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A technical blog post from Data Intellect argues that real-time databases (rdbs) should not be the default in kdb+ systems, presenting benchmarks comparing in-memory and on-disk query performance.
GreptimeDB's Mito2 storage engine uses an LSM-tree design with columnar Parquet SSTs, three-level scan pruning, and TWCS compaction. The blog post provides a full walkthrough of its architecture.