> For the complete documentation index, see [llms.txt](https://redis.sai.show/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://redis.sai.show/di-4-zhang-shi-jian-redis-fu-wu-qi-he-ke-hu-duan-de-cao-zuo/4.2-cha-kan-redis-fu-wu-qi-de-xiang-xi-xin-xi.md). # 4.2 查看Redis服务器的详细信息 ## 4.2.1 通过`INFO`命令查看服务器信息 * `INFO` * 功能:查看服务端相关信息 例: ``` 127.0.0.1:6379> INFO # Server redis_version:6.2.6 redis_git_sha1:00000000 redis_git_dirty:0 redis_build_id:b61f37314a089f19 redis_mode:standalone os:Linux 5.15.49-linuxkit x86_64 arch_bits:64 multiplexing_api:epoll atomicvar_api:atomic-builtin gcc_version:10.2.1 process_id:1 process_supervised:no run_id:ec3f7b5d6eda8fa1c55555f82ede6dfd23e9a50c tcp_port:6379 server_time_usec:1691911379981145 uptime_in_seconds:300 uptime_in_days:0 hz:10 configured_hz:10 lru_clock:14189779 executable:/data/redis-server config_file: io_threads_active:0 # Clients connected_clients:1 cluster_connections:0 maxclients:10000 client_recent_max_input_buffer:24 client_recent_max_output_buffer:0 blocked_clients:0 tracking_clients:0 clients_in_timeout_table:0 # Memory used_memory:873648 used_memory_human:853.17K used_memory_rss:7856128 used_memory_rss_human:7.49M used_memory_peak:933848 used_memory_peak_human:911.96K used_memory_peak_perc:93.55% used_memory_overhead:830384 used_memory_startup:809880 used_memory_dataset:43264 used_memory_dataset_perc:67.85% allocator_allocated:1071104 allocator_active:1290240 allocator_resident:3805184 total_system_memory:8346099712 total_system_memory_human:7.77G used_memory_lua:37888 used_memory_lua_human:37.00K used_memory_scripts:0 used_memory_scripts_human:0B number_of_cached_scripts:0 maxmemory:0 maxmemory_human:0B maxmemory_policy:noeviction allocator_frag_ratio:1.20 allocator_frag_bytes:219136 allocator_rss_ratio:2.95 allocator_rss_bytes:2514944 rss_overhead_ratio:2.06 rss_overhead_bytes:4050944 mem_fragmentation_ratio:9.46 mem_fragmentation_bytes:7025240 mem_not_counted_for_evict:0 mem_replication_backlog:0 mem_clients_slaves:0 mem_clients_normal:20504 mem_aof_buffer:0 mem_allocator:jemalloc-5.1.0 active_defrag_running:0 lazyfree_pending_objects:0 lazyfreed_objects:0 # Persistence loading:0 current_cow_size:0 current_cow_size_age:0 current_fork_perc:0.00 current_save_keys_processed:0 current_save_keys_total:0 rdb_changes_since_last_save:20 rdb_bgsave_in_progress:0 rdb_last_save_time:1691911079 rdb_last_bgsave_status:ok rdb_last_bgsave_time_sec:-1 rdb_current_bgsave_time_sec:-1 rdb_last_cow_size:0 aof_enabled:0 aof_rewrite_in_progress:0 aof_rewrite_scheduled:0 aof_last_rewrite_time_sec:-1 aof_current_rewrite_time_sec:-1 aof_last_bgrewrite_status:ok aof_last_write_status:ok aof_last_cow_size:0 module_fork_in_progress:0 module_fork_last_cow_size:0 # Stats total_connections_received:1 total_commands_processed:3 instantaneous_ops_per_sec:0 total_net_input_bytes:74 total_net_output_bytes:20555 instantaneous_input_kbps:0.00 instantaneous_output_kbps:0.00 rejected_connections:0 sync_full:0 sync_partial_ok:0 sync_partial_err:0 expired_keys:0 expired_stale_perc:0.00 expired_time_cap_reached_count:0 expire_cycle_cpu_milliseconds:5 evicted_keys:0 keyspace_hits:0 keyspace_misses:0 pubsub_channels:0 pubsub_patterns:0 latest_fork_usec:0 total_forks:0 migrate_cached_sockets:0 slave_expires_tracked_keys:0 active_defrag_hits:0 active_defrag_misses:0 active_defrag_key_hits:0 active_defrag_key_misses:0 tracking_total_keys:0 tracking_total_items:0 tracking_total_prefixes:0 unexpected_error_replies:0 total_error_replies:0 