Blockchains

MainChain & SQLChain

CQL uses a layered architecture for database creation and operation. A typical data creation process can be roughly as follows:

1. Miner will automatically register with the MainChain after startup. The registration information includes: "Minimum acceptable Gas price", "System metrics", "External IP and port", etc.
2. Miner subscribes to and pays attention to information related to themselves through ChainBus;
3. The client runs cql create -db-node 2 to send a signed database creation request to any BP (Block Producer) in the MainChain;
4. The BP that received the request performs a match of Miner and database creation request in the process of producing the block (see: [MainChain Produce Block] (#mainchain-produce-block));
5. Database creation requests and matching results are verified and confirmed at other BP nodes;
6. The Miner subscription receives the database task;
7. Miners discover and connect with each other through Kayak to form a SQLChain database cluster;
8. All miners are ready to wait for a request;
9. Users can connect to the database and execute SQL through the cql console command.

See the image below to view large picture：

MainChain Produce Block

The complete main chain export process is complicated. Please refer to the numbers in the figure below for understanding. For the big picture, please click here