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Apache Cassandra is a distributed open source database management system for very large, structured databases. This open-source database management system is column-oriented and designed for both high scalability as well as reliability. Furthermore, Apache Cassandra is fault-tolerant and has no single point of failure. The data model of Cassandra was designed to support the distribution of data in large clusters. The structure of Apache Cassandra consists of multiple nodes. Each Cassandra server in the cluster is considered as a Cassandra node. A unique token is assigned to each Cassandra node. All tokens are sorted in descending order and form a ring.
The Apache data model, called Cassandra, combines the advantages of column indexes and log-structured updates.
All data is stored redundantly on several nodes which can be hosted on different data centers.
Cassandra also includes powerful caching.
These applications run on Linux CentOS 7.
Minimum requirements: 1&1 Cloud Server XL
Your contract allows you to use as many free apps as you’d like. Each app simply needs its own VM.