ChatGPT has transformed the way businesses look at AI to support their functions. It has started showing its power by automating customer support and improving customer experience. dbt (data build tool) is just like that.
You can create your own transformations with dbt using SQL SELECT statements. As a result, anyone without substantial training in other programming languages can perform data transformation. Wouldn’t that make your professional life easy?
I will walk you through the details on how to use dbt redshift including the setup and loading of data. You will also understand the main use cases of dbt redshift. Alright! Ready to dive into the pool of dbt-redshift?
How to Get Started with dbt and Redshift
In this section, I will introduce you to the three steps to start using dbt redshift. The steps are:
- Setting up a Redshift cluster
- Loading data into your Redshift account
- Connecting dbt Cloud and Redshift
Let’s begin dbt Redshift setup by logging into your AWS account and configuring Redshift.
We will now add our test data to the S3 bucket that was created by our Cloudformation template. A cheap and convenient alternative to Redshift for storing data is S3 buckets.
- The data used in this course is kept in a public S3 bucket as CSV files. To download these files, enter one of the following URLs. To utilize them in the subsequent steps, download these to your computer.
- Select the name of the bucket as S3 bucket. If you have more than one S3 bucket, this will be the bucket that was listed under Workshopbucket on the Outputs page. The bucket will be prefixed with dbt-data-lake.
- Select Upload, and add the three files to the UI.
- The name of the S3 bucket you need to save looks like s3://dbt-data-lake-xxxx. You will need it for the next section.
- Select your cluster, enter Redshift in the search bar, and then click Query data.
- Execute the following query in your query editor to build the schemas that will house your raw data. To execute each one separately, highlight the statement, then select Run. You might have to enter them separately into the user interface if you are using the Classic Query Editor. These schemas should be accessible under dbtworkshop.
create schema if not exists jaffle_shop;
create schema if not exists stripe;
- Use the following statements to build the tables in your schema after running these queries. These will be added to the corresponding schemas as tables.
create table jaffle_shop.customers(
create table jaffle_shop.orders(
_etl_loaded_at timestamp default current_timestamp
create table stripe.payment(
_batched_at timestamp default current_timestamp
- We must copy the data from S3. Update the region, iam role, and S3 location as necessary. The S3 and iam roles can be found in your Cloudformation stack outputs.
copy jaffle_shop.customers( id, first_name, last_name)
copy jaffle_shop.orders(id, user_id, order_date, status)
copy stripe.payment(id, orderid, paymentmethod, status, amount, created)
- Confirm that you can use the following code snippets to execute a select * from each of the tables.
select * from jaffle_shop.customers;
select * from jaffle_shop.orders;
select * from stripe.payment;
Now, you have loaded training data into a Redshift instance. In the next section, we will go over the procedures to link dbt Cloud and Redshift.
Let’s begin this part by setting up a dbt Cloud account.
- Go to dbt Cloud.
- Create a new dbt Cloud account and send yourself an email to confirm it if you don’t already have one.
- You can start a new project from your existing dbt Cloud account if you already have one:
- Projects can be accessed by clicking the gear symbol at the top right.
- Press “+ New Project.” “Setup a New Project” page will appear.
- In the dbt Project Name column, enter Analytics. Later, you will have the option of renaming this project.
- Then click Next.
Next, let’s configure the connection between dbt Cloud and Redshift.
- Select Redshift to set up your connection.
- Write Redshift or another short title for the name.
- Enter the settings for Redshift. Use the credentials you saved from the CloudFormation template as a reference.
- The whole hostname is your hostname. Be careful to remove any leading slashes at the end and the http:// at the beginning. 5439 is the port.
- It uses the dbtworkshop database.
- Set your credentials for development. The dbt Cloud will connect to Redshift using these credentials. These credentials will be (according to your CloudFormation output):
- Username: dbtadmin
- Password: the one you chose previously in the instruction manual
- Schema: You’ll see that a name for your schema was automatically generated for you. This is typically written as dbt first-initial>last-name>. When using the Cloud IDE to run dbt, your models will be created in this schema, which is directly connected to your development environment.
- Towards the bottom, select Test Connection. This demonstrates that your Redshift cluster can be accessed via dbt Cloud.
- Click Next if the connection test is successful. You might need to double-check your Redshift settings and credentials if it doesn’t work.
