XLEN

Syntax

1. XLEN key

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

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

Examples

1. dragonfly> XADD mystream * item 1
2. "1676903940326-0"
3. dragonfly> XADD mystream * item 2
4. "1676903940327-0"
5. dragonfly> XADD mystream * item 3
6. "1676903940327-1"
7. dragonfly> XLEN mystream
8. (integer) 3