What is ScyllaDB?

ScyllaDB is a distributed, wide-column NoSQL database built in C++ as a drop-in replacement for Apache Cassandra, designed to squeeze far more throughput out of the same hardware. It re-implements Cassandra's data model and wire protocol from scratch on top of the Seastar framework, avoiding the JVM entirely.

Because it's written in C++ with a shard-per-core architecture, ScyllaDB sidesteps garbage collection pauses and can drive a single machine's CPU cores far closer to their limit than a JVM-based database can. It supports the CQL query language, is wire-compatible with existing Cassandra drivers, and also ships Alternator, a DynamoDB-compatible API, so teams can migrate from either Cassandra or DynamoDB without rewriting application code. It's commonly used for workloads needing high write throughput and low tail latency at scale, such as IoT ingestion, ad tech, and real-time analytics.

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