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

# ETL: Vertica Snapshot CDC Source

> How to configure the Vertica Snapshot CDC source component to read changed records from Vertica in your Integrate.io ETL pipeline.

Use the Vertica (Snapshot CDC) source component to read only the records that have changed in your Vertica tables since the previous pipeline run, instead of reprocessing the entire table every time. The component produces two outputs: **Upserted records** (new and updated rows) and **Deleted records** (rows removed from the source).

## Connection Setup

Configure your Vertica connection in Integrate.io, then add the **Vertica (Snapshot CDC)** source component to your pipeline and select that connection. See the [Snapshot CDC Source reference](/etl/using-components-cdc-database-source) for full configuration details.

## Snapshot Storage

Vertica Snapshot CDC uses **File Based** snapshot storage. The snapshot of your previous run is stored as a Parquet file on Integrate.io managed cloud storage, which means:

* Only read access to your Vertica database is required.
* No snapshot tables are created in your source database.
* On the first run, every current record is treated as upserted because there is no previous snapshot to compare against.

<Note>
  Database (table-based) snapshot storage is only available for SQL Server connections. For Vertica, File Based storage is the only option, and you do not need to configure an S3 connection of your own.
</Note>

## Change Detection

Choose how the component decides whether a row has changed:

* **Primary Key**: matches rows by a unique identifier column and detects updates by comparing the remaining column values. Best when the table has a reliable key.
* **Composite Hash**: builds a hash from all or selected columns and compares hashes between runs. Best when the table has no reliable primary key.

With File Based storage you can also switch the **Source Mode** from **Table** to **Query** to track changes across a custom SQL query, including JOINs across multiple tables.

## Full Configuration Reference

<Card title="Snapshot CDC Source reference" icon="book" href="/etl/using-components-cdc-database-source" horizontal>
  Configuration steps, change detection methods, query mode, best practices, troubleshooting, and limitations that apply to every Snapshot CDC source.
</Card>