LIquid: A Large-Scale Relational Graph Database
Briefly

Peter Boncz, a renowned database researcher, criticized graph database systems while being essential in networking activities, emphasizing the importance of understanding and utilizing such databases effectively.
LinkedIn built LIquid, a relational graph database handling 2 million QPS, to leverage second-degree network connections, highlighting the significance of graph databases in networking and relationship mapping.
Read at InfoQ
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