"Heikki Linnakangas" <[EMAIL PROTECTED]> writes: > It would be interesting to do something like that to speed up replay of long > PITR archives, though. You could scan all (or at least far ahead) the WAL > records, and make note of where there is full page writes for each page. > Whenever there's a full page write further ahead in the log, you could ignore > all changes to that page before that, because they're going to be overwritten > anyway.
Hm, you could generate that data when you generate the logs. Keep a hash of block number and when the last full page write was. Then whenever you switch log files dump out that hash in a second file alongside. PITR recovery could read that in before it starts reading any file and consult it before applying any records. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Ask me about EnterpriseDB's PostGIS support! ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
