Redis

• redis/redisGitHubredis/redisredis/redis · RSALv2, SSPLv1, C · 7.2 BSD-3 -> RSALv2, SSPLv1 · BSD fork · valkey · https://codeberg.org/redict/redict · 支持的数据类型: string, bitmap, hll, list, pub/sub, hash, set,...笔记：Redis
  • RSALv2, SSPLv1, C
  • 7.2 BSD-3 -> RSALv2, SSPLv1
  • BSD fork
    • valkey笔记valkeyBSD-3, C · placeholderkv -> valkey · Redis 7.2 BSD fork · valkey-io/valkey-glide · Apache-2.0, Rust, Java, Python, Go, TypeScript打开：/notes/db/kv/valkey
    • codeberg.org/redict/redict
• 支持的数据类型: string, bitmap, hll, list, pub/sub, hash, set, sorted set, stream
• Redis Stack 扩展: bloom, cuckoo, count-min, graph, json, suggest, search, t-digest, timeserial, top-k
• 参考
  • 5 Key Takeaways for Developing with RedisLinkredislabs.com/blog/5-key-takeaways-for-developing-with-redisredis/redis · RSALv2, SSPLv1, C · 7.2 BSD-3 -> RSALv2, SSPLv1 · BSD fork · valkey · https://codeberg.org/redict/redict · 支持的数据类型: string, bitmap, hll, list, pub/sub, hash, set,...笔记：Redis
    1. Keep Track of Your Keys
    2. Keep Track of the Length of Your Key Names
    3. Use the Right Data Structures
    4. Use SCAN, Never Use KEYS
    5. Use Server-Side Lua Scripts
  • Redis configuration for productionLinkscaleyourcode.com/blog/article/15redis/redis · RSALv2, SSPLv1, C · 7.2 BSD-3 -> RSALv2, SSPLv1 · BSD fork · valkey · https://codeberg.org/redict/redict · 支持的数据类型: string, bitmap, hll, list, pub/sub, hash, set,...笔记：Redis
    • YouTube
• RedisGraphGitHubRedisLabsModules/redis-graph
  • A graph database as a Redis module

# 使用配置文件启动
wget http://download.redis.io/redis-stable/redis.conf
redis-server redis.conf
# macOS 安装
brew install redis
# 通过 docker 启动
# 数据存储于 ~/data/redis
docker run --rm -it -v $PWD/data:/data -p 6379:6379 --name redis redis redis-server --appendonly ye

redis-server --bind=0.0.0.0

commands

# 获取 key 数量 - 可能失效的也包含
dbsize
# 获取 key 信息
info keyspace

# 扫描 key - SCAN,SSCAN,HSCAN,ZSCAN
# SCAN cursor [MATCH pattern] [COUNT count] [TYPE type]
scan 0

# NX -> Not Exists - 不存在则设置
# XX -> Exists - 存在则设置
# GET -> 返回旧值
# EX -> Expires Seconds - 过期时间 单位秒
# PX -> Expires Milliseconds - 过期时间 单位毫秒
# EXAT -> Expires At - 过期时间 时间戳秒
# PXAT -> Expires At - 过期时间 时间戳毫秒
# KEEPTTL -> 保持原有 TTL
SET key value [NX | XX] [GET] [EX seconds | PX milliseconds | EXAT unix-time-seconds | PXAT unix-time-milliseconds | KEEPTTL]

• 2.6.12+ 支持 EX, PX, NX, XX
• 6.0.0+ 支持 KEEPTTL
• 6.2.0+ 支持 GET, EXAT, PXAT
• 7.0.0+ 支持 NX, GET 同时使用

Stream

• redis api
• 参考
  • Redis Streams: consumer groups v2 specification document
  • An update on Redis Streams development

命令

• L - List
• H - Hash
• Z - SortedSet
• S - Set
• X - Stream
• Channel - SUBSCRIBE,PUBLISH,UNSUBSCRIBE
  • P - Pattern - PSUBSCRIBE,PUNSUBSCRIBE
  • S - Shared - 集群 channel

Module

• 写 Redis 模块的教程
• Redis 模块仓库
• Antirez 关于 Redis 模块的博客
• wenerme/go-rmGitHubwenerme/go-rm
  • 使用 Golang 写 Redis 模块

键变化通知

• 配置 notify-keyspace-events
  • 默认为 空 - 无事件产生
  • 可配置为 KEA 产生大多数事件
• __keyspace@<db>__:<key> event
  • key 变化
  • key -> event
• __keyevent@<db>__:<key> event
  • 事件
  • event -> key

| flag | | ---- | ----------------------------------- | | K | __keyspace@<db>__ 前缀 | | E | __keyevent@<db>__ 前缀 | | g | 通用命令 - DEL, EXPIRE, RENAME, ... | | $| string | | l | list | | s | set | | h | hash | | z | Sorted set | | t | stream | | d | module key type | | x | expired events | | e | evicted events | | m | key miss events - 访问不存在的 KEY | | n | new key events - A 不包含 | | A | `g$lshztxed` - 除了 mn 的所有事件 |

• Ex - 只监听 key 过期
• AKE - 监听所有事件
• Kx - 键空间过期通知

• {l,r}{pop,push}
  • RPOPLPUSH, BRPOPLPUSH
  • LMOVE, BLMOVE
• expired
• evicted
• new

# 所有事件
redis-cli --csv psubscribe '__key*__:*'

redis-benchmark

redis-benchmark -q -n 100000
redis-benchmark -q -n 100000 -t set,get -P 16

• redis.io/docs/reference/optimization/benchmarks

Inside