{"id":13444,"date":"2024-03-15T07:08:16","date_gmt":"2024-03-15T07:08:16","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-can-redis-automatically-update-expiration-time\/"},"modified":"2025-08-05T18:27:03","modified_gmt":"2025-08-05T18:27:03","slug":"how-can-redis-automatically-update-expiration-time","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-redis-automatically-update-expiration-time\/","title":{"rendered":"Redis Auto-Update Expiration Guide"},"content":{"rendered":"

Redis offers the feature of automatically refreshing expiration times, which can be achieved using the EXPIRE and TTL commands.<\/p>\n

    \n
  1. Set the value of a key using the SET command and set an expiration time using the EXPIRE command, for example:<\/li>\n
  2. Set the key with a specified value and set an expiration time for the key in seconds.<\/li>\n
  3. When it is necessary to refresh the expiration time, one can use the TTL command to retrieve the remaining expiration time of a key, and then use the EXPIRE command to extend it, for example:<\/li>\n
  4. Set a time-to-live (TTL) for a key
    \nSet an expiration time for a key in seconds<\/li>\n
  5. Note: The TTL command returns -1 if the key exists indefinitely, and -2 if the key does not exist or has expired.<\/li>\n
  6. You can use Redis transactions to ensure atomicity, meaning that no other operations will interfere between getting the remaining expiration time and setting a new expiration time.<\/li>\n<\/ol>\n

    Here is an example code using Redis for automatically refreshing expiration time (using Node.js and the ioredis library):<\/p>\n

    const<\/span> Redis<\/span> = require<\/span>('ioredis'<\/span>);\r\nconst<\/span> redis = new<\/span> Redis<\/span>();\r\n\r\nconst<\/span> key = 'mykey'<\/span>;\r\nconst<\/span> seconds = 60<\/span>; \/\/ \u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u4e3a60\u79d2<\/span>\r\n\r\n\/\/ \u8bbe\u7f6e\u952e\u7684\u503c\u548c\u8fc7\u671f\u65f6\u95f4<\/span>\r\nredis.set<\/span>(key, 'myvalue'<\/span>);\r\nredis.expire<\/span>(key, seconds);\r\n\r\n\/\/ \u81ea\u52a8\u5237\u65b0\u8fc7\u671f\u65f6\u95f4<\/span>\r\nsetInterval<\/span>(async<\/span> () => {\r\n  const<\/span> ttl = await<\/span> redis.ttl<\/span>(key);\r\n  if<\/span> (ttl === -2<\/span>) {\r\n    console<\/span>.log<\/span>('Key does not exist or has expired'<\/span>);\r\n    clearInterval<\/span>(refreshInterval);\r\n  } else<\/span> if<\/span> (ttl === -1<\/span>) {\r\n    console<\/span>.log<\/span>('Key exists and does not have an expiration'<\/span>);\r\n  } else<\/span> {\r\n    console<\/span>.log<\/span>(`Refreshing expiration time: ${ttl}<\/span> seconds left`<\/span>);\r\n    redis.expire<\/span>(key, seconds);\r\n  }\r\n}, 5000<\/span>); \/\/ \u6bcf5\u79d2\u5237\u65b0\u4e00\u6b21\u8fc7\u671f\u65f6\u95f4<\/span>\r\n\r\n\/\/ \u505c\u6b62\u81ea\u52a8\u5237\u65b0\u8fc7\u671f\u65f6\u95f4<\/span>\r\nconst<\/span> refreshInterval = setInterval<\/span>(() =><\/span> {\r\n  clearInterval<\/span>(refreshInterval);\r\n}, 60000<\/span>); \/\/ 60\u79d2\u540e\u505c\u6b62\u81ea\u52a8\u5237\u65b0<\/span>\r\n<\/code><\/pre>\n
    In the example above, the value and expiration time of a key are initially set using the SET and EXPIRE commands. The setInterval timer is then used to refresh the expiration time, checking every 5 seconds if the key is still present and has remaining time. If the key exists and still has time remaining, a new expiration time is set using the EXPIRE command. The clearInterval function is used to stop the auto-refresh after 60 seconds.<\/p>\n","protected":false},"excerpt":{"rendered":"
    Redis offers the feature of automatically refreshing expiration times, which can be achieved using the EXPIRE and TTL commands. Set the value of a key using the SET command and set an expiration time using the EXPIRE command, for example: Set the key with a specified value and set an expiration time for the key […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[17923,17922,1456,17921,17924],"class_list":["post-13444","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-cache-refresh","tag-key-expiration","tag-redis-commands","tag-redis-ttl","tag-ttl-management"],"yoast_head":"\nRedis Auto-Update Expiration Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Automatically refresh Redis key TTL using EXPIRE commands. 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