¿Qué es el TTL predeterminado en Redis?

What is default TTL in Redis?

By default, keys are set to live forever. The keys with no expiration time set will not expire. If you mean TTL command specifically, starting with v2. 8, it will return -2 if no EXPIRE value is set.

Atomicity of scripts Redis uses the same Lua interpreter to run all the commands. Also Redis guarantees that a script is executed in an atomic way: no other script or Redis command will be executed while a script is being executed. However this also means that executing slow scripts is not a good idea.

time to live
In networking, time to live (TTL) determines how long to cache either a query or content. The TTL meaning differs based on the kind of TTL being described.

Generally, we recommend a TTL of 24 hours (86,400 seconds). However, if you are planning to make DNS changes, you should lower the TTL to 5 minutes (300 seconds) at least 24 hours in advance of making the changes. After the changes are made, increase the TTL back to 24 hours.

TTL key. Returns the remaining time to live of a key that has a timeout. This introspection capability allows a Redis client to check how many seconds a given key will continue to be part of the dataset. In Redis 2.6 or older the command returns -1 if the key does not exist or if the key exist but has no associated expire.

Atomicity of scripts Redis uses the same Lua interpreter to run all the commands. Also Redis guarantees that a script is executed in an atomic way: no other script or Redis command will be executed while a script is being executed. This semantic is similar to the one of MULTI / EXEC.

It is just a Lua program that will run in the context of the Redis server. The second argument of EVAL is the number of arguments that follows the script (starting from the third argument) that represent Redis key names.

This introspection capability allows a Redis client to check how many seconds a given key will continue to be part of the dataset. In Redis 2.6 or older the command returns -1 if the key does not exist or if the key exist but has no associated expire.