Fabric 1.0源代码笔记之 LevelDB（KV数据库） 1、LevelDB概述 LevelDB是Google开源的持久化KV单机数据库，具有很高的随机写，顺序读/写性能，但是随机读的性能很一般，也就是说，LevelDB很适合应用在查询较少，而写很多的场景。 LevelDB的特点： key和value都是任意长度的字节数组； entry（即一条K-V记录）默认是按照key的字典顺序存储.....

文章 2018-11-01 来自：开发者社区

区块链教程Fabric1.0源代码分析Ledger statedb（状态数据库）-兄弟连区块链

Fabric 1.0源代码笔记之 Ledger #statedb（状态数据库） 1、statedb概述 statedb，或VersionedDB，即状态数据库，存储了交易（transaction）日志中所有键的最新值，也称世界状态（world state）。可选择基于leveldb或cauchdb实现。 statedb，代码分布在core/ledger/kvledger/txmgmt/stat....

文章 2018-11-01 来自：开发者社区

区块链教程Fabric1.0源代码分析ledgerID数据库-兄弟连区块链教程

1、idStore概述 Fabric支持创建多个Ledger，不同Ledger以ledgerID区分。多个ledgerID及其创世区块存储在idStore数据库中，idStore数据库基于leveldb实现。 idStore默认使用路径：/var/hyperledger/production/ledgersData/ledgerProvider/。 idStore库中特殊key "under.....

文章 2018-11-01 来自：开发者社区

区块链教程Fabric1.0源代码分析Ledger historydb历史数据库

1、historydb概述 historydb，用于存储所有块读写集中写集的内容。代码分布在core/ledger/kvledger/history/historydb目录下，目录结构如下： historydb.go，定义核心接口HistoryDBProvider和HistoryDB。 histmgr_helper.go，historydb工具函数。 historyleveldb目录，hist.....

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