---
title: split_chunk() | Tiger Data Docs
description: Split a large chunk at a specific point in time.
---

Since [2.18.0](https://github.com/timescale/timescaledb/releases/tag/2.18.0)

Split a large chunk at a specific point in time. If you do not specify the timestamp to split at, the chunk is split equally.

## Samples

- Split a chunk at a specific time:

  ```
  CALL split_chunk('chunk_1', split_at => '2025-03-01 00:00');
  ```

- Split a chunk in two:

  For example, If the chunk duration is, 24 hours, the following command splits `chunk_1` into two chunks of 12 hours each.

  ```
  CALL split_chunk('chunk_1');
  ```

## Arguments

The syntax is:

```
CALL split_chunk(
    chunk = '<chunk_name>',
    split_at = <split_point>
);
```

| Name       | Type     | Default | Required | Description                                                                                                                                                                 |
| ---------- | -------- | ------- | -------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `chunk`    | REGCLASS | -       | ✔        | Name of the chunk to split.                                                                                                                                                 |
| `split_at` | ”any”    | `NULL`  | ✖        | The point at which to split the chunk. Accepts TIMESTAMPTZ for time-based dimensions or INTEGER for integer-based dimensions. If not specified, the chunk is split in half. |

## Returns

This function returns void.