It is a simple cost-effective solution for managing and scaling multiple databases that having varying and unpredictable usage demands
Two Purchasing Model are supported
- DTU based (Storage fixed compute variable)
- vCore based (Compute, storage, memory, IO all are variable)
Databases in an elastic pool are on:
- A single server
- Share a set number of resources at a set price
ManageMultiple Databases with Elastic Pools - Azure SQL Database | Microsoft Docs