ACA-Database ACA Database Certification Questions and Answers

A PolarDB cluster contains one primary instance and up to 15 read-only instances

PolarDB consolidate compute processes and storage processes in one box, allowing the database capacity to scale up and down to meet your

application needs in Alibaba Cloud

Read/write splitting is enabled for PolarDB clusters by default, providing transparent, highly available, and self-adaptive load balancing for your

database

High speed network connection is enabled between the DB server and the chunk server, and data are transferred using the Remote Direct Memory Access (RDMA) protocol

Standalone instance

Primary/secondary instance that consists of two nodes

Replica set instance that consists of three nodes

Sharded cluster instance

Replica set instance that consists of six nodes

Business structure data

Historical performance data

Database configuration data

Business data

Virtual private cloud (VPC)

Secure Sockets Layer (SSL) encryption

Transparent Data Encryption (TDE)

SOL audit

When you purchase a PolarDB cluster, you don ' t need to specify the storage capacity you want to purchase

PolarDB supports both OLTP and OLAP scenarios very well

The PolarDB database engine won ' t require you to replicate data when adding read-only nodes

ApsaraDB for PolarDB uses the pay-as-you-go billing method, therefore you only need to pay for the storage resources you actually use

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.

DataWorks is not supported for MongoDB data processing.

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.

ApsaraDB for MyBase supports resource over commitment.

Instances can be migrated. You can manually migrate instances to idle hosts.

Isolated hosts are used. A host runs only your instances and does not run instances of other users.

ApsaraDB for MyBase allows you to distribute different types of instances at a time.

DTS can migrate data in a circular way, for example, A > B > C > A.

DTS can migrate data from one source database to one destination database, for example, A > B.

DTS can migrate data from one source database to several destination databases, for example, A > B and A > C.

DTS can migrate data from several source databases to one destination database, for example, A > C and B > C.

MySQL

Oracle

OTS

MongoDB

AnolyticDB

HOLO

OSS

Makes it easy to do business anywhere.

Makes data secure and independently managed.

Makes large amounts of data easier to process.

Makes data accessible online and in real time.

Ganos

Pase

Slot failover

High concurrency optimization

Point-in-time restore

Extended data structure modules

Multithreading

Global Replica

Data flashback

Use DTS (Data Transmission Service)

Make a full physical backup of their database and copy it into OSS

This type of migration isn ' t possible

Migrate the entire VM hosting the database

PolarDB MySQL

PolarDB PosgreSQL

PolarDB Oracle

PolarDB Box

DMS

DBS

DTS

DAS

DG

Level-2 backup + Redo log

Level 1 backup + Redo log

Level-2 backup

Level-1 backup

PolarDB for Mysql

PolarDB for Postgres

PolarDB for SQLserver

PolarDB for Oracle

Integrates data across multiple data sources

Backs up multiple types of databases

Evaluates the database migration project

Enables online database management, such as data query, database and table management, and permission management

MySQL

SQL Server

PostreSQL

DB2

Full backup and incremental backup

Full backup only

Logical migration tools

Incremental backup only