Redis Eviction events occur when the memory limit defined in your configuration (or default settings) is reached and newer data needs to be added. When this happens, Redis uses its eviction policy to evict existing keys to make room for new data.
There are several eviction policies that Redis supports:
To set a specific eviction policy, you can update Redis configuration file
redis.conf or use the
CONFIG SET command as follows:
The choice of eviction policy greatly depends on what kind of data you're storing in Redis and how critical it is to preserve certain types of data over others.
You can monitor eviction events using Redis's
INFO command. The
evicted_keys field in the output shows the number of keys that have been evicted due to max memory limit:
In the output, look for:
evicted_keys indicates the total keys evicted due to max memory limit.
By understanding Redis eviction events and setting appropriate eviction policies, you can efficiently manage your memory usage in Redis.