Re: Moving 'hot' pages from buffer pool to heap

Sent from my iPad

On 06-Aug-2013, at 1:57, Tom Lane <tgl@sss.pgh.pa.us> wrote:

> Atri Sharma <atri.jiit@gmail.com> writes:
>> Just experimenting though.I was thinking of scenarios where a page is pinned for long period of time.My concern was
thatit would lead to blocking of a buffer pool slot for that entire duration. The idea is to allocate a separate data
structurefor such hot pages in memory,and maintain them there. 
>
> You can't do that; such a copy could easily become stale, leading to wrong
> query answers.  Perhaps more to the point, long-term pins (as opposed to
> locks) aren't that problematic.  What problem do you think you're solving?
>
>

Yeah,long term pins are something I was thinking of solving with this.Now that you mention it, I think my main concern
wasn'tlong term pins,rather,anything that doesn't allow for page eviction for a long time. 

Regards,

Atri