# ARINFO

```json metadata
{
  "title": "ARINFO",
  "description": "Returns metadata about an array.",
  "categories": ["docs","develop","stack","oss","rs","rc","oss","kubernetes","clients"],
  "arguments": [{"key_spec_index":0,"name":"key","type":"key"},{"name":"full","optional":true,"token":"FULL","type":"pure-token"}],
  "syntax_fmt": "ARINFO key [FULL]",
  "complexity": "O(1), or O(N) with FULL option where N is the number of slices.",
  "group": "array",
  "command_flags": ["READONLY"],
  "acl_categories": ["ARRAY"],
  "since": "8.8.0",
  "arity": -2,
  "key_specs": [{"begin_search":{"index":{"pos":1}},"find_keys":{"range":{"lastkey":0,"limit":0,"step":1}},"flags":["RO","ACCESS"]}],
  "tableOfContents": {"sections":[{"id":"required-arguments","title":"Required arguments"},{"id":"optional-arguments","title":"Optional arguments"},{"id":"examples","title":"Examples"},{"id":"return-information","title":"Return information"}]}

,
  "codeExamples": []
}
```Returns metadata about an array.

## Required arguments

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

The name of the key that holds the array.

</details>

## Optional arguments

<details open><summary><code>FULL</code></summary>

When present, includes per-slice statistics in the reply: the number of dense and sparse slices and their average sizes and fill rates. Raises the complexity from O(1) to O(N) where N is the number of slices.

</details>

## Examples


ARMSET myarray 0 "a" 1 "b" 100 "c"
ARINSERT myarray "d"
ARINFO myarray


## Return information

**RESP2:**

[Array reply](../../develop/reference/protocol-spec#arrays)

**RESP3:**

[Map reply](../../develop/reference/protocol-spec#maps)