Commandsslen
SLEN
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Redis Regular Inspection / Technical Support
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Redis Enterprise Server
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Return the number of members in a key
Usage is slen key. Same as SCARD.
List uses LLEN, Hash uses HLEN, and Stream uses XLEN, while Set and ZSet use CARD.
SLEN and ZLEN were added so they are easier to remember without confusion.
Example
| Command> | sadd myset "member_1" "member_2" |
| Result> | 2 |
| Command> | sadd myset "member_3" "member_4" |
| Result> | 2 |
| Command> | slen myset |
| Result> | 4 |
Syntax
SLEN key
- Available since Enterprise version 7.
- Time complexity is O(1).
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