1、LevelDB is optimized for batch write operations.
2、LevelDB优化了批量写*作。
3、LevelDB has some limitations: no support for SQL queries or indexes, supports multi-threaded single process access and is embedded, which is an advantage for some projects and a problem for others.
4、LevelDB也有一些局限：不支持SQL查询和索引，支持多线程单进程访问，并且可以用于嵌入式设备，这将使某些项目收益，但是也会给其他的项目来带麻烦。
