Solutions to questions such as: Assume that you want to sort a file of size N pages. You have A buffer pages available... Is it possible that deleting an entry reduces global depth by 3 in the Extensible Hashing? Consider a relation R (a,b,c,d,e) con

mongodb驱动，可以对mongo数据库进行增删改查，创建和删除数据库和表(Mongodb driver, you can edit the mongo database, create and delete databases and tables)

memory mapped noSQL database engine