Return the number of messages in a stream.
XLEN
key
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 Valkey 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.
O(1)
@fast @read @stream
127.0.0.1:6379> XADD mystream * item 1
"1714701492011-0"
127.0.0.1:6379> XADD mystream * item 2
"1714701492021-0"
127.0.0.1:6379> XADD mystream * item 3
"1714701492031-0"
127.0.0.1:6379> XLEN mystream
(integer) 3
XACK, XADD, XAUTOCLAIM, XCLAIM, XDEL, XGROUP, XGROUP CREATE, XGROUP CREATECONSUMER, XGROUP DELCONSUMER, XGROUP DESTROY, XGROUP HELP, XGROUP SETID, XINFO, XINFO CONSUMERS, XINFO GROUPS, XINFO HELP, XINFO STREAM, XPENDING, XRANGE, XREAD, XREADGROUP, XREVRANGE, XSETID, XTRIM.