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                ## 常用運維命令 **顯示服務器時間 time** redis 127.0.0.1:6380> time 1) "1375270361" # 時間戳(秒) 2) "504511" # 微秒數 **查看當前數據庫的key的數量 dbsize** redis 127.0.0.1:6380> dbsize (integer) 2 redis 127.0.0.1:6380> select 2 OK **后臺進程重寫aof bgrewriteaof** 127.0.0.1:6379> bgrewriteaof Background append only file rewriting started **保存rdb快照 bgsave(后臺保存) save** 127.0.0.1:6379> bgsave #內存不阻塞,當前進程dump Background saving started **上次保存的時間** lastsave **清空數據** flushdb #清空當前db flushall #清空全部db **服務器關閉** Showdown [save/nosave] **查看redis服務器的信息,性能調優** Info [Replication/CPU/Memory..] **配置項管理** 動態獲取或設置`config,config get/set` 類似php中的`ini_set/get` `Config get` 配置項 `Config set` 配置項 值 (特殊的選項,不允許用此命令設置,如slave-of, 需要用單獨的slaveof命令來設置) 127.0.0.1:6379> config get dbfilename 1) "dbfilename" 2) "dump6379.rdb" 127.0.0.1:6379> config get slowlog-log-slower-than 1) "slowlog-log-slower-than" 2) "10000" #響應速度大于10000微妙的就會給記錄下來; 127.0.0.1:6379> config get slowlog-max-len 1) "slowlog-max-len" 2) "128" #最多能記錄128條慢查詢記錄; **slowlog get N** 獲取慢N條慢日志 ## Info需要注意的參數 **內存Memory** used_memory:859192 #數據結構的空間 used_memory_rss:7634944 #實占空間 mem_fragmentation_ratio:8.89 #前2者的比例,1.N為佳 如果此值過大,說明redis的內存的碎片化嚴重,可以導出再導入一次. **主從復制Replication** role:slave #當前服務器所占的角色slave還是master; master_host:192.168.1.128 #主服務器ip; master_port:6379 master_link_status:up **持久化Persistence** rdb_changes_since_last_save:0 #上次是什么時候改變的 rdb_last_save_time:1375224063 #上次是什么時候保存的 **fork耗時** #Status latest_fork_usec:936 #上次導出rdb快照,持久化花費微秒 注意: 如果某實例有10G內容,導出需要2分鐘, 每分鐘寫入10000次,導致不斷的rdb導出,磁盤始處于高IO狀態.
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