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Summary of Redis performance monitoring indicators

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Release: 2020-09-27 11:30:57
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Summary of Redis performance monitoring indicators

Monitoring indicators

  • ##Performance indicators: Performance
  • ##
  • Memory indicators: Memory
  • Basic activity indicators: Basic activity
  • Persistence indicator: Persistence
  • Error indicator: Error

Performance indicators: Performance

Memory indicator: Memory

##Name Description ## Cache hit rate (calculated )
#The time it takes for Redis to respond to a request ##
Average total number of requests processed per second # #hi rate(calculated)

Basic activity indicator: Basic activity

# #
Memory used
#mem_fragmentation_ratio Memory fragmentation rate
##evicted_keys The number of keys removed due to maximum memory limit
blocked_clients Clients that are blocked due to BLPOP, BRPOP, or BRPOPLPUSH
## #connected_clients #
#Name Description
Number of client connections #
##The number of seconds since the last master-slave interaction ##keyspace
Total number of key values in the database

Persistence Indicators: Persistence

## #
#NameDescription
The timestamp of the last persistent disk save ##rdb_changes_sice_last_save
The number of changes to the database since the last persistence Error indicator: Error


’ ’ ’ ward ’ ‐ ‐ ‐ ‐ ‐ Number of connections to be rejected due to maxclient limit reached
# #keyspace_misses Number of Key value search failures (no hits)
master_link_down_since_seconds ##Duration of master-slave disconnection (in seconds)

Monitoring method

  • ##redis-benchmark
  • redis-stat
  • ##
  • redis-stat#
  • ##redislive
  • redis-cli
  • monitor
  • showlog
①get: Get the slow query log

②len: Get the number of slow query log entries

##③reset: Reset the slow query log

Related configuration:

slowlog-log-slower-than 1000 # 设置慢查询的时间下线,单位:微秒 slowlog-max-len 100 # 设置慢查询命令对应的日志显示长度,单位:命令数
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info (you can get all the information at once or by blocks Information)


server: Environment parameters for server running
  • clients: Client related information
  • memory: Server running memory statistics
  • persistence: persistence Chemical information
  • stats: General statistics
  • ##Replication: Master-slave replication related information
  • CPU: CPU usage
  • ##cluster: Cluster information
  • Keypass: Key-value pair statistical quantity information
  • Use the terminal info command
    ./redis-cli info 按块获取信息 | grep 需要过滤的参数./redis-cli info stats | grep ops
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    交互式info命令使用

    #./redis-cli> info server
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    性能监控:

    redis-cli info | grep ops # 每秒操作数

    内存监控

    [root@CombCloud-2020110836 src]# ./redis-cli info | grep used | grep human used_memory_human:2.99M # 内存分配器从操作系统分配的内存总量 used_memory_rss_human:8.04M #操作系统看到的内存占用,top命令看到的内存 used_memory_peak_human:7.77M # redis内存消耗的峰值 used_memory_lua_human:37.00K # lua脚本引擎占用的内存大小
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    由于BLPOP,BRPOP,or BRPOPLPUSH而备阻塞的客户端

    [root@CombCloud-2020110836 src]# ./redis-cli info | grep blocked_clients blocked_clients:0
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    由于最大内存限制被移除的key的数量

    [root@CombCloud-2020110836 src]# ./redis-cli info | grep evicted_keys evicted_keys:0 #
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    内存碎片率

    [[email protected] src]# ./redis-cli info | grep mem_fragmentation_ratiomem_fragmentation_ratio:2.74
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    已使用内存

    [[email protected] src]# ./redis-cli info | grep used_memory:used_memory:3133624
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    基本活动指标:

    redis连接了多少客户端 通过观察其数量可以确认是否存在意料之外的连接。如果发现数量不对劲,就可以使用lcient list指令列出所有的客户端链接地址来确定源头。

    [root@CombCloud-2020110836 src]# ./redis-cli info | grep connected_clients connected_clients:1 [root@CombCloud-2020110836 src]# ./redis-cli info | grep connected connected_clients:1 # 客户端连接数量 connected_slaves:1 # slave连接数量
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    持久性指标:

    [root@CombCloud-2020110836 src]# ./redis-cli info | grep rdb_last_save_time rdb_last_save_time:1591876204 # 最后一次持久化保存磁盘的时间戳 [root@CombCloud-2020110836 src]# ./redis-cli info | grep rdb_changes_since_last_save rdb_changes_since_last_save:0 # 自最后一次持久化以来数据库的更改数
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    错误指标

    由于超出最大连接数限制而被拒绝的客户端连接次数,如果这个数字很大,则意味着服务器的最大连接数设置得过低,需要调整maxclients

    [[email protected] src]# ./redis-cli info | grep connected_clientsconnected_clients:1
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    key值查找失败(没有命中)次数,出现多次可能是被hei ke gong ji

    [[email protected] src]# ./redis-cli info | grep keyspacekeyspace_misses:0
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    主从断开的持续时间(以秒为单位)

    [[email protected] src]# ./redis-cli info | grep rdb_changes_since_last_saverdb_changes_since_last_save:0
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    复制积压缓冲区如果设置得太小,会导致里面的指令被覆盖掉找不到偏移量,从而触发全量同步

    [[email protected] src]# ./redis-cli info | grep backlog_sizerepl_backlog_size:1048576
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    通过查看sync_partial_err变量的次数来决定是否需要扩大积压缓冲区,它表示主从半同步复制失败的次数

    [[email protected] src]# ./redis-cli info | grep sync_partial_errsync_partial_err:1
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    redis性能测试命令

    ./redis-benchmark -c 100 -n 5000
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    说明:100个连接,5000次请求对应的性能。

    更多编程相关知识,请访问:编程入门!!

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