Does Redis automatically delete expired keys?
Table of Contents
Does Redis automatically delete expired keys?
After the timeout has expired, the key will automatically be deleted. A key with an associated timeout is often said to be volatile in Redis terminology. The timeout will only be cleared by commands that delete or overwrite the contents of the key, including DEL, SET, GETSET and all the *STORE commands.
Does Redis cache expire?
3 Answers. In short – for each redis object, there is an expiration time. Unless you set the object to expire, that time is “never”. Now, the expiration mechanism itself is semi-lazy.
How does Redis store data in-memory?
Redis is an In-Memory Database(IMDB) as it relies on main memory of computer for data storage while others use Disk Storage database mechanism. That is why Redis is faster than disk-optimized databases because disk access is slower than memory access.
Which command is used to remove the expiration from a Redis key?
Redis PERSIST command
Redis PERSIST command is used to remove the expiration from the key.
How long can a redis key be?
512 MB
The maximum allowed size of a key is 512 MB. To reduce memory usage and facilitate key query, ensure that each key does not exceed 1 KB. The maximum allowed size of a string is 512 MB. The maximum allowed size of a Set, List, or Hash is 512 MB.
Does redis overwrite keys?
Redis SET command is used to set some string value in redis key. If the key already holds a value, it is overwritten, regardless of its type. Any previous time to live associated with the key is discarded on a successful SET operation.
Is Redis a key value store?
The Redis documentation says what it is not: “Redis is not a plain key-value store…” So, it (really) is a fast in-memory key-value store, where keys are always strings, but the value can actually be a number of different data types, with different operations supported on each data type.
How do I know when my Redis key expires?
Our Support Engineers used the TTL command to know the remaining time in seconds. So, Redis TTL helps the Redis client to check how many seconds are left for the key to expire. For instance, if we set the timeout on the key “key1” as 60, we can get the remaining time to live as follows.
Does Redis save to disk?
By default Redis saves snapshots of the dataset on disk, in a binary file called dump. You can configure Redis to have it save the dataset every N seconds if there are at least M changes in the dataset, or you can manually call the SAVE or BGSAVE commands.