On Sat, Nov 7, 2015 at 3:54 PM, Michael Paquier wrote: > I thought about something like that at some point by saving a minimum > activity pointer in XLogCtl, updated each time a segment was forcibly > switched or after inserting a checkpoint record. Then the bgwriter > looked at if the current insert position matched this minimum activity > pointer, skipping LogStandbySnapshot if both positions match. Does > this match your line of thoughts?
Looking at the code, it occurred to me that the LSN position saved for a XLOG_SWITCH record is the last position of current segment, so we would still need to check if the current insert LSN matches the beginning of a new segment and if the last segment was forcibly switched by saving RecPtr of RequestXLogSwitch in XLogCtl for example. Thoughts? -- Michael -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers