Relational databases have provided a platform of choice for enterprise applications for several
years, providing persistence, concurrency control and robust integration mechanisms. However,
the landscape of enterprise data is currently changing. From xed data structures and schema,
we are moving towards semi-structured or unstructured data and a schema-less approach. From
simple access patterns like a single write and many reads, we are moving towards applications
where there are many writers and many readers of data. Instead of data authoring being central-
ized, the authorship is now universal in nature. ...
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