On Fri, Jan 20, 2012 at 1:37 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Sun, Jan 8, 2012 at 9:25 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
>> I've taken that idea and used it to build a second Clog cache, known
>> as ClogHistory which allows access to the read-only tail of pages in
>> the clog. Once a page has been written to for the last time, it will
>> be accessed via the ClogHistory Slru in preference to the normal Clog
>> Slru. This separates historical accesses by readers from current write
>> access by committers. Historical access doesn't force dirty writes,
>> nor are commits made to wait when historical access occurs.
> This seems to need a rebase.
Still applies and compiles cleanly for me.
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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