Обсуждение: pgsql: Don't vacuum all-frozen pages.
Don't vacuum all-frozen pages. Commit a892234f830e832110f63fc0a2afce2fb21d1584 gave us enough infrastructure to avoid vacuuming pages where every tuple on the page is already frozen. So, replace the notion of a scan_all or whole-table vacuum with the less onerous notion of an "aggressive" vacuum, which will pages that are all-visible, but still skip those that are all-frozen. This should greatly reduce the cost of anti-wraparound vacuuming on large clusters where the majority of data is never touched between one cycle and the next, because we'll no longer have to read all of those pages only to find out that we don't need to do anything with them. Patch by me, reviewed by Masahiko Sawada. Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/fd31cd265138019dcccc9b5fe53043670898bc9f Modified Files -------------- doc/src/sgml/config.sgml | 20 ++-- doc/src/sgml/maintenance.sgml | 86 +++++++++------- src/backend/commands/vacuumlazy.c | 209 ++++++++++++++++++++++++-------------- 3 files changed, 196 insertions(+), 119 deletions(-)
On 2016-03-10 21:16:37 +0000, Robert Haas wrote: > Don't vacuum all-frozen pages. Yeha!
On Thu, Mar 10, 2016 at 1:22 PM, Andres Freund <andres@anarazel.de> wrote: > Yeha! Fantastic effort, particularly from Masahiko. Well done. -- Peter Geoghegan
On 2016/03/11 8:19, Peter Geoghegan wrote: > On Thu, Mar 10, 2016 at 1:22 PM, Andres Freund <andres@anarazel.de> wrote: >> Yeha! > > Fantastic effort, particularly from Masahiko. Well done. +1! - Amit
On Fri, Mar 11, 2016 at 2:08 AM, Amit Langote <Langote_Amit_f8@lab.ntt.co.jp> wrote: > On 2016/03/11 8:19, Peter Geoghegan wrote: >> On Thu, Mar 10, 2016 at 1:22 PM, Andres Freund <andres@anarazel.de> wrote: >>> Yeha! >> >> Fantastic effort, particularly from Masahiko. Well done. > > +1! Yuhu. -- Michael