From: Simon Riggs [mailto:si...@2ndquadrant.com] Sent: Thursday, August 09, 2012 5:29 PM On 9 August 2012 12:17, Amit Kapila <amit.kap...@huawei.com> wrote:
>> This optimization is to reduce the amount of WAL and definitely adding >> anything extra will have some impact. > Of course. The question is "How much impact?". Each tweak has > progressively less and less gain. This isn't a binary choice. > Squeezing the last ounce of performance at the expense of all other > concerns is not a sensible goal, IMHO, nor do we attempt that > elsewhere. > Given we're making no attempt to remove full page writes, which is > clearly the biggest source of WAL volume currently, micro optimisation > of other factors seems unwarranted at this stage. What I am pointing from WAL reduction is about Update operation performance and full-page writes doesn't have direct correlation with Update operation except for a case of first time update of page after checkpoint. With Regards, Amit Kapila. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
