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TrailDB vs VelocityDB: What are the differences?
What is TrailDB? An efficient tool for storing and querying series of events, by AdRoll. TrailDB's secret sauce is data compression. It leverages predictability of time-based data to compress your data to a fraction of its original size. In contrast to traditional compression, you can query the encoded data directly, decompressing only the parts you need.
What is VelocityDB? A NoSQL Object Database, extended as Graph Database is VelocityGraph. It is a C# .NET NoSQL Object Database that can be Embedded/Distributed, extended as Graph Database is VelocityGraph. It supports both embedded and distributed deployments.
TrailDB and VelocityDB can be categorized as "Databases" tools.
TrailDB is an open source tool with 965 GitHub stars and 63 GitHub forks. Here's a link to TrailDB's open source repository on GitHub.