How to: Redis flushall

Redis is an open-source in-memory data structure store that is used as a database, cache, and message broker. It is widely used for its high-performance, scalability, and flexibility. Redis flushall is one of the most important commands in Redis, which can be used to delete all the keys in the current database.

In this tutorial, we will discuss the Redis flushall command, its usage, and related concepts.

What is Redis flushall?

Redis flushall is a Redis command that is used to delete all the keys in the current database. This command is used to clear the entire database and remove all the data stored in it. The flushall command is a powerful command and should be used with caution as it can delete all the data in the database.

Redis flushall Syntax

The syntax for Redis flushall command is as follows:

FLUSHALL

Redis flushall Usage

To use Redis flushall command, open the Redis CLI and type the following command:

redis> FLUSHALL

This command will delete all the keys in the current database.

Redis flushall Example

Let’s take a look at an example to better understand how Redis flushall works.

redis> SET name John
OK
redis> SET age 25
OK
redis> KEYS *
1) "name"
2) "age"
redis> FLUSHALL
OK
redis> KEYS *
(empty list or set)

In the above example, we have set two keys, “name” and “age” with their respective values. We have then used the KEYS command to list all the keys in the database. After that, we have used the FLUSHALL command to delete all the keys in the database. Finally, we have used the KEYS command again to list all the keys in the database, which is now empty.

Redis flushdb

Redis flushdb is another Redis command that is used to delete all the keys in the current database. The difference between Redis flushall and flushdb is that flushall deletes all the keys in all the databases, whereas flushdb deletes all the keys in the current database only.

Redis SELECT

Redis SELECT command is used to select the database with the specified index. Redis supports multiple databases, and each database is identified by a number from 0 to 15. By default, Redis connects to database 0. To select a different database, you can use the SELECT command.

redis> SELECT 1
OK

In the above example, we have used the SELECT command to select database 1.

Conclusion

Redis flushall is a powerful command that is used to delete all the keys in the current database. It is important to use this command with caution as it can delete all the data in the database. In this tutorial, we have discussed the syntax and usage of Redis flushall command, and related concepts like Redis flushdb and Redis SELECT. By following the examples and concepts discussed in this tutorial, you can easily use Redis flushall command in your applications.