（C）From an RDS database, back to itself

（D）From Alibaba Cloud RDS to other database systems