Redis Python - how to delete all keys according to a specific pattern In python, without python iterating

Redis Python - how to delete all keys according to a specific pattern In python, without python iterating

In Redis, you can delete all keys matching a specific pattern using the SCAN command along with the DEL command. However, if you want to achieve this without directly iterating through keys in Python, you'll still need to use Redis commands, as Redis itself doesn't provide a wildcard-based key deletion mechanism without iterating over the keys.

Here's how you can use the SCAN and DEL commands in Python to delete keys matching a specific pattern:

import redis # Connect to Redis redis_client = redis.StrictRedis(host='localhost', port=6379, db=0) # Specify the pattern for keys to delete pattern = "prefix_*" # Replace with your desired pattern # Use the SCAN command to get keys matching the pattern cursor = '0' keys_to_delete = [] while cursor != 0: cursor, keys = redis_client.scan(cursor=cursor, match=pattern) keys_to_delete.extend(keys) # Delete the keys using the DEL command if keys_to_delete: redis_client.delete(*keys_to_delete) print(f"Deleted {len(keys_to_delete)} keys matching the pattern.") else: print("No keys found matching the pattern.")

In this example, replace 'prefix_*' with your desired key pattern. The SCAN command is used to iteratively retrieve keys matching the pattern, and the DEL command is then used to delete those keys.

While this approach avoids explicitly iterating through keys in Python, it still involves using Redis commands to manage the deletion of keys based on a pattern.

Examples

  1. How to delete Redis keys by pattern in Python?

    • This query demonstrates how to delete keys matching a specific pattern in Redis using a single command without Python iterating.
    import redis redis_client = redis.StrictRedis(host='localhost', port=6379) # Delete all keys matching the pattern redis_client.delete(*redis_client.keys("user:*")) print("Deleted all keys with pattern 'user:*'")

  2. How to delete Redis keys using SCAN and PIPELINE in Python?

    • This query demonstrates how to use SCAN with PIPELINE to delete large numbers of keys efficiently, reducing Python iteration.
    import redis redis_client = redis.StrictRedis(host='localhost', port=6379) # Start a pipeline pipeline = redis_client.pipeline() # Use SCAN to find keys matching the pattern for key in redis_client.scan_iter("temp:*"): pipeline.delete(key) # Add delete commands to the pipeline # Execute the pipeline pipeline.execute() print("Deleted all keys with pattern 'temp:*' using pipeline.")

  3. How to use Redis LUA script to delete keys by pattern in Python?

    • This query shows how to use a LUA script to delete keys matching a pattern in Redis, which avoids Python iterating.
    import redis redis_client = redis.StrictRedis(host='localhost', port=6379) # LUA script to delete keys matching a pattern lua_script = """ local keys = redis.call('keys', ARGV[1]) for _, key in ipairs(keys) do redis.call('del', key) end """ # Execute the LUA script to delete keys redis_client.eval(lua_script, 0, "cache:*") print("Deleted all keys with pattern 'cache:*' using LUA script.")

  4. How to use Redis FLUSHDB to delete all keys in the current database?

    • This query discusses using FLUSHDB to delete all keys in the current Redis database, which avoids Python iteration.
    import redis redis_client = redis.StrictRedis(host='localhost', port=6379) # Delete all keys in the current database redis_client.flushdb() print("All keys in the current Redis database have been deleted.")

  5. How to use Redis FLUSHALL to delete all keys in all databases?

    • This query demonstrates how to use FLUSHALL to delete all keys in all Redis databases without iteration.
    import redis redis_client = redis.StrictRedis(host='localhost', port=6379) # Delete all keys in all databases redis_client.flushall() print("All keys in all Redis databases have been deleted.")

  6. How to delete Redis keys in a specific database by pattern in Python?

    • This query discusses how to delete keys in a specific Redis database that match a given pattern.
    import redis # Connect to a specific Redis database redis_client = redis.StrictRedis(host='localhost', port=6379, db=1) # Delete keys matching the pattern redis_client.delete(*redis_client.keys("session:*")) print("Deleted all keys with pattern 'session:*' in database 1.")

  7. How to delete Redis keys by pattern using EVAL command in Python?

    • This query demonstrates how to use the EVAL command to delete keys matching a pattern, avoiding Python iteration.
    import redis redis_client = redis.StrictRedis(host='localhost', port=6379) # LUA script to delete keys matching a pattern lua_script = """ local keys = redis.call('keys', ARGV[1]) if #keys > 0 then redis.call('del', unpack(keys)) end return #keys """ # Execute the LUA script to delete keys deleted_count = redis_client.eval(lua_script, 0, "log:*") print(f"Deleted {deleted_count} keys with pattern 'log:*'.")

  8. How to delete Redis keys by pattern without affecting performance in Python?

    • This query discusses efficient methods to delete keys by pattern in Redis to avoid performance bottlenecks.
    import redis redis_client = redis.StrictRedis(host='localhost', port=6379) # Use SCAN and PIPELINE for efficient deletion pipeline = redis_client.pipeline() for key in redis_client.scan_iter("temp:*"): pipeline.delete(key) pipeline.execute() # Execute all delete commands at once print("Efficiently deleted all keys with pattern 'temp:*'.")

  9. How to delete Redis keys by pattern with rate limiting in Python?

    • This query discusses deleting keys by pattern with rate limiting to avoid performance spikes in Redis.
    import redis import time redis_client = redis.StrictRedis(host='localhost', port=6379) # Use SCAN and delete keys with rate limiting to prevent performance spikes count = 0 for key in redis_client.scan_iter("temp:*"): redis_client.delete(key) count += 1 if count % 10 == 0: time.sleep(0.1) # Pause to avoid overwhelming Redis print("Deleted keys with rate limiting to prevent performance issues.")

  10. How to delete Redis keys by pattern in Redis Cluster in Python?

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