- Usage:
-
BF.EXISTS key value
- Complexity:
- O(N), where N is the number of hash functions used by the bloom filter.
- Module:
- valkey-bloom
- Since module version:
- 1.0.0
-
0 - The item definitely does not exist since with bloom filters, false negatives are not possible.
-
1 - The item exists with a given false positive (
fp) percentage. There is anfprate % chance that the item does not exist. You can create bloom filters with a more strict false positive rate as needed. -
Integer reply:
1if the item exists in the bloom filter -
Integer reply:
0if the bloom filter does not exist or the item has not been added to the bloom filter
Determines if an item has been added to the bloom filter previously.
A bloom filter has two possible responses when you check if an item exists:
Examples
127.0.0.1:6379> BF.ADD key val
(integer) 1
127.0.0.1:6379> BF.EXISTS key val
(integer) 1
127.0.0.1:6379> BF.EXISTS key nonexistent
(integer) 0
RESP2/RESP3 Reply
One of the following: