Belle Wong is a freelance author specializing in smaller business, personal finance, banking, and tech/SAAS. She spends her spare moments screening out the latest productivity apps and plotting her latest novel. Link with Belle on LinkedIn or Twitter. Information virtualization permits data to generally be retrieved from several sources https://bookmarkedblog.com/story17640893/the-smart-trick-of-mysql-performance-tuning-that-no-one-is-discussing