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XLEN

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스트림의 엔트리(ID) 개수 리턴

사용법은 XLEN key입니다.

Example

명령>	XLEN sensor-1234
결과>	(integer) 2

	해당 키가 존재하지 않는 경우에도 0을 리턴합니다. 그러므로 키 존재여부는 EXISTS 명령으로 확인해야 합니다.

명령문

XLEN key

이 명령은 version 5.0.0 부터 사용할 수 있다.
논리적 처리 소요시간은 O(log(1))이다.

<< XADD	XLEN	XRANGE >>

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