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FREE · TOPIC 113

Database WAL And Recovery

537 words·Updated 2026-07-18·
#system-design#databases#recovery
Accompanying Lab
Write-Ahead Log
A tiny durable key-value store that writes JSONL WAL records before applying in-memory state, then replays safe records after a crash.
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Primary References & Engineering Sources
  • ·[[wiki/memtable-wal-and-sstable]]
  • ·[[wiki/storage-engine-resource-guide]]
  • ·[[wiki/database-migration-safety]]
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