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Database write amplification

Database byte write amplification is storage-engine output bytes written divided by logical input bytes over a stated interval and accounting boundary.

Specify whether input counts keys, values or both, and whether output includes WAL, compaction and value-store cleaning. This ratio is distinct from host-to-NAND write amplification. [wisckey]

Relations

related

write-amplification, lsm-tree, key-value-separation

Citations

1. Lanyue Lu, Thanumalayan Sankaranarayana Pillai, Andrea C. Arpaci-Dusseau and Remzi H. Arpaci-Dusseau. WiscKey: Separating Keys from Values in SSD-conscious Storage. USENIX FAST 2016, pp. 133-148, sections 3.2-3.3 and 4. (accessed 2026-10-12)
2. Key-value separation: the cleaning bill moves elsewhere (accessed 2026-10-12)

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