Twitter 使用内存数据库，MySQL 仅用于备份。
下图可以解释 Twitter 的架构：
Twitter uses in memory database and MySQL is just for backup.
This is a diagram that might explain Twitter's architecture:
MySQL 并不像前面的答案中提到的那样用于备份，而是用于实际存储数据。
他们开发了自己的数据库 FlockDB，它使用 mySQL 作为后端数据库以及其他一致性、索引等机制。
有关 FlockDB 和源代码的更多信息，请参见：
他们已经优化了 MySQL 数据库架构，使其查询性能非常好。
有关架构的更多信息，请访问：
http://www.slideshare.net/ nkallen/q-con-3770885?from=ss_embed
MySQL is not used for backup as mention in the previous answer but for actually storing the data.
They have developed their own database called FlockDB which uses mySQL as back-end database along with other mechanisms for consistency,indexing etc.
More information about FlockDB and source code here:
https://github.com/twitter/flockdb
But they have optimized their MySQL database schema in a way to perform extremely well with their queries.
More information about the schema here:
http://www.slideshare.net/nkallen/q-con-3770885?from=ss_embed
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Twitter 使用内存数据库，MySQL 仅用于备份。
下图可以解释 Twitter 的架构：
Twitter uses in memory database and MySQL is just for backup.
This is a diagram that might explain Twitter's architecture:
MySQL 并不像前面的答案中提到的那样用于备份，而是用于实际存储数据。
他们开发了自己的数据库 FlockDB，它使用 mySQL 作为后端数据库以及其他一致性、索引等机制。
有关 FlockDB 和源代码的更多信息，请参见：
他们已经优化了 MySQL 数据库架构，使其查询性能非常好。
有关架构的更多信息，请访问：
http://www.slideshare.net/ nkallen/q-con-3770885?from=ss_embed
MySQL is not used for backup as mention in the previous answer but for actually storing the data.
They have developed their own database called FlockDB which uses mySQL as back-end database along with other mechanisms for consistency,indexing etc.
More information about FlockDB and source code here:
https://github.com/twitter/flockdb
But they have optimized their MySQL database schema in a way to perform extremely well with their queries.
More information about the schema here:
http://www.slideshare.net/nkallen/q-con-3770885?from=ss_embed