with tens of thousands of participants and about 1000 concurrent voting systems, which configuration should be selected for the CVM for storage with mysql,? What about the bandwidth? More than big data should be used for mysql or mariadb (because there is oss), bandwidth in the image, what is the appropriate size of redis? Similar to this kind of voting system, what else does redis need to save besides session? If payment is included, does redis need to cache payment information? Should I write mysql or redis first? Ask for advice!