BF.CARD

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

<details open><summary><code>key</code></summary>

is key name for a Bloom filter.

</details>

Examples

{{< highlight bash >}} redis> BF.ADD bf1 item_foo (integer) 1 redis> BF.CARD bf1 (integer) 1 redis> BF.CARD bf_new (integer) 0 {{< / highlight >}}

Redis Software and Redis Cloud compatibility

| Redis Software | Redis Cloud | <span style="min-width: 9em; display: table-cell">Notes</span> | |:----------------------|:-----------------|:------| | <span title="Supported">✅ Supported</span> | <span title="Supported"><nobr>✅ Flexible & Annual</nobr></span> <span title="Supported">✅ Free & Fixed</nobr></span> | |

Return information

{{< multitabs id="bf-card-return-info" tab1="RESP2" tab2="RESP3" >}}

One of the following:

• [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}}): 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]({{< relref "/develop/reference/protocol-spec#simple-errors" >}}) 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.

-tab-sep-

One of the following:

• [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}}): 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]({{< relref "/develop/reference/protocol-spec#simple-errors" >}}) 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. {{< /multitabs >}}