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neo4j open source graph database »
Neo4j is a graph database. It is an embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs rather than in tables. A graph (mathematical lingo for a network) is a flexible data structure that allows a more agile and rapid style of development.
Keyspace - Scalien
Keyspace is a consistently replicated, fault-tolerant key-value store.
redis - Google Code
Redis is a key-value database. It is similar to memcached but the dataset is not volatile, and values can be strings, exactly like in memcached, but also lists and sets with atomic operations to push/pop elements.
In order to be very fast but at the same time persistent the whole dataset is taken in memory and from time to time and/or when a number of changes to the dataset are performed it is written asynchronously on disk. You may lost the last few queries that is acceptable in many applications but it is as fast as an in memory DB (beta 6 of Redis includes initial support for master-slave replication in order to solve this problem by redundancy).
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Redis is a key-value database. It is similar to memcached but the dataset is not volatile, and values can be strings, exactly like in memcached, but also lists and sets with atomic operations to push/pop elements.
Scimore
High performance distributed, client/server and fully featured embedded SQL database
ITTIA | Lightweight Relational Embedded Database Software
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ITTIA is the global leader in lightweight embedded database software and consulting services. We assist companies to build embedded systems and mobile and intelligent devices that are faster, more reliable and better at a lower cost. Our next-generation of lightweight database software and embedded experience enable our customers to focus on their business by relying on our technology and expertise to succeed.
scalaris - Google Code
Scalaris is a scalable, transactional, distributed key-value store. It can be used for building scalable Web 2.0 services. Scalaris uses a structured overlay with a non-blocking Paxos commit protocol for transaction processing with strong consistency over replicas. Scalaris is implemented in Erlang.
Stanford Trio Project
Trio is a new kind of database management system: one in which data, uncertainty of the data, and data lineage are all first-class citizens. Trio is based on an extended relational model called ULDBs, and it supports a SQL-based query language called TriQL.
Zebra
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Zebra is a high-performance, general-purpose structured text indexing and retrieval engine. It reads
structured records in a variety of input formats (eg. email, XML, MARC) and allows access to them through
exact boolean search expressions and relevance-ranked free-text queries.
Aster Data
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- Query 10x faster than traditional RDBMS
- Scale from GB to PB in a single click
- Reduce cost 10x via commodity hardware
The most scalable analytic database system:
Aster delivers In-Database MapReduce - uniting MapReduce and SQL in a single RDBMS
StrokeDB
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StrokeDB is an embeddable distributed document database written in
Ruby. It is schema-free, it
scales infinitely, it even tracks revisions and perfectly
integrates with Ruby applications.
Data versioning
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Here's a realtively simple way to implement data versioning in a
database, in a way that should be scalable as well. It only needs a
couple of support tables and a single function and can apply
versioning across multiple data sets concurrently. It also supports
branching and tagging using a natural model.
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