How to Set an Expiration Time For A Key In Redis?

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To set an expiration time for a key in Redis, you can use the EXPIRE or SETEX commands. The EXPIRE command allows you to set a timeout on a key, specifying the number of seconds until it expires. For example, the command "EXPIRE mykey 60" will make the key "mykey" expire in 60 seconds.


Alternatively, you can use the SETEX command to set a key with a specific timeout. This command allows you to set a key with a value and an expiration time in a single atomic operation. For example, the command "SETEX mykey 60 value" will set the key "mykey" with a value of "value" and make it expire in 60 seconds.


Setting expiration times for keys can be useful for scenarios where you want to automatically remove stale data from your Redis database or control the lifespan of temporary data.

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What is the maximum expiration time that can be set for a key in Redis?

The maximum expiration time that can be set for a key in Redis is 2^31 - 1 seconds, which is equal to 68 years, 19 weeks, 6 days, 10 hours, 48 minutes, and 5 seconds.


How to set a specific expiration time for a key in Redis using the EXPIREAT command?

To set a specific expiration time for a key in Redis using the EXPIREAT command, you can specify a Unix timestamp at which the key should expire. Here's the syntax to set an expiration time for a key using the EXPIREAT command:

1
EXPIREAT key timestamp


Where:

  • key is the name of the key you want to set an expiration time for.
  • timestamp is the Unix timestamp at which the key should expire.


For example, if you want to set a specific expiration time for a key named mykey to expire on January 1, 2022, you can use the following command:

1
EXPIREAT mykey 1641013200


This command will set the expiration time for the mykey key to January 1, 2022, at 00:00:00 UTC. The key will expire and be automatically deleted from Redis at that time.


How to set an expiration time for a key in Redis using the PEXPIRE key-value pair?

To set an expiration time for a key in Redis using the PEXPIRE key-value pair, follow these steps:

  1. Connect to your Redis server using the Redis command-line interface or a Redis client.
  2. Use the PEXPIRE command followed by the key name and the expiration time in milliseconds. For example, to set the key "mykey" to expire after 10 seconds, you would run the following command:
1
PEXPIRE mykey 10000


  1. If the key already exists and has a TTL (time to live) set on it, the new expiration time will override the existing TTL.


That's it! The key "mykey" will now automatically expire after the specified time. You can check the remaining time for expiration using the TTL command.

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