On Tue, Sep 13, 2022 at 08:17:27AM +1200, David Rowley wrote: > > certain operating systems, PostgreSQL 15 supports the ability to > > [prefetch WAL file > > contents](https://www.postgresql.org/docs/15/runtime-config-wal.html#GUC-RECOVERY-PREFETCH) > > I think "ability to prefetch WAL file contents" is not really an > accurate way to describe this feature. What the prefetcher does is > prefetch the pages of tables, indexes and materialized views which are > referenced by WAL, so that when the recovery process comes along > later, the pages of these relations which are being changed by the WAL > record are more likely to be in memory so that the recovery process is > less likely to have to load the referenced pages from disk. > > Perhaps the text should read: > > "PostgreSQL 15 adds support for prefetching pages referenced in [WAL]."
Related: https://www.postgresql.org/message-id/20220904075450.6g4nm4hralyw3tab@alvherre.pgsql
