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

##NameDescription##                                                                                                     Cache hit rate (calculated )

Memory indicator: Memory

#                 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

##                                                                                                                                                                                                               #                              

#               Name	Description
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 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 交互式info命令使用 #./redis-cli> info server 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 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 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 # 内存碎片率 [[email protected] src]# ./redis-cli info | grep mem_fragmentation_ratiomem_fragmentation_ratio:2.74 已使用内存 [[email protected] src]# ./redis-cli info | grep used_memory:used_memory:3133624 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 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 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 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 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 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 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 redis性能测试命令 ./redis-benchmark -c 100 -n 5000 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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