{
  "id": "probabilistic",
  "title": "Probabilistic data structures configuration object",
  "url": "https://redis.io/docs/latest/operate/rs/references/rest-api/objects/bdb/probabilistic/",
  "summary": "Configuration object for probabilistic data structures",
  "tags": [
    "docs",
    "operate",
    "rs"
  ],
  "last_updated": "2026-04-01T08:10:08-05:00",
  "page_type": "content",
  "content_hash": "f7dfc135a4beb3a2b2861f630af9769049d0107aed714670d4e74f8c7b8a8491",
  "sections": [
    {
      "id": "content",
      "title": "Content",
      "role": "content",
      "text": "Configuration fields for probabilistic data structures.\n\n| Field | Type/Value | Description |\n|-------|------------|-------------|\n| bf-error-rate | number (range: 0-1) (default: 0.01) | Error ratio for new Bloom filters. These defaults are applied to each new Bloom filter upon its creation. |\n| bf-initial-size | integer (range: 1-1048576) (default: 100) | Initial capacity for new Bloom filters. These defaults are applied to each new Bloom filter upon its creation. |\n| bf-expansion-factor | integer (range: 0-32768) (default: 2) | Expansion factor for new Bloom filters. These defaults are applied to each new Bloom filter upon its creation. |\n| cf-initial-size | integer (range: 1-1048576) (default: 1024) | Initial capacity for new Cuckoo filters. These defaults are applied to each new Cuckoo filter upon its creation. |\n| cf-bucket-size | integer (range: 1-255) (default: 2) | Number of items in each bucket for new Cuckoo filters. These defaults are applied to each new Cuckoo filter upon its creation. |\n| cf-max-iterations | integer (range: 1-65535) (default: 20) | Maximum iterations for new Cuckoo filters. These defaults are applied to each new Cuckoo filter upon its creation. |\n| cf-expansion-factor | integer (range: 0-32768) (default: 1) | Expansion factor for new Cuckoo filters. These defaults are applied to each new Cuckoo filter upon its creation. |\n| cf-max-expansions | integer (range: 1-65536) (default: 32) | Maximum expansions for new Cuckoo filters. These defaults are applied to each new Cuckoo filter upon its creation. |"
    }
  ],
  "examples": []
}