XLEN

XLEN key

Available since

5.0.0

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 Redict 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.

Examples #

XADD mystream * item 1
XADD mystream * item 2
XADD mystream * item 3
XLEN mystream