Value: Easier to use and lower cost. It delivers elastic resources more flexibly with Serverless, automatically and quickly add Serverless elastic resources to the instance when the current setup is overload, improving instance throughput performance in a flash to withstand the challenges of bursty traffic on system stability without the need to configure auto-scaling for real-time elasticity.
Value: It provides features like readable standby node and MGR. It's more cost-saving for 'heavy read but few write' business scenario.
Document: https://www.alibabacloud.com/help/apsaradb-for-rds/latest/using-group-replication
Value: It provides better flexibility and more cost-effective.
Value: It requires zero application re-configuration during cloud migration when the default port of MongoDB is not used in the production environment.

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Alibaba Cloud PolarDB for PostgreSQL is an in-house relational database service 100% compatible with PostgreSQL and highly compatible with the Oracle syntax.
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PolarDB for MySQL
Alibaba Cloud PolarDB for MySQL is a cloud-native relational database service 100% compatible with MySQL.
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An on-demand database hosting service for PostgreSQL with automated monitoring, backup and disaster recovery capabilities
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