CouchDB vs. LevelDB: Comparing state database options

Hyperledger Fabric is an open-source, permissioned blockchain framework designed for enterprise use, featuring a modular architecture capable of handling over 1,000 transactions per second, with potential upgrades to 20,000 TPS. It's part of the Linux Foundation's Hyperledger project and is supported by a vast network of contributors. Hyperledger Fabric differs from other blockchain technologies with its permissioned architecture, open smart contract model, and multilanguage support, making it suitable for industries like banking, finance, and IoT. The framework uses chain codes (smart contracts) written in languages like Go, Node.js, and Java to interact within the network. It supports two main types of databases for storing the world state: LevelDB, a simple key-value store without SQL capabilities, and CouchDB, a document-oriented database offering JSON format support and rich queries. LevelDB is preferred for simpler projects due to its speed and ease of use, while CouchDB is better for complex projects requiring features like indices and JSON storage. The choice of database is crucial, as it cannot be changed once the network is launched, with CouchDB providing better support for auditing and reporting in high-volume transaction environments.