dump_payload_sanitizations:0 total_reads_processed:4 total_writes_processed:3 io_threaded_reads_processed:0 io_threaded_writes_processed:0 # Replication role:master connected_slaves:0 master_failover_state:no-failover master_replid:557e052fd9196b70141b0e18a6c609dfceb06773 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:0 second_repl_offset:-1 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:0 repl_backlog_histlen:0 # CPU used_cpu_sys:0.487641 used_cpu_user:0.287673 used_cpu_sys_children:0.003459 used_cpu_user_children:0.001504 used_cpu_sys_main_thread:0.485370 used_cpu_user_main_thread:0.284587 # Modules # Errorstats # Cluster cluster_enabled:0 # Keyspace ``` | 属性 | 含义 | | :---------: | :---------------------------: | | Server | 服务端相关信息 | | Clients | 已连接的客户端信息 | | Memory | Redis服务端内存相关信息 | | Persistence | 持久化相关信息 | | Stats | 和服务端相关的统计信息 | | Replication | 主从复制相关信息 | | CPU | 服务端所在机器的CPU相关信息 | | Cluster | Redis集群相关信息 | | Keyspace | 和Redis数据库相关的统计信息.比如键的数量和超时时间等 | ## 4.2.2 查看客户端连接状况 * `INFO CLIENTS` * 功能:查看客户端的连接情况 例: ``` 127.0.0.1:6379> INFO CLIENTS # Clients connected_clients:1 cluster_connections:0 maxclients:10000 client_recent_max_input_buffer:16 client_recent_max_output_buffer:0 blocked_clients:0 tracking_clients:0 clients_in_timeout_table:0 ``` 其中: * `connected_clients`:正在连接的客户端数量 * `maxclients`:服务端允许的最大连接数 ## 4.2.3 观察最大连接数 * `INFO STATS` * 功能:查看服务端运行情况 [INFO STATS命令详解](https://blog.csdn.net/HiJamesChen/article/details/108998197) 例: ``` 127.0.0.1:6379> INFO STATS # Stats total_connections_received:1 total_commands_processed:6 instantaneous_ops_per_sec:0 total_net_input_bytes:150 total_net_output_bytes:24839 instantaneous_input_kbps:0.01 instantaneous_output_kbps:0.00 rejected_connections:0 sync_full:0 sync_partial_ok:0 sync_partial_err:0 expired_keys:0 expired_stale_perc:0.00 expired_time_cap_reached_count:0 expire_cycle_cpu_milliseconds:12 evicted_keys:0 keyspace_hits:0 keyspace_misses:0 pubsub_channels:0 pubsub_patterns:0 latest_fork_usec:0 total_forks:0 migrate_cached_sockets:0 slave_expires_tracked_keys:0 active_defrag_hits:0 active_defrag_misses:0 active_defrag_key_hits:0 active_defrag_key_misses:0 tracking_total_keys:0 tracking_total_items:0 tracking_total_prefixes:0 unexpected_error_replies:0 total_error_replies:0 dump_payload_sanitizations:0 total_reads_processed:7 total_writes_processed:6 io_threaded_reads_processed:0 io_threaded_writes_processed:0 ``` 其中: * `rejected_connections`:因超过最大连接数而被拒绝的客户端连接次数 查看最大连接数: ``` 127.0.0.1:6379> CONFIG GET maxclients 1) "maxclients" 2) "10000" ``` 可以看到,一般情况下是不会出现`rejected_connections`大于0的情况 ## 4.2.4 查看每秒执行多少条指令 在`INFO STATS`命令的返回值中,有一项名为`instantaneous_ops_per_sec`. * `instantaneous_ops_per_sec`:表示当前每秒执行的指令数量 若集群中某台Redis服务器中该数值过大或过小,就需要观察负载均衡的相关配置了.或者当数据库压力较大而通过该命令发现作为缓存的Redis服务器执行的指令过少时,就需要调整缓存策略 ## 4.2.5 观察内存用量 * `INFO MEMORY` * 功能:观察当前Redis服务器的内存使用情况 由于Redis是在内存中缓存数据,如果缓存数据太多,或者大量键没有设置过期时间(expired time),就会造成内存使用过大,从而导致OOM问题.此时需要通过`INFO MEMORY`命令观察Redis服务器的内存使用情况. ``` 127.0.0.1:6379> INFO MEMORY # Memory used_memory:871904 used_memory_human:851.47K used_memory_rss:7839744 used_memory_rss_human:7.48M used_memory_peak:933848 used_memory_peak_human:911.96K used_memory_peak_perc:93.37% used_memory_overhead:830392 used_memory_startup:809880 used_memory_dataset:41512 used_memory_dataset_perc:66.93% allocator_allocated:1133568 allocator_active:1368064 allocator_resident:3883008 total_system_memory:8346099712 total_system_memory_human:7.77G used_memory_lua:37888 