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XLEN key

Time complexity: O(1)

ACL categories: @read, @stream, @fast

Returns the number of entries inside a stream. If the specified key does not exist the command returns zero, as if the stream was empty. However note that unlike other Redis types, zero-length streams are possible, so you should call TYPE or EXISTS in order to check if a key exists or not.

Streams are not auto-deleted once they have no entries inside (for instance after an XDEL call), because the stream may have consumer groups associated with it.


Integer reply: the number of entries of the stream at key.


dragonfly> XADD mystream * item 1
dragonfly> XADD mystream * item 2
dragonfly> XADD mystream * item 3
dragonfly> XLEN mystream
(integer) 3