Redis command to get all available keys?

Question

Is there a Redis command for fetching all keys in the database? I have seen some python-redis libraries fetching them. But was wondering if it is possible from redis-client.

Zennie

IMPORTANT CONTENT: don't run KEYS on your production server unless you know what you're doing. – Peebles

Answer 1

Try to look at KEYS command. KEYS * will list all keys stored in redis.

EDIT: please note the warning at the top of KEYS documentation page:

Time complexity: O(N) with N being the number of keys in the database, under the assumption that the key names in the database and the given pattern have limited length.

UPDATE (V2.8 or greater): SCAN is a superior alternative to KEYS, in the sense that it does not block the server nor does it consume significant resources. Prefer using it.

Sliding

CLI usage example: redis-cli keys "*" – Cacophony

Correction: All redis commands are single-thread and will block the server. The only difference is that KEYS has the potential of blocking the server for longer when querying a large data set – Hanhana

also don't forget to do "select DatabaseNubmer" first – Carousal

Answer 2

Updated for Redis 2.8 and above

As noted in the comments of previous answers to this question, KEYS is a potentially dangerous command since your Redis server will be unavailable to do other operations while it serves it. Another risk with KEYS is that it can consume (dependent on the size of your keyspace) a lot of RAM to prepare the response buffer, thus possibly exhausting your server's memory.

Version 2.8 of Redis had introduced the SCAN family of commands that are much more polite and can be used for the same purpose.

The CLI also provides a nice way to work with it:

$ redis-cli --scan --pattern '*'

Decorticate

For me this command also worked redis-cli --scan * does it has some downside? – Bubble

Answer 3

It can happen that using redis-cli, you connect to your remote redis-server, and then the command:

KEYS *

is not showing anything, or better, it shows:
(empty list or set)

If you are absolutely sure that the Redis server you use is the one you have the data, then maybe your redis-cli is not connecting to the Redis correct database instance.

As it is mentioned in the Redis docs, new connections connect as default to the db 0.

In my case KEYS command was not retrieving results because my database was 1. In order to select the db you want, use SELECT.
The db is identified by an integer.

SELECT 1
KEYS *

I post this info because none of the previous answers was solving my issue.

Heldentenor

how do I execute the command directly from a shell redis-cli keys "*", rather than first connecting to the server. – Nesbitt

Answer 4

Get All Keys In Redis

Get all keys using the --scan option:

$ redis-cli --scan --pattern '*'

List all keys using the KEYS command:

$ redis-cli KEYS '*'

Neela

Answer 5

-->Get all keys from redis-cli

-redis 127.0.0.1:6379> keys *

-->Get list of patterns

-redis 127.0.0.1:6379> keys d??

This will produce keys which start by 'd' with three characters.

-redis 127.0.0.1:6379> keys *t*

This wil get keys with matches 't' character in key

-->Count keys from command line by

-redis-cli keys * |wc -l

-->Or you can use dbsize

-redis-cli dbsize

Screens

Just copied the answers and tried. It gave "unknown command 'key'". "key" is not the command, "keys" is. Please correct key *t* to keys *t*. – Tsana

Thanks dude for that information.it was my mistake.current i am on mobile.i will change that command eairlier. – Screens

Very useful cheatsheet this – Arrears

Answer 6

Take a look at following Redis Cheat Sheet. To get a subset of redis keys with the redis-cli i use the command

KEYS "prefix:*"

Hydromancy

Answer 7

Yes, you can get all keys by using this

var redis = require('redis');
redisClient = redis.createClient(redis.port, redis.host);    
  redisClient.keys('*example*', function (err, keys) {
})

Windpipe

Not exactly what the OP was asking (redis-cli), but thanks for pointing this out nevertheless. – Annulose

Answer 8

SCAN doesn't require the client to load all the keys into memory like KEYS does. SCAN gives you an iterator you can use. I had a 1B records in my redis and I could never get enough memory to return all the keys at once.

Here is a python snippet to get all keys from the store matching a pattern and delete them:

import redis
r = redis.StrictRedis(host='localhost', port=6379, db=0)
for key in r.scan_iter("key_pattern*"):
    print key

Lapidify

Answer 9

redis-cli -h <host> -p <port> keys * 

where * is the pattern to list all keys

Lashley

I had to quote the star, as follows: redis-cli -h <host> -p <port> keys '*' – Morgen

Answer 10

KEYS pattern

Available since 1.0.0.

Time complexity: O(N) with N being the number of keys in the database, under the assumption that the key names in the database and the given pattern have limited length.

Returns all keys matching pattern.

Warning : This command is not recommended to use because it may ruin performance when it is executed against large databases instead of KEYS you can use SCAN or SETS.

Example of KEYS command to use :

redis> MSET firstname Jack lastname Stuntman age 35
"OK"
redis> KEYS *name*
1) "lastname"
2) "firstname"
redis> KEYS a??
1) "age"
redis> KEYS *
1) "lastname"
2) "age"
3) "firstname"

Interception

Answer 11

You can simply connect to your redis server using redis-cli, select your database and type KEYS *, please remember it will give you all the keys present in selected redis database.

Freshen

beginner at redis here, can you detail your solution pls? – Chaucerian

just fire redis-cli KEYS '*' command and you'll get the required keys. – Freshen

Answer 12

In order to get all the keys available in redis server, you should open redis-cli and type: KEYS * In order to get more help please visit this page: This Link

Desmoid

Answer 13

If your redis is a cluster,you can use this script

#!/usr/bin/env bash
redis_list=("172.23.3.19:7001,172.23.3.19:7002,172.23.3.19:7003,172.23.3.19:7004,172.23.3.19:7005,172.23.3.19:7006")

arr=($(echo "$redis_list" | tr ',' '\n'))

for info in ${arr[@]}; do
  echo "start :${info}"
  redis_info=($(echo "$info" | tr ':' '\n'))
  ip=${redis_info[0]}
  port=${redis_info[1]}
  echo "ip="${ip}",port="${port}
  redis-cli -c -h $ip -p $port set laker$port '湖人总冠军'
  redis-cli -c -h $ip -p $port keys \*

done

echo "end"

Eckhardt

Answer 14

For the ones that wants a typescript helper (using ioredis)

import Redis from 'ioredis';
import { from, Observable, of } from 'rxjs';
import { first, mergeMap } from 'rxjs/operators';

export function scanKeysFromRedis(redisStore: Redis.Redis, key: string, 
target: number = 0, keys: string[] = []): Observable<string[]> {
  return from(redisStore.scan(target, 'MATCH', key)).pipe(
    first(),
    mergeMap((_keys) => {
      const _target = Number(_keys[0]);
      if (_target !== 0) {
        return scanKeysFromRedis(redisStore, key, _target, [...keys, ..._keys[1]]);
       }
      return of([...keys, ..._keys[1]]);
    }),
  );
}

and call it with: scanKeysFromRedis(store, 'hello');

Shantung

Answer 15

If you are using Laravel Framework then you can simply use this:

$allKeyList = Redis::KEYS("*");

print_r($allKeyList);

In Core PHP:

$redis = new Redis();

$redis->connect('hostname', 6379);

$allKeyList = $redis->keys('*');

print_r($allKeyList);

Tellurate

Answer 16

We should be using --scan --pattern with redis 2.8 and later.

You can try using this wrapper on top of redis-cli. https://github.com/VijayantSoni/redis-helper

Ulrich