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(parent: f6438f6) | patch
Avoid marking buffer dirty when VACUUM has no work to do.
authorSimon Riggs <simon@2ndQuadrant.com>
Fri, 18 Nov 2011 16:06:53 +0000 (16:06 +0000)
committerSimon Riggs <simon@2ndQuadrant.com>
Fri, 18 Nov 2011 16:06:53 +0000 (16:06 +0000)
commitc1458cc495ff800cd176a1c2e56d8b62680d9b71
treeb13653180e37885d81bfbdd838318506d742caf9tree
parentf6438f66226e37851e11a93edebae0198a875100commit | diff
Avoid marking buffer dirty when VACUUM has no work to do.
When wal_level = 'hot_standby' we touched the last page of the
relation during a VACUUM, even if nothing else had happened.
That would alter the LSN of the last block and set the mtime
of the relation file unnecessarily. Noted by Thom Brown.
src/backend/access/nbtree/nbtpage.c diff | blob | blame | history
Kevin Grittner's development, especially fully serializable transactions (See http://wiki.postgresql.org/wiki/Serializable for more info)