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 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.

Examples

redis> XADD mystream * item 1
(integer) 11
redis> XADD mystream * item 2
(integer) 6
redis> XADD mystream * item 3
1) (integer) 8
2) (integer) 9
3) (integer) 10
redis> XADD mystream * item 1
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> XADD mystream * item 2
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> XADD mystream * item 3
Cannot destructure property 'error' of 'replies[i]' as it is undefined.
redis> XLEN mystream
Cannot destructure property 'error' of 'replies[i]' as it is undefined.

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