Redis

Redis INCRBYFLOAT Command Explained

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In Redis, the INCRBYFLOAT command increments a floating point number by the specified amount. More specifically, it increments the string representing a floating point number stored at the specified key.

If the key doesn’t exist, INCRBYFLOAT creates the key with a value of 0 and then increments it by the specified amount.

An error occurs if the key contains a value of the wrong type, or if the current key content or the specified increment are not parsable as a double precision floating point number.

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Redis INCRBY Command Explained

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In Redis, the INCRBY command increments the value of a key by the specified amount.

If the key doesn’t exist, INCRBY creates the key with a value of 0 and then increments it by the specified amount.

An error occurs if the key contains a value of the wrong type or contains a string that cannot be represented as integer. INCRBY operations are limited to 64 bit signed integers.

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Redis INCR Command Explained

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In Redis, the INCR command increments the value of a specified key by one.

If the key doesn’t exist, INCR creates the key with a value of 0 and then increments it by one.

An error occurs if the key contains a value of the wrong type or contains a string that cannot be represented as integer. 

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Redis PERSIST Command Explained

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The Redis PERSIST command removes any existing timeout on a given key. It returns an integer reply of 1 if the timeout was removed, or 0 if the key doesn’t exist or doesn’t have an associated timeout.

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Redis PTTL Command Explained

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In Redis, the PTTL command returns the remaining time to live of a given key, in milliseconds.

If the key doesn’t have a timeout, an integer reply of -1 is returned. If the key doesn’t exist, -2 is returned.

PTTL works the same as the TTL command, except that it returns the result in milliseconds instead of seconds.

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Redis TTL Command Explained

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In Redis, the TTL command returns the remaining time to live of a given key, in seconds.

If the key doesn’t have a timeout, an integer reply of -1 is returned. If the key doesn’t exist, -2 is returned.

Redis also has a PTTL command, which works the same, but returns its result in milliseconds.

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Redis PEXPIRETIME Command Explained

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The Redis PEXPIRETIME command returns the absolute Unix timestamp in milliseconds at which the given key will expire. This is the number of milliseconds since 00:00:00 UTC on 1 January 1970 until the expiry time of the key.

This works exactly the same as EXPIRETIME, but it returns the Unix timestamp in milliseconds instead of seconds.

The PEXPIRETIME command was introduced in Redis 7.0.0.

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Redis EXPIRETIME Command Explained

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The Redis EXPIRETIME command returns the absolute Unix timestamp in seconds at which the given key will expire. This is the number of seconds since 00:00:00 UTC on 1 January 1970 until the expiry time of the key.

The EXPIRETIME command was introduced in Redis 7.0.0.

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Redis PEXPIREAT Command Explained

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The Redis PEXPIREAT command sets a timeout as a Unix timestamp on a given key in milliseconds. It works the same as the EXPIREAT command, except that it sets the timeout in milliseconds instead of seconds.

It’s also similar to the PEXPIRE command, but with an absolute Unix timestamp instead of a time interval.

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