CMS.INITBYPROB key error probability

Available in: Redis Stack

Time complexity: O(1)

Initializes a Count-Min Sketch to accommodate requested tolerances.


  • key: The name of the sketch.
  • error: Estimate size of error. The error is a percent of total counted items. This effects the width of the sketch.
  • probability: The desired probability for inflated count. This should be a decimal value between 0 and 1. This effects the depth of the sketch. For example, for a desired false positive rate of 0.1% (1 in 1000), error_rate should be set to 0.001. The closer this number is to zero, the greater the memory consumption per item and the more CPU usage per operation.


[] otherwise.


redis> CMS.INITBYPROB test 0.001 0.01