Contents
Are microservices stateless or stateful?
Each microservice can either be stateless or stateful. A system that uses microservices typically has a stateless web and/or mobile application that uses stateless and/or stateful services. Stateless microservices do not maintain any state within the services across calls.
Yes, shared database is an anti-pattern in micro services architecture. If one shared database can serve your system well then you don’t need microservices. You should build a monolith instead. The main reason for using microservices is scale.
What are the components of a database management system?
Below is a list of components within the database and its environment. This is the set of programs used to control and manage the overall database. This includes the DBMS software itself, the Operating System, the network software being used to share the data among users, and the application programs used to access data in the DBMS.
When to use different databases for different applications?
Similar data must be stored together, so if you build different applications, you should use different databases for them. In the above case using common db couldn’t be avoided, but remember that I also kept some tables apart in a separate db, that aren’t part of the common queries.
Is it better to use multiple databases with one schema each, or one?
You cannot replicate one schema only compared to the whole database. In a PostgreSQL context I recommend to use one db with multiple schemas, as you can (e.g.) UNION ALL across schemas, but not across databases.
Which is an example of a distributed database system?
A homogenous distributed database system is a network of two or more Oracle Databases that reside on one or more machines In Figure-1 illustrates a distributed system that connects three databases. An application can simultaneously access or modify the data in several databases in a single distributed environment.