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VoltDB

In-memory relational DBMS capable of supporting millions of database operations per second

23 Alternatives To VoltDB

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Aerospike

Aerospike is a high-performing NoSQL database supporting high transaction volumes with low latency.
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Apache Ignite

high-performance, integrated and distributed in-memory platform for computing and transacting on…

Azure Cosmos DB

NoSQL JSON database for rapid, iterative app development.
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BuntDB

A fast, embeddable, in-memory key/value database for Go with custom indexing and geospatial support

CQEngine

Ultra-fast SQL-like queries on Java collections. Contribute to npgall/cqengine development by creating an account on GitHub.
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PostgreSQL

PostgreSQL is a powerful, open source object-relational database system.
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Redis

Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
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SAP HANA

SAP HANA is an in-memory, column-oriented, relational database management system.