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Redis · Command

PFCOUNT

PFCOUNT estimates the number of unique values in one or more HyperLogLog keys. With multiple keys, it estimates the size of their union.

Last updated

Since
2.8.9

Syntax

PFCOUNT key [key ...]

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  • PFADD
  • PFDEBUG
  • PFMERGE
  • PFSELFTEST

Source: PFCOUNT | Docs. Checked 2026-11-03.