XDEL command is used in Redis' stream data type to delete a message from the stream. This might be useful if you have an application that processes messages asynchronously and wants to remove certain processed or irrelevant messages.
Let's consider a simple example where we add some messages to a stream and then remove one of them.
In this example, we first create a new connection to the Redis server. Then, we add two messages into 'mystream'. The
xadd method returns the ID of the added message, which we store in
message_id. We then use
xdel with the stream name and this ID to delete the specific message from the stream.
XDEL. It permanently removes messages from a stream. Make sure to only apply it to messages that are no longer needed.
Q: Can I use wildcards with XDEL to delete multiple messages?
No, wildcards are not supported with
XDEL. However, you can delete multiple messages by passing multiple message IDs.
Q: What happens when I try to delete a non-existent message?
XDEL will not return an error. It will just return 0 as the number of deleted entries.