On 12/23/11, Robert Haas <robertmh...@gmail.com> wrote: > On Fri, Dec 23, 2011 at 11:14 AM, Kevin Grittner > <kevin.gritt...@wicourts.gov> wrote: >> Thoughts? > > Those are good thoughts. > > Here's another random idea, which might be completely nuts. Maybe we > could consider some kind of summarization of CLOG data, based on the > idea that most transactions commit.
I had a perhaps crazier idea. Aren't CLOG pages older than global xmin effectively read only? Could backends that need these bypass locking and shared memory altogether? > An obvious problem is that, if the abort rate is significantly > different from zero, and especially if the aborts are randomly mixed > in with commits rather than clustered together in small portions of > the XID space, the CLOG rollup data would become useless. On the > other hand, if you're doing 10k tps, you only need to have a window of > a tenth of a second or so where everything commits in order to start > getting some benefit, which doesn't seem like a stretch. Could we get some major OLTP users to post their CLOG for analysis? I wouldn't think there would be much security/propietary issues with CLOG data. Cheers, Jeff -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers