Redis is an open source key-value store database which provides data structures and data persistence. It supports many data types such as strings, hashes, sorted sets and lists. However, when storing data in Redis, there is a small chance of data inconsistency and data loss due to expired keys in Redis. Therefore, a regular audit of expired keys in Redis is necessary to ensure the data safety and integrity of Redis databases.

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The principle of expired keys listening in Redis is to scan the Redis memory periodically, detect expired keys in the memory, and delete expired keys from the database. The simplest way to clean up expired keys in Redis is to use system-level scripts to detect and delete expired keys.

The Python script below can be used for Redis expired key clean-up. This script will detect the expiration time of each key in the redis database, compare it to the current time, and delete the expired key if necessary.

import redis
 
# Initialize connection to Redis
conn = redis.Redis(host='localhost', port=6379, db=0)

# Get all keys in the database
keys = conn.keys()
# Iterate over all keys
for key in keys:
 
    # Get expiration time of each key
    ttl = conn.ttl(key)
 
    # Delete key If TTL is expired
    if ttl == -1 or ttl == -2 or ttl == 0:
        conn.delete(key)

Another way to clean up expired keys in Redis is to use a Redis Monitor script to detect and delete expired keys periodically. This method is more resource efficient and easier to mntn. It works by scanning the redis database periodically in fixed intervals and comparing the current time with the expiry time of the keys. Any expired key will be removed automatically.

To ensure the data safety and integrity of Redis databases, regular monitoring and management of expired keys is essential. System-level scripts, such as the Python script above, and redis monitoring scripts, can both be used to clean up expired keys in Redis. By cleaning up expired keys regularly, the data safety and integrity of Redis databases can be ensured, and the service performance of Redis can also be improved.

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