> For the complete documentation index, see [llms.txt](https://til.notdu.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://til.notdu.com/database/intro-to-database-systems/buffer-pool-and-memory-management/better-policies-localization.md).

# Better Policies: Localization

The DBMS chooses which pages to evict on a per txn/query basis. This minimizes the pollution of the buffer pool from each query

-> Keep track of the pages that a query has accessed

Example: Postgres maintains a small ring buffer that is private to the query