XLEN command in Redis is specifically used for streams. It gives the length of a stream, i.e., the total number of items present in the given stream.
This is useful when you want to:
Here's an example of how to use
XLEN in Ruby with the
In the above example, we first connect to the Redis server running on localhost at port 6379. We then add a single entry to the stream named "mystream". After that, we retrieve the length of the stream using
xlen and print it. In this case, it will output
1, as there's only one item in the stream.
XLEN. If the stream does not exist, Redis interprets it as an empty stream and returns 0.
XLENwill return the memory size of the stream. It only returns the number of items in the stream, not their combined size in bytes.
Q: What does
XLEN return if the stream doesn't exist?
A: If you call
XLEN on a non-existent stream, Redis assumes it's an empty stream and returns 0.