Re: WIP: Fast GiST index build

On Wed, Jul 13, 2011 at 12:40 PM, Alexander Korotkov
<aekorotkov(at)gmail(dot)com>wrote:

> On Wed, Jul 13, 2011 at 12:33 PM, Heikki Linnakangas <
> heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>
>> Is it possible to switch to the new buffering method in the middle of an
>> index build? We could use the plain insertion method until the index grows
>> to a certain size (effective_cache_size?), and switch to the buffering
>> method after that.
>
> Yes, it seems to be possible.
>
It also gives possibility to get estimate of varlena size by real data
before start of buffering method using.

> It also would be great to somehow detect case of ordered data when regular
> index build performs well.
>
I think this case can be detected by the situation when most part of index
tuples are inserting into few leaf pages which was recently used.

------
With best regards,
Alexander Korotkov.