In Redis, we have several options for returning the expiry time of a key. One option from Redis 7.0.0 and above is to return it as a Unix timestamp.
When returning the expiry as a Unix timestamp, we can have it returned in seconds or milliseconds. To return it in seconds, we can use the EXPIRETIME command. To return it in milliseconds, we can use the PEXPIRETIME command.
In Redis, it’s possible to set a key only if it doesn’t already exist. As with most things, there’s more than one way to do this.
Continue readingRedis 7.0.0 introduced some potentially useful options for setting timeouts on keys. One of these is the GT option, which allows us to set the expiry only if the new expiry is greater than the existing one.
The GT option is available for commands such as EXPIRE, EXPIREAT, PEXPIRE, and PEXPIREAT.
In Redis, the SCARD command returns the number of members in the specified set. This is referred to as the cardinality of the set.
In Redis, the SADD command allows us to add members to a key. We can add multiple members if required.
A Redis set is an unordered collection of unique strings (members).
Continue readingWhen working with Redis, we have a number of options for setting keys that store string values.
Here are six ways to set a string value in Redis.
Continue readingA Redis key can have an optional timeout, which makes the key expire after a certain amount of time, or at a certain time. We can use a couple of methods to remove any timeout associated with a key.
Here are two ways to remove a key’s expiry in Redis.
Continue readingWhen using the SET command to set a key in Redis, we can use the GET option to return its old value. This allows us to update the value of a key while returning the value that we’re replacing it with.
Note that this option was introduced in Redis 7.0.0, so if it doesn’t work, check your Redis version. If using an earlier version, try the GETSET command instead (which is deprecated from Redis version 6.2.0).
In Redis, we can use the OBECT IDLETIME command to check how many seconds has passed since the last access to a given key.
In Redis, we have several options for decrementing a key. By this, I mean, reducing the value of a key by one or more. For example, if we set a key to 15, we can decrement it by 1 to make 14. Or we can increment it by whatever amount we desire.
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