Glossary

Postgres

  • WAL: Postgres uses a Write Ahead Log (WAL) for durability and replication. In Neon we additionally rely on this WAL to separate storage from compute.
  • LSN: Log Sequence Number, a byte offset into a location inside the entire WAL stream.
  • Page: An 8KB chunk of data, which is the smallest unit of storage that postgres uses for storing relations and indexes on disk. In Neon a page is also the smallest unit of data the Pageserver can be queried for. See also