Why MySQL is not scalable?

Why SQL database is not scalable?

The main reason relational databases cannot scale horizontally is due to the flexibility of the query syntax. SQL allows you to add all sorts of conditions and filters on your data such that it's impossible for the database system to know which pieces of your data will be fetched until your query is executed.

Is MySQL database scalable?

MySQL Cluster is a scalable, real-time in-memory, ACID-compliant transactional database, combining 99.999% availability with the low TCO of open source.

Does MySQL scale well?

MySQL can scale, but if you don't configure it correctly then it will fail miserably when the tables get too large. PostgreSQL scales better out of the box, but either does fine if configured correctly. It looks like your application is bigger than you are used to, but really isn't "that" big.

Is MySQL horizontal scalable?

MySQL Cluster automatically shards (partitions) tables across nodes, enabling databases to scale horizontally on low cost, commodity hardware to serve read and write-intensive workloads, accessed both from SQL and directly via NoSQL APIs.