{
  "slug": "page-lsn",
  "term": "Page LSN",
  "aliases": [
    "pageLSN",
    "page_LSN"
  ],
  "definition": "A page LSN records the log sequence number of the latest logged change reflected in a database page under the engine's recovery protocol.",
  "note": "In original ARIES, redo uses the page LSN, after dirty-page-table and recovery-LSN filtering, to avoid reapplying an update already present on the page. The page state and its LSN must agree; the number alone does not detect torn or corrupt pages. Undo does not reuse that redo test: history has first been repeated, and compensation records track rollback progress. [aries] A page LSN is not the global durable-log flush position or a timestamp, and this description must not be generalized to every engine. [aries-beyond]",
  "related": [
    "log-sequence-number",
    "write-ahead-log",
    "compensation-log-record",
    "torn-write",
    "fuzzy-checkpoint"
  ],
  "status": "shipping",
  "advantages": [],
  "limitations": [],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "citations": [
    {
      "id": "aries",
      "title": "Mohan, Haderle, Lindsay, Pirahesh and Schwarz. ARIES. ACM TODS 17(1), 1992, sections 3, 5.2 and 6.2-6.3.",
      "url": "https://www.cs.cmu.edu/~15849g/readings/mohan92.pdf",
      "accessed": "2026-10-15"
    },
    {
      "id": "aries-beyond",
      "title": "C. Mohan. Repeating History Beyond ARIES. VLDB 1999, sections 3.2.1-3.2.2.",
      "url": "https://www.vldb.org/conf/1999/P1.pdf",
      "accessed": "2026-10-15"
    },
    {
      "id": "hesela-wal",
      "title": "Hesela: ARIES rollback progress, with a synthetic executable trace",
      "url": "https://hesela.com/analyses/wal-checkpoints-torn-pages/#aries-rollback",
      "accessed": "2026-10-15"
    }
  ],
  "updated": "2026-10-15"
}