Now, you can Initialize your repository and start development using Redshift dbt.
- Use Git to version control your code when developing on dbt Cloud.
- You can set up a managed repository hosted by dbt Cloud. Or, connect directly to a supported git provider to connect to a repository.
- An excellent approach to test out dbt without having to set up a new repository is through managed repositories.
- To leverage capabilities like automation and continuous integration, it is ultimately preferable to connect to a supported git provider.
To create a managed repository:
- Choose Managed under Add repository from.
- Name your repository something like bbaggins-dbt-quickstart.
- Select Create. The creation and importation of your repository will take a short while.
- Click Continue when you see Successfully imported repository.
You can now create your project and begin work on dbt Redshift after setting up a repository:
- Select Develop in the upper left corner. Your project may spin up slowly the first time since it needs to establish a git connection, clone your repository, and test the warehouse connection.
- Click Initialize your project to the left of the file tree. This creates a folder structure for you using example models.
- Click on Commit to make your initial commitment. Use the first commit’s commit message. By doing this, you can open a branch to add new dbt code. Create the first commit to your managed repository.
- You should now be able to run dbt run and directly query data from your warehouse. In the IDE, paste the warehouse-specific code that follows:
select * from `dbt-tutorial.jaffle_shop.customers`
- In the command line bar at the bottom, type dbt run and click Enter. We will explore what happens in the next section of the tutorial.
And, that’s it. Next, let’s understand some use cases of dbt with Redshift.
Use Cases of dbt Redshift
To Create a Data Lakehouse with dbt Redshift
Having a lot of crucial SQL business logic stuffed into one or two SQL files is one of the worst forms of technical debt you might experience. Additionally, there is no way to validate the reports that these files produce on a regular basis with each new bucket of data.
There are times when you only want to send new data into the data lake. This could be for saving money on replicating your complete database every day. The raw JSON blob transformation is still under source control. Also, since it is fragile and challenging to test, this source transformation won’t take place until the data reached Redshift.
Let’s look into the steps to implement this transformation using dbt Redshift:
- You should keep Redshift, but use ELT (Extract, Load, Transform) instead of ETL (Extract, Load, Transform).
- This may be done by building Kinesis Firehoses that direct our DynamoDB and Kinesis streams’ raw data into their respective Redshift tables. Create other tables using the dbt converted data after that.
- A Lambda function that is connected to each of the Firehoses extracts the primary keys from the data blobs. It adds a timestamp for when they were handled. By choosing this use case, you can significantly reduce your monthly AWS spending.
To Chart Upgrades, Downgrades, New Revenue, and Net Churn
This use case of dbt Redshift is applicable when you need to chart anything. It entails using dbt and Mode Analytics to store and analyze data directly in Amazon Redshift. You can combine these numbers once the important parameters of new revenue, churned revenue, upgrades, and downgrades are taken into account.
The configuration you’ll need to obtain precise and comprehensive data and create great charts with it is as follows:
- An AWS Redshift database to keep all of your data.
- Tools like Hevo Data to synchronize data from Stripe (or your invoicing platform) to Redshift.
- Dbt to organize the unstructured, unprocessed data that is synced from Stripe into Redshift into clean database “views” you can query to produce attractive displays.
- Sinter to keep your charts up to date by scheduling dbt queries to run every day (or more frequently).
- Mode analytics to query the clean database views are fetched by dbt to produce stunning charts.
To Provide Efficient QuickSight Reports
- This use case of dbt Redshift supports you to deliver effective QuickSight reports. So, Redshift is used as a data warehouse to combine data from external sources such as Microsoft Dynamics 365, AWS Pinpoint, and AWS DynamoDB.
- After the data has been ingested into Redshift, use dbt to convert it into a format that AWS QuickSight can easily read.
- Each report or visualization in QuickSight has a fact table. You can efficiently query the necessary data using this method.
With this section, we have come to the end of dbt Redshift. Let’s recall the key pointers.
dbt redshift enables data engineers to transform data and create dashboard views. To start using dbt Redshift, you need to set up a Redshift cluster. Then, load data into your Redshift account and connect dbt cloud and Redshift. You can create a Data Lakehouse by connecting dbt redshift.
That’s just one of the many use cases offered by this integration. Other use case is presenting chart upgrades, downgrades, new revenue and net churn. dbt redshift is also helpful to provide efficient QuickSight reports.
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