Reputation: 272214

How do I delete everything in Redis?

I want to delete all keys. I want everything wiped out and give me a blank database.

Is there a way to do this in Redis client?

Upvotes: 968

Answers (28)

Kaidul

Reputation: 15895

Apart from the CLI approach, programmatically the following method worked for me i.e. deleting everything of the current connected Database on your Jedis cluster.

public static void resetRedis() {
    jedisCluster = RedisManager.getJedis(); // your JedisCluster instance

    for (JedisPool pool : jedisCluster.getClusterNodes().values()) {

        try (Jedis jedis = pool.getResource()) {
            jedis.flushAll();
        }
        catch (Exception ex){
            System.out.println(ex.getMessage());
        }
    }

}

Upvotes: 13

Archit Singh

Reputation: 169

After you start the Redis-server using:service redis-server start --port 8000 or redis-server.

Use redis-cli -p 8000 to connect to the server as a client in a different terminal.

You can use either

FLUSHDB - Delete all the keys of the currently selected DB. This command never fails. The time-complexity for this operation is O(N), N being the number of keys in the database.
FLUSHALL - Delete all the keys of all the existing databases, not just the currently selected one. This command never fails. The time-complexity for this operation is O(N), N being the number of keys in all existing databases.

Check the documentation for ASYNC option for both.

If you are using Redis through its python interface, use these two functions for the same functionality:

def flushall(self):
    "Delete all keys in all databases on the current host"
    return self.execute_command('FLUSHALL')

def flushdb(self):
    "Delete all keys in the current database"
    return self.execute_command('FLUSHDB')

Upvotes: 5

Suraj Bhandari

Reputation: 27

Better to check Redis documentation for commands https://redis.io/docs/latest/commands/

FLUSH ALL-

[https://redis.io/docs/latest/commands/flushall/][2]

Upvotes: 0

Rokonz Zaz

Reputation: 176

redis-cli flushall

i think it should be work in redis

Upvotes: 0

qingmu

Reputation: 482

I know there are two ways to clear the Redis database.

FLUSHALL Remove all keys from all databases;
```
# redis-cli flushall
```

FLUSHDB Remove all keys from the current database

# redis-cli -p 6000 select 0
# redis-cli flushdb

This operation is quite dangerous, please make sure to exclude the production environment configuration before the operation.

Upvotes: 3

Javier

Reputation: 62631

With redis-cli:

FLUSHDB – Deletes all keys from the connection's current database.
FLUSHALL – Deletes all keys from all databases on current host.

For example, in your shell:

redis-cli flushall

Upvotes: 1568

dyslexicanaboko

Reputation: 4285

For anyone wondering how to do this in C# it's the same as the answer provided for Python for this same question.

I am using StackExchange.Redis v2.2.88 for a dot net (core) 5 project. I only need to clear my keys for integration testing and I have no purpose to do this in production.

I checked what is available in intellisense and I don't see a stock way to do this with the existing API. I imagine this is intentional and by design. Luckily the API does expose an Execute method.

I tested this by doing the following:

Opened up a command window. I am using docker, so I did it through docker.
Type in redis-cli which starts the CLI
Type in KEYS * and it shows me all of my keys so I can verify they exist before and after executing the following code below:

//Don't abuse this, use with caution var cache = ConnectionMultiplexer.Connect( new ConfigurationOptions { EndPoints = { "localhost:6379" } });

var db = _cache.GetDatabase();

db.Execute("flushdb");
Type in KEYS * again and view that it's empty.

Hope this helps anyone looking for it.

Upvotes: 1

Flash Noob

Reputation: 500

If you want to clear redis in windows: find redis-cli in

C:\Program Files\Redis and run FLUSHALL command.

