Suggested Answer:
Azure Cosmos DB is an example of a platform as a service (PaaS) cloud database provider. Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/database-security
First line says "Azure Cosmos DB is a fully managed platform-as-a-service (PaaS)"
https://docs.microsoft.com/en-us/azure/cosmos-db/account-databases-containers-items
Types of Azure Database Services:
PaaS (Platform as a Service):
Fully managed, no need to handle updates or maintenance.
Examples:
Azure SQL Database
Cosmos DB
Azure Database for MySQL, PostgreSQL, MariaDB.
Best For: When you want simplicity and focus on application development.
IaaS (Infrastructure as a Service):
You manage the database and server (on a Virtual Machine).
Examples:
Running SQL Server or Oracle on Azure VMs.
Best For: Custom configurations or when migrating existing databases.
Summary:
Most Azure databases are PaaS because they are easier to manage, but Azure also offers IaaS for full control. Choose based on your needs.
O Azure Cosmos DB é um serviço de banco de dados distribuído globalmente,que não exige do usuário gerenciamento infraestrutura.O usuário apenas consome o serviço
Cria bancos, coleções, faz queries, configura replicação, etc. Isso o classifica como PaaS (Platform as a Service), pois: Ele oferece plataforma para desenvolvimento
e operação de aplicações, incluindo banco de dados escalável. Não é SaaS, pois não é um software pronto de uso final como o Outlook ou o Microsoft 365. Não é IaaS,
pois não exige controle de VMs, storage ou rede. Apesar de usar um modelo serverless, "serverless" não é uma categoria formal de entrega (como IaaS, PaaS, SaaS)
e sim uma característica técnica que pode estar presente dentro de PaaS (como o Cosmos DB serverless mode).
Looks like the answer has changed (as of October 2022) - the docs currently say it's "severless".
https://docs.microsoft.com/en-us/azure/cosmos-db/introduction
"Develop high-performance applications of any size or scale with a fully managed and serverless distributed database supporting open-source PostgreSQL, MongoDB, and Apache Cassandra."
Microsoft has contradicting documentation on Cosmos Db
Link 1: "Azure Cosmos DB is a fully managed, serverless NoSQL database ..."
Link 2: "Azure Cosmos DB is a fully managed platform-as-a-service (PaaS)."
Link 3: It does not say anything clear whether it is a PaaS or serverless, but uses 'serverless' few times.
https://azure.microsoft.com/en-us/services/cosmos-db/#overview
https://docs.microsoft.com/en-us/azure/cosmos-db/account-databases-containers-items
https://docs.microsoft.com/en-us/azure/cosmos-db/introduction
I would like to go with PaaS as Cosmos Db uses container instances underneath and uses other PaaS services like serverless computing, Azure functions etc. It is a database offering to customize it as per your needs, which is possible in PaaS.
COSMO DB is serverless.
https://azure.microsoft.com/en-us/services/cosmos-db/
"Azure Cosmos DB is a fully managed, serverless NoSQL database for high-performance applications of any size or scale. "
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