used_memory_lua_human:37.00K used_memory_scripts:0 used_memory_scripts_human:0B number_of_cached_scripts:0 maxmemory:0 maxmemory_human:0B maxmemory_policy:noeviction allocator_frag_ratio:1.21 allocator_frag_bytes:234496 allocator_rss_ratio:2.84 allocator_rss_bytes:2514944 rss_overhead_ratio:2.02 rss_overhead_bytes:3956736 mem_fragmentation_ratio:9.44 mem_fragmentation_bytes:7008848 mem_not_counted_for_evict:0 mem_replication_backlog:0 mem_clients_slaves:0 mem_clients_normal:20512 mem_aof_buffer:0 mem_allocator:jemalloc-5.1.0 active_defrag_running:0 lazyfree_pending_objects:0 lazyfreed_objects:0 ``` 其中: * `used_memory_human`:以人类可读形式展示Redis已使用的内存 * `used_memory_peak_human`:以人类可读形式展示Redis使用的内存峰值 * `used_memory_lua_human`:以人类可读形式展示LUA脚本占用的内存大小 * `used_memory_scripts_human`:以人类可读形式展示脚本占用的内存大小 * `mem_clients_slaves`:因客户端主从复制而使用的内存大小 ## 4.2.6 通过`COMMAND`命令查看Redis命令 * `COMMAND` * 功能:返回Redis的命令信息 例: ``` 127.0.0.1:6379> COMMAND 1) 1) "psubscribe" 2) (integer) -2 3) 1) pubsub 2) noscript 3) loading 4) stale 4) (integer) 0 5) (integer) 0 6) (integer) 0 7) 1) @pubsub 2) @slow 2) 1) "lpos" 2) (integer) -3 3) 1) readonly 4) (integer) 1 5) (integer) 1 6) (integer) 1 7) 1) @read 2) @list 3) @slow 3) 1) "rpushx" 2) (integer) -3 3) 1) write 2) denyoom 3) fast 4) (integer) 1 5) (integer) 1 6) (integer) 1 7) 1) @write 2) @list 3) @fast 4) 1) "setbit" 2) (integer) 4 3) 1) write 2) denyoom 4) (integer) 1 5) (integer) 1 6) (integer) 1 7) 1) @write 2) @bitmap 3) @slow 5) 1) "georadius_ro" 2) (integer) -6 3) 1) readonly 4) (integer) 1 5) (integer) 1 6) (integer) 1 7) 1) @read 2) @geo 3) @slow 6) 1) "command" 2) (integer) -1 3) 1) random 2) loading 3) stale 4) (integer) 0 5) (integer) 0 6) (integer) 0 7) 1) @slow 2) @connection 7) 1) "debug" 2) (integer) -2 3) 1) admin 2) noscript 3) loading 4) stale 4) (integer) 0 5) (integer) 0 6) (integer) 0 7) 1) @admin 2) @slow 3) @dangerous 8) 1) "bzpopmin" 2) (integer) -3 3) 1) write 2) noscript 3) fast 4) (integer) 1 5) (integer) -2 6) (integer) 1 7) 1) @write 2) @sortedset 3) @fast 4) @blocking 9) 1) "xrevrange" 2) (integer) -4 3) 1) readonly 4) (integer) 1 5) (integer) 1 6) (integer) 1 7) 1) @read 2) @stream 3) @slow ... 223) 1) "hrandfield" 2) (integer) -2 3) 1) readonly 2) random 4) (integer) 1 5) (integer) 1 6) (integer) 1 7) 1) @read 2) @hash 3) @slow 224) 1) "scan" 2) (integer) -2 3) 1) readonly 2) random 4) (integer) 0 5) (integer) 0 6) (integer) 0 7) 1) @keyspace 2) @read 3) @slow ``` ## 4.2.7 查看指定Redis命令的信息 * `COMMAND INFO` * 语法:`COMMAND INFO key [key ...]` * 功能:查看指定命令的详细信息 例: ``` 127.0.0.1:6379> COMMAND INFO set 1) 1) "set" 2) (integer) -3 3) 1) write 2) denyoom 4) (integer) 1 5) (integer) 1 6) (integer) 1 7) 1) @write 2) @string 3) @slow ``` ``` 127.0.0.1:6379> COMMAND INFO get 1) 1) "get" 2) (integer) 2 3) 1) readonly 2) fast 4) (integer) 1 5) (integer) 1 6) (integer) 1 7) 1) @read 2) @string 3) @fast ``` ## 4.2.8 获取指定命令的所有键 * `COMMAND GETKEYS` * 语法:`COMMAND GETKEYS command` * 功能:获取command命令中所有的键 例: ``` 127.0.0.1:6379> COMMAND GETKEYS MSET name Peter age 18 score 100 1) "name" 2) "age" 3) "score" ``` `MSET`命令可以设置多个键值对,前边加上`COMMAND GETKEYS`即可获得该命令操作的所有key名 注:`COMMAND GETKEYS`命令后的command部分实际上并没有真正执行 ``` 127.0.0.1:6379> GET name (nil) 127.0.0.1:6379> GET age (nil) 127.0.0.1:6379> GET score (nil) ``` 例: ``` 127.0.0.1:6379> COMMAND GETKEYS SET name Mary 1) "name" ``` ``` 127.0.0.1:6379> GET name (nil) ``` --- # Agent Instructions This documentation is published with GitBook. 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