Upvotes: 1

mar1

Reputation: 233

you can use flushall in your terminal

redis-cli> flushall

Upvotes: 22

Jose Nobile

Reputation: 3363

This works for me: redis-cli KEYS \* | xargs --max-procs=16 -L 100 redis-cli DEL

It list all Keys in redis, then pass using xargs to redis-cli DEL, using max 100 Keys per command, but running 16 command at time, very fast and useful when there is not FLUSHDB or FLUSHALL due to security reasons, for example when using Redis from Bitnami in Docker or Kubernetes. Also, it doesn't require any additional programming language and it just one line.

Upvotes: 4

arnabmitra

Reputation: 953

Use FLUSHALL ASYNC if using (Redis 4.0.0 or greater) else FLUSHALL.

https://redis.io/commands/flushall

Note: Everything before executing FLUSHALL ASYNC will be evicted. The changes made during executing FLUSHALL ASYNC will remain unaffected.

Upvotes: 8

AbhiK

Reputation: 279

you can use following approach in python

def redis_clear_cache(self):

    try:
        redis_keys = self.redis_client.keys('*')
    except Exception as e:
        # print('redis_client.keys() raised exception => ' + str(e))
        return 1

    try:
        if len(redis_keys) != 0:
            self.redis_client.delete(*redis_keys)
    except Exception as e:
        # print('redis_client.delete() raised exception => ' + str(e))
        return 1

    # print("cleared cache")
    return 0

Upvotes: 1

roottraveller

Reputation: 8232

If you are using Java then from the documentation, you can use any one of them based on your use case.

/**
 * Remove all keys from all databases.
 *
 * @return String simple-string-reply
 */
String flushall();

/**
 * Remove all keys asynchronously from all databases.
 *
 * @return String simple-string-reply
 */
String flushallAsync();

/**
 * Remove all keys from the current database.
 *
 * @return String simple-string-reply
 */
String flushdb();

/**
 * Remove all keys asynchronously from the current database.
 *
 * @return String simple-string-reply
 */
String flushdbAsync();

Code:

RedisAdvancedClusterCommands syncCommands = // get sync() or async() commands 
syncCommands.flushdb();

Upvotes: 0

user9869932

Reputation: 7377

You can use FLUSHDB

e.g

List databases:

127.0.0.1:6379> info keyspace
# Keyspace

List keys

127.0.0.1:6379> keys *
(empty list or set)

Add one value to a key

127.0.0.1:6379> lpush key1 1
(integer) 1
127.0.0.1:6379> keys *
1) "key1"
127.0.0.1:6379> info keyspace
# Keyspace
db0:keys=1,expires=0,avg_ttl=0

Create other key with two values

127.0.0.1:6379> lpush key2 1
(integer) 1
127.0.0.1:6379> lpush key2 2
(integer) 2
127.0.0.1:6379> keys *
1) "key1"
2) "key2"
127.0.0.1:6379> info keyspace
# Keyspace
db0:keys=2,expires=0,avg_ttl=0

List all values in key2

127.0.0.1:6379> lrange key2 0 -1
1) "2"
2) "1"

Do FLUSHDB

127.0.0.1:6379> flushdb
OK

List keys and databases

127.0.0.1:6379> keys *
(empty list or set)
127.0.0.1:6379> info keyspace
# Keyspace

Upvotes: 2

不辞长做岭南人

Reputation: 481

There are different approaches. If you want to do this from remote, issue flushall to that instance, through command line tool redis-cli or whatever tools i.e. telnet, a programming language SDK. Or just log in that server, kill the process, delete its dump.rdb file and appendonly.aof(backup them before deletion).

Upvotes: 0

Manvendra Jina

Reputation: 117

Its better if you can have RDM (Redis Desktop Manager). You can connect to your redis server by creating a new connection in RDM.

Once its connected you can check the live data, also you can play around with any redis command.

Opening a cli in RDM.

1) Right click on the connection you will see a console option, just click on it a new console window will open at the bottom of RDM.

Coming back to your question FLUSHALL is the command, you can simply type FLUSHALL in the redis cli.

