---
acl_categories:
- '@tdigest'
- '@read'
arguments:
- name: key
  type: key
categories:
- docs
- develop
- stack
- oss
- rs
- rc
- oss
- kubernetes
- clients
complexity: O(1)
description: Returns information and statistics about a t-digest sketch
group: tdigest
hidden: false
linkTitle: TDIGEST.INFO
module: Bloom
railroad_diagram: /images/railroad/tdigest.info.svg
since: 2.4.0
stack_path: docs/data-types/probabilistic
summary: Returns information and statistics about a t-digest sketch
syntax_fmt: TDIGEST.INFO key
title: TDIGEST.INFO
---
Returns information and statistics about a t-digest sketch.

## Required arguments

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

is the key name for an existing t-digest sketch.
</details>

## Examples

{{< highlight bash >}}
redis> TDIGEST.CREATE t
OK
redis> TDIGEST.ADD t 1 2 3 4 5
OK
redis> TDIGEST.INFO t
 1) Compression
 2) (integer) 100
 3) Capacity
 4) (integer) 610
 5) Merged nodes
 6) (integer) 0
 7) Unmerged nodes
 8) (integer) 5
 9) Merged weight
10) (integer) 0
11) Unmerged weight
12) (integer) 5
13) Observations
14) (integer) 5
15) Total compressions
16) (integer) 0
17) Memory usage
18) (integer) 9768
{{< / highlight >}}

## Redis Software and Redis Cloud compatibility

| Redis<br />Software | Redis<br />Cloud | <span style="min-width: 9em; display: table-cell">Notes</span> |
|:----------------------|:-----------------|:------|
| <span title="Supported">&#x2705; Supported</span><br /> | <span title="Supported">&#x2705; Flexible & Annual</span><br /><span title="Supported">&#x2705; Free & Fixed</nobr></span> |  |

## Return information

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

One of the following:

* [Array reply]({{< relref "/develop/reference/protocol-spec#arrays" >}}) with information about the given sketch as name-value pairs:

    | Name<br>[Simple string reply]({{< relref "/develop/reference/protocol-spec#simple-strings" >}}) | Description
    | ---------------------------- | -
    | `Compression`        | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> The compression (controllable trade-off between accuracy and memory consumption) of the sketch 
    | `Capacity`           | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Size of the buffer used for storing the centroids and for the incoming unmerged observations
    | `Merged nodes`       | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Number of merged observations
    | `Unmerged nodes`     | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Number of buffered nodes (uncompressed observations)
    | `Merged weight`      | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Weight of values of the merged nodes
    | `Unmerged weight`    | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Weight of values of the unmerged nodes (uncompressed observations)
    | `Observations`       | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Number of observations added to the sketch
    | `Total compressions` | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Number of times this sketch compressed data together
    | `Memory usage`       | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Number of bytes allocated for the sketch
* [Simple error reply]({{< relref "/develop/reference/protocol-spec#simple-errors" >}}) in these cases: the given key does not exist or is of an incorrect type or an incorrect number of arguments.

-tab-sep-

One of the following:

* [Map reply]({{< relref "/develop/reference/protocol-spec#maps" >}}) with information about the given sketch as name-value pairs:

    | Name<br>[Simple string reply]({{< relref "/develop/reference/protocol-spec#simple-strings" >}}) | Description
    | ---------------------------- | -
    | `Compression`        | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> The compression (controllable trade-off between accuracy and memory consumption) of the sketch 
    | `Capacity`           | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Size of the buffer used for storing the centroids and for the incoming unmerged observations
    | `Merged nodes`       | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Number of merged observations
    | `Unmerged nodes`     | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Number of buffered nodes (uncompressed observations)
    | `Merged weight`      | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Weight of values of the merged nodes
    | `Unmerged weight`    | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Weight of values of the unmerged nodes (uncompressed observations)
    | `Observations`       | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Number of observations added to the sketch
    | `Total compressions` | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Number of times this sketch compressed data together
    | `Memory usage`       | [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}})<br> Number of bytes allocated for the sketch
* [Simple error reply]({{< relref "/develop/reference/protocol-spec#simple-errors" >}}) in these cases: the given key does not exist or is of an incorrect type or an incorrect number of arguments.

{{< /multitabs >}}