# lookback

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Available from dbt v1.9 or with the [dbt "Latest" release track](../../docs/dbt-versions/dbt-release-tracks.md).

## Definition

Configure a `lookback` window to reprocess additional batches during [microbatch incremental model](../../docs/build/incremental-microbatch.md) runs. It processes X batches up to the latest bookmark (the last successfully processed data point) to capture late-arriving records.

Set the `lookback` to an integer greater than or equal to zero. The default value is `1`. You can configure `lookback` for a [microbatch incremental model](../../docs/build/incremental-microbatch.md) in your project YAML file (`dbt_project.yml`), properties YAML file (`models/properties.yml`), or SQL file config.

## Examples

The following examples set `2` as the `lookback` config for the `user_sessions` model.

Example in the `dbt_project.yml` file:

dbt\_project.yml

```yml
models:
  my_project:
    user_sessions:
      +lookback: 2
```

Example in a property file:

models/properties.yml

```yml
models:
  - name: user_sessions
    config:
      lookback: 2
```

Example in SQL config block:

models/user\_sessions.sql

```sql
{{ config(
    lookback=2
) }}
```

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