Moreover if you want to know about any redis command and its proper usage, go to link below. https://redis.io/commands.

Upvotes: 0

behzad babaei

Reputation: 1161

Open redis-cli and type:

FLUSHALL

Upvotes: 10

Raviraj Singh

Reputation: 7

Your questions seems to be about deleting entire keys in a database. In this case you should try:

Connect to redis. You can use the command redis-cli (if running on port 6379), else you will have to specify the port number also.
Select your database (command select {Index})
Execute the command flushdb

If you want to flush keys in all databases, then you should try flushall.

Upvotes: 1

gobi

Reputation: 515

redis-cli -h <host> -p <port> flushall

It will remove all data from client connected(with host and port)

Upvotes: 5

Denys

Reputation: 1488

Stop Redis instance.
Delete RDB file.
Start Redis instance.

Upvotes: 5

tcrabsheen

Reputation: 106

i think sometimes stop the redis-server and delete rdb，aof files。 make sure there’s no data can be reloading. then start the redis-server,now it's new and empty.

Upvotes: 3

athavan kanapuli

Reputation: 492

FLUSHALL Deletes all the Keys of All exisiting databases . FOr Redis version > 4.0 , FLUSHALL ASYNC is supported which runs in a background thread wjthout blocking the server https://redis.io/commands/flushall

FLUSHDB - Deletes all the keys in the selected Database . https://redis.io/commands/flushdb

The time complexity to perform the operations will be O(N) where N being the number of keys in the database.

The Response from the redis will be a simple string "OK"

Upvotes: 6

Denys

Reputation: 1488

One more option from my side:

In our production and pre-production databases there are thousands of keys. Time to time we need to delete some keys (by some mask), modify by some criteria etc. Of course, there is no way to do it manually from CLI, especially having sharding (512 logical dbs in each physical).

For this purpose I write java client tool that does all this work. In case of keys deletion the utility can be very simple, only one class there:

public class DataCleaner {

    public static void main(String args[]) {
        String keyPattern = args[0];
        String host = args[1];
        int port = Integer.valueOf(args[2]);
        int dbIndex = Integer.valueOf(args[3]);

        Jedis jedis = new Jedis(host, port);

        int deletedKeysNumber = 0;
        if(dbIndex >= 0){
            deletedKeysNumber += deleteDataFromDB(jedis, keyPattern, dbIndex);
        } else {
            int dbSize = Integer.valueOf(jedis.configGet("databases").get(1));
            for(int i = 0; i < dbSize; i++){
                deletedKeysNumber += deleteDataFromDB(jedis, keyPattern, i);
            }
        }

        if(deletedKeysNumber == 0) {
            System.out.println("There is no keys with key pattern: " + keyPattern + " was found in database with host: " + host);
        }
    }

    private static int deleteDataFromDB(Jedis jedis, String keyPattern, int dbIndex) {
        jedis.select(dbIndex);
        Set<String> keys = jedis.keys(keyPattern);
        for(String key : keys){
            jedis.del(key);
            System.out.println("The key: " + key + " has been deleted from database index: " + dbIndex);
        }

        return keys.size();
    }

}

Writing such kind of tools I find very easy and spend no more then 5-10 min.

Upvotes: 8

ungabunga

Reputation: 53

You can use FLUSHALL which will delete all keys from your every database. Where as FLUSHDB will delete all keys from our current database.

Upvotes: 5

Tw Bert

Reputation: 3809

Answers so far are absolutely correct; they delete all keys.

However, if you also want to delete all Lua scripts from the Redis instance, you should follow it by:

SCRIPT FLUSH

The OP asks two questions; this completes the second question (everything wiped).

Upvotes: 32

The Real Bill

Reputation: 15793

Heads up that FLUSHALL may be overkill. FLUSHDB is the one to flush a database only. FLUSHALL will wipe out the entire server. As in every database on the server. Since the question was about flushing a database I think this is an important enough distinction to merit a separate answer.

Upvotes: 246