XLEN key

Available since 5.0.0.

Time complexity: O(1)

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.

*Return value

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

*Examples

redis> XADD mystream * item 1 

  1. "1576238528302-0"

redis> XADD mystream * item 2 

  1. "1576238528303-0"

redis> XADD mystream * item 3 

  1. "1576238528304-0"

redis> XLEN mystream 

  1. (integer) 3
redis>