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Database / ScyllaDB Interview questions

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.

What language is ScyllaDB implemented in?
Which DynamoDB-compatible API does ScyllaDB provide?

More Related questions...

What is ScyllaDB? What are the key features of ScyllaDB? What is the shard-per-core architecture in ScyllaDB? Define a partition key in ScyllaDB? What is a clustering key in ScyllaDB? What are the data types supported by ScyllaDB? Describe the Seastar framework used by ScyllaDB? What are the types of consistency levels in ScyllaDB? List the compaction strategies available in ScyllaDB? How do you create a table in ScyllaDB? What is a materialized view in ScyllaDB? Explain the purpose of the commit log in ScyllaDB? What is ScyllaDB Alternator? How do you apply TTL to data in ScyllaDB? What is ScyllaDB Manager? Why doesn't ScyllaDB rely on a JVM? How does ScyllaDB achieve linear scalability per node? What is the difference between ScyllaDB and Apache Cassandra? When should you use a local secondary index versus a global one? What happens when a wide partition forms in ScyllaDB? How is data replicated across nodes in ScyllaDB? Why should you avoid large batch statements in ScyllaDB? What is the difference between ScyllaDB and DynamoDB? How does ScyllaDB handle node failure with hinted handoff? When would you choose LOCAL_QUORUM over QUORUM? How can you optimize write performance in ScyllaDB? What is the difference between memtables and SSTables? Why do we use tombstones in ScyllaDB? How does ScyllaDB's shard-aware driver route requests? What is the difference between STCS and LCS compaction? When should you use lightweight transactions in ScyllaDB? How is repair implemented in ScyllaDB? Why doesn't ScyllaDB support arbitrary ad-hoc joins? What is the difference between ScyllaDB tablets and vnodes? How do you troubleshoot high read latency in ScyllaDB? Explain the internal working of the Seastar future-promise model? Explain the execution flow of a write request in ScyllaDB? Explain the lifecycle of an SSTable in ScyllaDB? How does ScyllaDB guarantee strongly consistent schema changes using Raft? What happens internally when ScyllaDB performs compaction? How can you optimize a multi-datacenter ScyllaDB deployment for latency? Which is better and why: LOCAL_QUORUM or ONE for a globally distributed app? How does token-aware routing improve latency in ScyllaDB? Why is the gossip protocol critical to ScyllaDB's cluster membership? How do you troubleshoot compaction backlog in ScyllaDB? Explain the internal working of ScyllaDB's read path? What happens when a node becomes unavailable in a ScyllaDB cluster? How does ScyllaDB implement Change Data Capture internally? Explain the execution flow of a lightweight transaction in ScyllaDB? How can you optimize schema design to avoid wide partitions at scale?
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