FISCO BCOS inherits Ethereum storage while importing distributed storage with high extendability, TPS, adaptability and performance. The storge model contains 2 parts:
Global state: can further be divided into MPTState and StorageState
MPTState: store account status by MPT tree, same with Ethereum
StorageState: store account status by table structure of distributed storage, no historical records stored nor dependency on MPT tree, higher performance
Distributed storage (Advanced Mass Database, AMDB): realize consistency of SQL and NOSQL through abstract table structure, support all kinds of data bases by realizing the storage drive, currently support LevelDB and MySQL.