> ## Documentation Index
> Fetch the complete documentation index at: https://docs.risingwave.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sink data from RisingWave to Google Cloud Storage

> This guide describes how to sink data from RisingWave to Google Cloud Storage sink using GCS connector in RisingWave.

[Google Cloud Storage](https://cloud.google.com/storage/docs) is a RESTful online file storage web service for storing and accessing data on Google Cloud Platform infrastructure.

## Syntax

```sql theme={null}
CREATE SINK [ IF NOT EXISTS ] sink_name
[FROM sink_from | AS select_query]
WITH (
   connector='gcs',
   connector_parameter = 'value', ...
);
```

## Parameters

| Parameter names      | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| -------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| connector            | **Required**. Support the GCS connector only.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| gcs.bucket\_name     | **Required**. The name of the bucket where the sink data is stored in.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| gcs.credential       | **Required**. Base64-encoded credential key obtained from the GCS service account key JSON file. To get this JSON file, refer to the [guides of GCS documentation](https://cloud.google.com/iam/docs/keys-create-delete#iam-service-account-keys-create-console). <ul><li>To encode it in base64, run the following command: <code>cat \~/Downloads/rwc-byoc-test-464bdd851bce.json \| base64 -b 0 \| pbcopy</code>, and then paste the output as the value for this parameter.</li><li>If this field is not specified, ADC (application default credentials) will be used.</li></ul> |
| gcs.service\_account | **Optional**. The service account of the GCS sink. If `gcs.credential` or ADC is not specified, the credentials will be derived from the service account.                                                                                                                                                                                                                                                                                                                                                                                                                             |
| gcs.path             | **Required**. The directory where the sink file is located.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| type                 | **Required**. Defines the type of the sink. The GCS sink only supports `append-only`.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |

## Example

```sql theme={null}
CREATE SINK gcs_sink AS SELECT v1
FROM t1
WITH (
    connector='gcs',
    gcs.path = '<test_path>',
    gcs.bucket_name = '<bucket_name>',
    gcs.credential = '<account_name>',
    gcs.service_account = '<service_account>'
    type = 'append-only',
)FORMAT PLAIN ENCODE PARQUET(force_append_only=true);
```

## Advanced topics

For more information about encode `Parquet` or `JSON`, see [Sink data in parquet or json format](/delivery/overview#sink-data-in-parquet-or-json-format).

For more information about batching strategy, see [Batching strategy for file sink](/delivery/overview#batching-strategy-for-file-sink).