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Apache AGE
Discontinued Graph database optimized for fast analysis and real-time data processing. It is provided as an extension to PostgreSQL. [Moved to: https://github.com/apache/age]
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Memgraph
Open-source graph database, tuned for dynamic analytics environments. Easy to adopt, scale and own.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
What about the AGE extension for Postgres? https://age.apache.org/
Take a look at Memgraph. It's an in memory graph database built with C++. Supports the Cypher query language. As for the scaling and clustering, I think they have some basics covered but not that much. https://memgraph.com
Related posts
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Apache AGE: PostgreSQL Extension Graph Data Processing and Analytics
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Apache AGE: PostgreSQL Extension Graph Data Processing and Analytics for RDBMS
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Apache AGE supporting latest PostgreSQL (ver 16)
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Ask HN: Were Graph Databases a Mirage?
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Enhancing Fraud Detection with Apache AGE: A Graph Database Approach