KV 数据库
KV 存储引擎知识体系 —— 按存储模型分类整理 RocksDB / LevelDB / Pebble / Badger / LMDB / redb / bbolt，以及 Bitcask 模型（rosedb / basho/bitcask）的机制 与选型。
存储模型分类
| 模型 | 代表引擎 | 核心思路 |
| LSM-Tree | RocksDB / LevelDB / Pebble / Badger | 顺序写 + 分层 compaction，写密集首选；key 索引不必全放内存 |
| B+Tree | LMDB / redb / bbolt | 原地更新 + mmap，读密集 / 低内存 |
| Bitcask（日志 + 内存索引） | rosedb / basho/bitcask | append-only 日志 + 全部 key 的 keydir 常驻内存，读最多一次 seek，靠 merge 回收空间 |
Docs
| Docs | Description |
| KV 数据库对比 | KV 引擎全面对比（语言、存储结构、性能、生态） |
| Bitcask 存储模型 | 日志结构哈希表：数据结构（entry / keydir / hint file / merge）、读写路径、优劣与实现列表 |
Backlinks (1)
flowchart LR
n0["Collection"]
n1["Maps"]
n2["Database"]
n3["Bitcask 存储模型（日志结构哈希表）"]
n4["KV 数据库对比"]
n5["KV 数据库"]
n6["PostgreSQL 活跃会话诊断（Active Sessions）"]
n7["PostgreSQL 磁盘占用查看（Table Size / Datafile）"]
n8["PostgreSQL"]
n9["PostgreSQL 内存占用查看（Memory / Buffers / Connections）"]
n10["PostgreSQL 查看慢查询（Slow Query）"]
n11["PostgreSQL WAL 与 LSN"]
n12["Knowledge"]
n13["Cloud"]
n14["对象存储基本用法（Bucket / Object / 常用操作）"]
n15["对象存储数据迁移（R2 → MinIO / 跨厂商搬迁）"]
n16["Object Storage"]
n17["挂载 Bucket 为本地文件系统（FUSE Mount）"]
n18["对象存储签名 URL（Signed URL）原理与实战"]
n19["对象存储供应商对比（S3 / R2 / OSS / Supabase / MinIO）"]
n20["Infrastructure"]
n21["Prototypes"]
n22["Research"]
n23["Better Auth 源码阅读指南"]
n24["DuckDB 实战研究"]
n25["英语学习 Dashboard"]
n26["Jellyfin 源码阅读指南"]
n27["Lux 资料整理"]
n28["Nest Commander 学习资料"]
n29["NestJS 源码阅读指南"]
n30["Protomaps 自建底图研究"]
n31["自制 PMTiles 地图（最简单例子）"]
n32["MapLibre 集成 Protomaps"]
n33["PMTiles 格式与工具链"]
n34["上海地区底图项目"]
n35["Redash 源码阅读指南"]
n36["Rust 学习计划"]
n37["shadcn/ui 实用研究（从环境到基本使用）"]
n38["TRIP 项目核心原理与代码阅读指南"]
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click n0 "../../../collection/" "Collection"
click n1 "../../../collection/maps/" "Maps"
click n2 "../" "Database"
click n3 "bitcask/" "Bitcask 存储模型（日志结构哈希表）"
click n4 "comparison/" "KV 数据库对比"
click n5 "./" "KV 数据库"
click n6 "../postgresql/active-sessions/" "PostgreSQL 活跃会话诊断（Active Sessions）"
click n7 "../postgresql/disk-usage/" "PostgreSQL 磁盘占用查看（Table Size / Datafile）"
click n8 "../postgresql/" "PostgreSQL"
click n9 "../postgresql/memory-usage/" "PostgreSQL 内存占用查看（Memory / Buffers / Connections）"
click n10 "../postgresql/slow-queries/" "PostgreSQL 查看慢查询（Slow Query）"
click n11 "../postgresql/wal-lsn/" "PostgreSQL WAL 与 LSN"
click n12 "../../" "Knowledge"
click n13 "../../infrastructure/cloud/" "Cloud"
click n14 "../../infrastructure/cloud/object-storage/basic-usage/" "对象存储基本用法（Bucket / Object / 常用操作）"
click n15 "../../infrastructure/cloud/object-storage/data-migration/" "对象存储数据迁移（R2 → MinIO / 跨厂商搬迁）"
click n16 "../../infrastructure/cloud/object-storage/" "Object Storage"
click n17 "../../infrastructure/cloud/object-storage/mount-bucket/" "挂载 Bucket 为本地文件系统（FUSE Mount）"
click n18 "../../infrastructure/cloud/object-storage/signed-url/" "对象存储签名 URL（Signed URL）原理与实战"
click n19 "../../infrastructure/cloud/object-storage/vendors-comparison/" "对象存储供应商对比（S3 / R2 / OSS / Supabase / MinIO）"
click n20 "../../infrastructure/" "Infrastructure"
click n21 "../../../prototypes/" "Prototypes"
click n22 "../../../research/" "Research"
click n23 "../../../research/topics/better-auth/" "Better Auth 源码阅读指南"
click n24 "../../../research/topics/duckdb/" "DuckDB 实战研究"
click n25 "../../../research/topics/english/" "英语学习 Dashboard"
click n26 "../../../research/topics/jellyfin/" "Jellyfin 源码阅读指南"
click n27 "../../../research/topics/lux/" "Lux 资料整理"
click n28 "../../../research/topics/nest-commander/" "Nest Commander 学习资料"
click n29 "../../../research/topics/nestjs/" "NestJS 源码阅读指南"
click n30 "../../../research/topics/protomaps/" "Protomaps 自建底图研究"
click n31 "../../../research/topics/protomaps/make-own-map/" "自制 PMTiles 地图（最简单例子）"
click n32 "../../../research/topics/protomaps/maplibre/" "MapLibre 集成 Protomaps"
click n33 "../../../research/topics/protomaps/pmtiles/" "PMTiles 格式与工具链"
click n34 "../../../research/topics/protomaps/shanghai-map/" "上海地区底图项目"
click n35 "../../../research/topics/redash/" "Redash 源码阅读指南"
click n36 "../../../research/topics/rust/" "Rust 学习计划"
click n37 "../../../research/topics/shadcn-ui/" "shadcn/ui 实用研究（从环境到基本使用）"
click n38 "../../../research/topics/trip/" "TRIP 项目核心原理与代码阅读指南"
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