Cloud Spanner is the first and only relational database service that is both strongly consistent and horizontally scalable. With Cloud Spanner you enjoy all the traditional benefits of a relational database: ACID transactions, relational schemas (and schema changes without downtime), SQL queries, high performance, and high availability. But unlike any other relational database service, Cloud Spanner scales horizontally, to hundreds or thousands of servers, so it can handle the highest of transactional workloads. With automatic scaling, synchronous data replication, and node redundancy, Cloud Spanner delivers up to 99.999% (five 9s) of availability for your mission critical applications. In fact, Google’s internal Spanner service has been handling millions of queries per second from many Google services for years.
IBM Cloudant is a managed NoSQL JSON database service built to ensure that the flow of data between an application and its database remains uninterrupted and highly performant. Developers are then free to build more, grow more and sleep more.
Google Cloud Spanner is ranked 6th in Database as a Service while IBM Cloudant is ranked 11th in Database as a Service. Google Cloud Spanner is rated 0.0, while IBM Cloudant is rated 0.0. On the other hand, Google Cloud Spanner is most compared with Google Cloud SQL, Amazon RDS, Oracle Database as a Service and SQL Azure, whereas IBM Cloudant is most compared with MongoDB Atlas and Amazon RDS.
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