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Redis DUMP all keys – How to view cached data

Do you want to know more about the Redis DUMP all keys option?

In Redis caching servers, the DUMP command serializes the Redis key-value and returns it to the user.

At Bobcares, we often receive queries regarding the Redis server as part of our Server Management Services.

Today, let’s have a deep look at how our Support Engineers use this command efficiently.

 

More about Redis

Before discussing more on the DUMP command, let us have a look at Redis.

Redis is a server that stores data. And, it primarily works as a key-value store, that can function as a database, cache and a message broker.

Also, it is non-relational. So, at its simplest level, Redis has been configured as basic key/value pairs.

Websites use the Redis caching server to speed up the websites. Here, the frequently accessed data will be sent from the cache.

However, it can be tricky to track the errors that exist in the Redis database.

 

How to easily DUMP all keys in Redis?

As we have already said, Redis data is mainly stored as key/value pair.

Recently, one of our customers wanted to examine the Redis keys. Let’s see how our Support Engineers did this for our customers.

Redis uses the SET and GET commands to store and retrieve information. We retrieved all the existing keys using the command,

KEYS *

For instance, we used the command as below,

127.0.0.1:6379> keys *
1) "mykey"
2) "key"
3) "test"
4) "key1"

Similarly, to get the type of the key, we use the below command,

TYPE key_name

Usually, the Redis DUMP command serializes the value in the key and returns it to the user. Moreover, this serialization format is non-standard and opaque. The result contains a 64-bit checksum that helps to detect errors.

Also, this serialized value contains an RDB version encoded within it. And, this prevents the Redis versions with incompatible RDB formats to process the serialized value.

redis dump all keys

But, if the given key does not exist, then it will return a nil bulk reply.

Also, the serialized value doesn’t show the expire information. Therefore, we use the PTTL command to get the time to live of the key.

 

[Need more assistance with this Redis command?- We’re here to help you.]

 

Conclusion

In today’s article, we saw how our Support Engineers easily DUMP all keys in Redis to get their serialized value.


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