WAL Fast-Commit: One fsync, One Transaction
MongrelDB commits a transaction with a single fsync on the WAL, because the WAL is the only part of durable storage that has to be synchronous.
Wal
3 posts filed under wal.
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Jul 2026
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Sub-Millisecond HNSW at the Storage Layer
MongrelDB's HNSW index lives in the same engine as the rows it covers, so vector search shares the same WAL, transaction, and /kit/query path as the rest of your data.
FM-Index Full-Text Search in a Transactional Engine
MongrelDB's full-text search uses an FM-index, not the inverted index you usually see, because the FM-index lives in the same WAL as the rows it covers.