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Redis如何分析慢查询操作？
亿华云2025-10-02 19:00:28【数据库】6人已围观
简介什么是慢查询和mysql的慢SQL日志分析一样，redis也有类似的功能，来帮助定位一些慢查询操作。Redis slowlog是Redis用来记录查询执行时间的日志系统。查询执行时间指的是不包括像客户
什么是分析慢查询
和mysql的慢SQL日志分析一样，redis也有类似的慢查功能，来帮助定位一些慢查询操作。询操
Redis slowlog是分析Redis用来记录查询执行时间的日志系统。
查询执行时间指的慢查是不包括像客户端响应(talking)、发送回复等IO操作，询操而单单是分析执行一个查询命令所耗费的时间。云南idc服务商
另外，慢查slow log保存在内存里面，询操读写速度非常快，分析因此你可以放心地使用它，慢查不必担心因为开启slow log而损害Redis的询操速度。
慢查询参数
首先来关注下慢日志分析对应的分析两个参数：
1、slowlog-log-slower-than：预设阀值，慢查即记录超过多少时间的询操记录，默认为10000微秒，即10毫秒。
2、slowlog-max-len：记录慢查询的云服务器提供商条数，默认为128条，当超过设置的条数时最早进入队列的将被移除。线上建议增大数值，如：1000，这样可减少队列移除的频率。
127.0.0.1:6379> config get slowlog-log-slower-than 1) "slowlog-log-slower-than" 2) "10000" 127.0.0.1:6379> config get slowlog-max-len 1) "slowlog-max-len" 2) "128"可以用config set对这两个参数进行调整，或者在配置文件中设置。
################################## SLOW LOG ################################### # The Redis Slow Log is a system to log queries that exceeded a specified # execution time. The execution time does not include the I/O operations # like talking with the client, sending the reply and so forth, # but just the time needed to actually execute the command (this is the only # stage of command execution where the thread is blocked and can not serve # other requests in the meantime). # # You can configure the slow log with two parameters: one tells Redis # what is the execution time, in microseconds, to exceed in order for the # command to get logged, and the other parameter is the length of the # slow log. When a new command is logged the oldest one is removed from the # queue of logged commands. # The following time is expressed in microseconds, so 1000000 is equivalent # to one second. Note that a negative number disables the slow log, while # a value of zero forces the logging of every command. slowlog-log-slower-than 10000 # There is no limit to this length. Just be aware that it will consume memory. # You can reclaim memory used by the slow log with SLOWLOG RESET. slowlog-max-len 128慢查询命令
语法：slowlog subcommand [argument]
如，进行查询慢查询、获取慢查询记录的数量、亿华云重置慢查询日志等操作：
192.168.10.38:9001> slowlog get (empty list or set) 192.168.10.38:9001> slowlog get 10 (empty list or set) 192.168.10.38:9001> slowlog len (integer) 0 192.168.10.38:9001> slowlog reset OK很赞哦!（29234）
