maria-discuss team mailing list archive

[kentoku <kentokushiba@xxxxxxxxx>]

Hi Roberto,

Thank you for testing VP.
I'll think about this feature.

Thanks,
Kentoku


2014-09-21 18:10 GMT+09:00 Roberto Spadim <roberto@xxxxxxxxxxxxx>:
> Hi! Well i'm checking vp isn't part of mariadb today :/ maybe we should port
> it first and after jmplement new features, right?
>
> Em domingo, 21 de setembro de 2014, Oleksandr Byelkin
> <sanja@xxxxxxxxxxxxxxxx> escreveu:
>
>> Hi!
>>
>> On 21.09.14 05:06, Roberto Spadim wrote:
>> [skip]
>>>
>>>
>>> sounds crazy? :)
>>> ok i know that query cache have some problems with mutex, but it's
>>> another history we could have a better hit rate with this feature (at least
>>> when correctly used)
>>> check that query cache become inconsistent if we change data1 or data2
>>> outside vp table
>>>
>>>
>>
>> It is doable if put a lot of hooks of asking engine about tables.
>>
>> There is already hooks now used in table invalidation. But it works slowly
>> (relatively) because having no open table difficult to give engine full
>> information and so each such hook will cause semi-open process and so if we
>> have miss it looks like double opening overhead.
>>
>> So, in price of total overhead we can make it, the question is if it help
>> so much that gain will be more then overhead in average... As usual I have
>> doubts about it (need a proof).
>>
>> [skip]
>
>
>
> --
> Roberto Spadim
> SPAEmpresarial
> Eng. Automação e Controle
>