[xwiki-users] managing very large amount of data

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. 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? Also, I'd also like to know what kinds of considerations are needed to build a large XWiki system. Which database is recommended? MySQL is ok? Is it a good idea to manually apply MySQL's partitioned table feature to large tables? And others... Any suggestion would be greatly appreciated. Thanks in advance, ebi