BF.CARD 

BF.CARD key
Available in:
Redis Open Source / Bloom 2.4.4
Time complexity:
O(1)
ACL categories:
@bloom, @read, @fast,
Compatibility:
Redis Software and Redis Cloud compatibility

Returns the cardinality of a Bloom filter - number of items that were added to a Bloom filter and detected as unique (items that caused at least one bit to be set in at least one sub-filter)

(since RedisBloom 2.4.4)

Required arguments

key

is key name for a Bloom filter.

Examples 

redis> BF.ADD bf1 item_foo
(integer) 1
redis> BF.CARD bf1
(integer) 1
redis> BF.CARD bf_new
(integer) 0

Redis Software and Redis Cloud compatibility

Redis
Software		 Redis
Cloud		 Notes
✅ Supported
 ✅ Flexible & Annual
✅ Free & Fixed

Return information

One of the following:

  • Integer reply: the number of items detected as unique that were added to the Bloom filter (items that caused at least one bit to be set in at least one sub-filter), or 0 when the given key does not exist.
  • Simple error reply in these cases: invalid arguments, wrong key type, or when the filter is full.

Note: when key exists, BF.CARD returns the same value as BF.INFO key ITEMS.

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