{"id":"btree-wal-entry-includes-full-page","text":"Each B-tree WAL entry is `16 + page_size` bytes (12-byte header with seq/page_num/data_len, full page image, 4-byte CRC32), making WAL writes the dominant cost for small key-value updates","truth_value":"IN","source":"entries/2026/05/29/topic-write-amplification-measurement.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"btree-wal-entry-includes-full-page","truth_value":"IN","reason":"premise"}]}}