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redis 性能指标监控命令
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大家在学习的过程中，一定要学会经常使用help来了解命令的具体用法。
1.info (监控一般使用这个命令读取数据)
127.0.0.1:6379> help info
INFO [section]
summary: Get information and statistics about the server
since: 1.0.0
group: server
127.0.0.1:6379> info
# Server
redis_version:3.0.7
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:8d64350b19f2f7d2
redis_mode:standalone
os:Linux 2.6.32-504.el6.x86_64 x86_64
arch_bits:64
multiplexing_api:epoll
gcc_version:4.4.7
process_id:1096
run_id:2fc6a6e9638de4b9bccce3def6b40bb7b69e5240
tcp_port:6379
uptime_in_seconds:1668
uptime_in_days:0
hz:10
lru_clock:3766532
config_file:/etc/redis/6379.conf
# Clients
connected_clients:3
client_longest_output_list:0
client_biggest_input_buf:0
blocked_clients:0
# Memory
used_memory:856928
used_memory_human:836.84K
used_memory_rss:3223552
used_memory_peak:856968
used_memory_peak_human:836.88K
used_memory_lua:36864
mem_fragmentation_ratio:3.76
mem_allocator:jemalloc-3.6.0
# Persistence
loading:0
rdb_changes_since_last_save:0
rdb_bgsave_in_progress:0
rdb_last_save_time:1480159872
rdb_last_bgsave_status:ok
rdb_last_bgsave_time_sec:-1
rdb_current_bgsave_time_sec:-1
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
# Stats
total_connections_received:2
total_commands_processed:189
instantaneous_ops_per_sec:0
total_net_input_bytes:3340
total_net_output_bytes:66405
instantaneous_input_kbps:0.00
instantaneous_output_kbps:0.04
rejected_connections:0
sync_full:0
sync_partial_ok:0
sync_partial_err:0
expired_keys:0
evicted_keys:0
keyspace_hits:0
keyspace_misses:0
pubsub_channels:0
pubsub_patterns:0
latest_fork_usec:0
migrate_cached_sockets:0
# Replication
role:slave
master_host:192.168.1.93
master_port:6380
master_link_status:up
master_last_io_seconds_ago:9
master_sync_in_progress:0
slave_repl_offset:2283
slave_priority:100
slave_read_only:1
connected_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
# CPU
used_cpu_sys:0.97
used_cpu_user:0.42
used_cpu_sys_children:0.00
used_cpu_user_children:0.00
# Cluster
cluster_enabled:0
# Keyspace
db0:keys=1,expires=0,avg_ttl=0
2.monitor (影响性能，谨慎使用)
127.0.0.1:6379> help monitor
MONITOR -
summary: Listen for all requests received by the server in real time
since: 1.0.0
group: server
127.0.0.1:6379> monitor
OK
1480161369.716981 [0 192.168.1.93:6380] "PING"
1480161379.816223 [0 192.168.1.93:6380] "PING"
1480161389.930811 [0 192.168.1.93:6380] "PING"
1480161400.047882 [0 192.168.1.93:6380] "PING"
1480161409.461477 [0 127.0.0.1:42333] "info"
1480161410.143357 [0 192.168.1.93:6380] "PING"
1480161420.267618 [0 192.168.1.93:6380] "PING"
1480161421.141619 [0 127.0.0.1:42333] "info" "all"
1480161430.367934 [0 192.168.1.93:6380] "PING"
1480161440.496221 [0 192.168.1.93:6380] "PING"
3.slowlog
127.0.0.1:6379> help slowlog
SLOWLOG subcommand [argument]
summary: Manages the Redis slow queries log
since: 2.2.12
group: server
127.0.0.1:6379> slowlog get
1) 1) (integer) 17
2) (integer) 1480161791
3) (integer) 12
4) 1) "config"
2) "set"
3) "slowlog-log-slower-than"
4) "10"
127.0.0.1:6379> slowlog len
(integer) 2