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Redis，a popular open source in-memory database, allows users to set expiration time for a KEY-value pr. This feature can be enabled with the command “expire”, which allows users to set the time length for a given key to expire. It is a useful way to keep track of time sensitive data and make sure the data is not kept too long in the memory.
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The expire command is provided by Redis, and it can be used as –
127.0.0.1:6379> expire key 3600
This command will set the expiration time of the key to 3600 seconds. In this example, key will expire after 3600 seconds (which is equivalent to 1 hour). This helps in better storage management, data organization and scalability.
Aside from the expire command, Redis also provides several other commands related to the expiration time of a key-value pr.
The TTL command timestamps the remning life for a key. For example,
127.0.0.1:6379> ttl key
This command gives information about how much time is remning for a key to expire.
The PERSIST command stops the countdown of the left-over time of a key, thus making a key persistent. For example,
127.0.0.1:6379> persist key
This command will clear the expiration time of the key, and make it persistent.
Redis also supports a KEYS command, which is used to search all keys pattern that matches the given pattern. For example,
127.0.0.1:6379> KEYS my*
This command searches all the keys that start with “my”. This is useful in finding out all the keys that are already expired or near to expire.
Redis has many other commands and features related to the expiration time of a key-value pr. It provides an easy and effective way to help mntn the memory and make sure users access only those data which are valid and updated. Therefore, setting expiration time length for a key-value pr is a convenient way to make sure that the data is not kept too long in memory.
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標題名稱：Redis鍵值設置的過期時間長度（redis過期時間多長）
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