# CF.LOADCHUNK












Restores a cuckoo filter previously saved using [`CF.SCANDUMP`](https://redis.io/docs/latestcommands/cf.scandump/).

See the [`CF.SCANDUMP`](https://redis.io/docs/latestcommands/cf.scandump/) command for example usage.

<note><b>Notes</b>

- This command overwrites the cuckoo filter stored under `key`.
- Make sure that the cuckoo filter is not changed between invocations.

</note>

## Required arguments

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

is key name for a cuckoo filter to restore.
</details>

<details open><summary><code>iterator</code></summary>

Iterator value associated with `data` (returned by [`CF.SCANDUMP`](https://redis.io/docs/latestcommands/cf.scandump/))
</details>

<details open><summary><code>data</code></summary>

Current data chunk (returned by [`CF.SCANDUMP`](https://redis.io/docs/latestcommands/cf.scandump/))
</details>

## Return value

Returns one of these replies:

- [Simple string reply](https://redis.io/docs/latest/develop/reference/protocol-spec#simple-strings) - `OK` if executed correctly
- [] on error (invalid arguments, wrong key type, wrong data, etc.)

## Examples

See [`CF.SCANDUMP`](https://redis.io/docs/latestcommands/cf.scandump/) for an example.

## Return information

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

One of the following:
* [Simple string reply](https://redis.io/docs/latest/develop/reference/protocol-spec#simple-strings): `OK` if executed correctly.
* [Simple error reply](https://redis.io/docs/latest/develop/reference/protocol-spec#simple-errors) in these cases: invalid arguments, wrong key type, or when invalid data was passed.

-tab-sep-

One of the following:
* [Simple string reply](https://redis.io/docs/latest/develop/reference/protocol-spec#simple-strings): `OK` if executed correctly.
* [Simple error reply](https://redis.io/docs/latest/develop/reference/protocol-spec#simple-errors) in these cases: invalid arguments, wrong key type, or when invalid data was passed.