In Python applications that use Redis as a caching or data storage solution, it's often necessary to retrieve keys based on their Time-To-Live (TTL). This can be used to analyze the lifespan of particular keys or to perform actions on keys that are about to expire.
Please note that there is no direct method to get keys by TTL in Redis. You will have to fetch all keys and then filter them based on their TTL values.
This script connects to the Redis server, fetches all the keys, checks their TTL values, and stores the ones with a TTL in a dictionary.
KEYScommand in production environment as it can negatively impact performance. Prefer
SCANfor large databases.
ttlfunction will return
Nonein such cases.
Not considering the possibility of keys without TTL values. A key in Redis does not need to have a TTL value and trying to work with a non-existent TTL might cause errors in your program.
Q: Can we set TTL for a key in Redis?
A: Yes, using the
EXPIRE command you can set TTL for a key in Redis.
Q: What unit is TTL in Redis? A: TTL in Redis is expressed in seconds. If the TTL of a key is -1, it means that the key is persistent and won't expire.