Redis Pfcount Command

Redis HyperLogLog

The Redis Pfcount command returns the estimated base value of the given HyperLogLog.

Syntax

Basic Syntax of Redis Pfcount Command:

redis 127.0.0.1:6379> PFCOUNT key [key ...]

Available Versions

>= 2.8.9

Return Value

Integer, returns the base value of the given HyperLogLog, or the sum of base estimates if multiple HyperLogLogs are given.

Online Examples

redis 127.0.0.1:6379> PFADD hll foo bar zap
(integer) 1
redis 127.0.0.1:6379> PFADD hll zap zap zap
(integer) 0
redis 127.0.0.1:6379> PFADD hll foo bar
(integer) 0
redis 127.0.0.1:6379> PFCOUNT hll
(integer) 3
redis 127.0.0.1:6379> PFADD some-other-hll 1 2 3
(integer) 1
redis 127.0.0.1:6379> PFCOUNT hll some-other-hll
(integer) 6
redis> 

Redis HyperLogLog