On 2020-Mar-13, Thunder wrote: > Hello hackers： > > > During crash recovery, we compare most of the lsn of xlog record with page > lsn to determine if the record has already been replayed. > The exceptions are full-page and init-page xlog records. > It's restored if the xlog record includes a full-page image of the page. > And it initializes the page if the xlog record include init page information. > > > When we enable checksum for the page and verify page success, can we > compare the page lsn with the lsn of full-page xlog record or init > page xlog record to detemine it has already been replayed?
In order to verify that the checksum passes, you have to read the page first. So what are you optimizing? -- Álvaro Herrera https://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
