My Notes Learning Redis Time-To-Live Key of Expiration

Redis can automatically clean data from memory using keyword. we can tell Redis to remove data at seconds, milisecond and epoch time.

List Command to Key Expirations

• TTL key : this comand return integer (seconds) expiration, -1 means key without TTL.
  • exp: TTL totalemployee
  • 
  • 19835 second= 5.50972222 hour
  • IF we need to show expiry in miliseconds, we can use PTTL Commands. this commands will give us total milisecond to expiry.
• PERSIST key : This command to remove time-to-live in key
  • exp: PERSIST totalemployee
  • 
• EXPIRE key seconds [NX | XX | GT | LT]: Set a Time-to-live on key. this command will set expiration of key in seconds
  • exp: EXPIRE totalemployee 1000
  • 
  • Options in EXPIRE
    • NX : Option expiry only when the key has no expiry.
    • XX : Option expiry only when the key has an existing expiry.
    • GT : Option expiry only when the new expiry is greater than current one.
    • LT : Option expiry only when the new expiry is less than current one.
  • Note : PEXPIRE this command to set expiry in miliseconds
• EXPIREAT key unix-time-seconds [NX | XX | GT | LT ]
  • EXPIREAT will set expiry of key in spesifice date and time.
  • exp : Wells we say to expiry of key at “2024:02:27 22:00:00” convert to unix-time-seconds = 1709042400.
  • command : EXPIREAT totalemployee 1709042400
  • The Options EXPIREAT same with command EXPIRE.
  • Note : PEXIREAT with set expiry in unix-timestamp-miliseconds.

Reference :

• https://university.redis.com/
• https://redis.io/commands

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