Guillaume, Ludovic,

Thank you for your quick responses and kind advices.

What I'm planning is a bibliographical database system.
Briefly speaking, the database will finally have 15,000,000+
bibliographical records and 2,000,000+ author records. Both of them
have small number of fields (at most 10?) and one long text field that
users can freely edit.
Since they have N:N relations each other, based on relational model
design, the table to store the relations can also become large.

Currently, my first option is XWiki and another one is to develop
everything from scratch. But I don't like the latter one...
Actually, the amount of data may not be very important because the
estimated number of concurrent users is quite small.

> You absolutely need to implement custom mapping from your structures.
> Otherwise it will be too big.

Great! It looks like the very feature I should use!

Anyway, I still think XWiki is worth studying further more and I'll
start prototyping.

Thanks,

ebi

2009/10/14 Ludovic Dubost <ludo...@xwiki.org>:
>
> Hi Yuichiro
>
> EBIHARA, Yuichiro a écrit :
>> Hi experts,
>>
>> I'm now planning a system that will store 15,000,000+ items of
>> structured data and provide a basic CRUD functionality for them.
>>
> Nice this sounds like an ambitious project...
>
> Are you talking about 15000000 pages ? Each page would have how many
> additional meta data fields ?
>> While XWiki is the first condidate for me for the time being, I'm
>> worried about if XWiki can manage such a large amount of data.
>>
>> Can anyone say the largest XWiki systems?
>>
>>
> Our largest system is currently Curriki.org.. It's more in the 100K of
> pages but with large pages (they have many XWiki objects).
> There is also a big volume 20GB. We have many installations running with
> that size (mostly because of attachments).
>
>> Also, I'd also like to know what kinds of considerations are needed to
>> build a large XWiki system.
>>
> You absolutely need to implement custom mapping from your structures.
> Otherwise it will be too big.
>
>> Which database is recommended? MySQL is ok? Is it a good idea to
>>
> This is a good question. I'm not a mysql specialist and 15 million rows
> is a lot.
> Postgres might be a good candidate too for that volume.
> You should search on the Internet.
>
> Depending on your confidentially needs, maybe an XWiki storage
> implementation over Google App Engine could be a good candidate.
> It also depends on how much time/spending you have for this application.
>
>> manually apply MySQL's partitioned table feature to large tables? And
>>
> Anything that is transparent to the application and that allows good
> scalability is good
>
>> others...
>>
>> Any suggestion would be greatly appreciated.
>>
> There are some things you need to absolutely avoid like showing in one
> page all the data in a space for example or running a search with rights
> on a common term. That will clearly not work. and just calling it once
> could bring down your install. You might want to write a custom rights
> manager to disable rights altogether if it is an option.
>
>
> I would also suggest that if you have some budget for this project you
> look into having some support to do it right. Initial choices could be
> tough to fix with that amount of data.
> (XWiki SAS provides support http://www.xwiki.com or other experimented
> developers on this list might be able to help)
>
> Ludovic
>> Thanks in advance,
>>
>> ebi
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>>
>>
>
>
> --
> Ludovic Dubost
> Blog: http://blog.ludovic.org/
> XWiki: http://www.xwiki.com
> Skype: ldubost GTalk: ldubost
>
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