On Fri, Jan 20, 2012 at 10:16 AM, Simon Riggs <simon@2ndquadrant.com> wrote:
> On Fri, Jan 20, 2012 at 1:37 PM, Robert Haas <robertmhaas@gmail.com> wrote:
>> On Sun, Jan 8, 2012 at 9:25 AM, Simon Riggs <simon@2ndquadrant.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.
D'oh. You're right. Looks like I accidentally tried to apply this to
the 9.1 sources. Sigh...
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
