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Loading Data from to AlloyDB using dlt in Python


We will be using the dlt PostgreSQL destination to connect to AlloyDB. You can get the connection string for AlloyDB from the GCP AlloyDB Console.

Need help deploying these pipelines, or figuring out how to run them in your data stack?

Join our Slack community or book a call with our support engineer Violetta. is an online platform that offers services for chess enthusiasts, including online chess games, tournaments, and lessons. AlloyDB for PostgreSQL is a fully managed, PostgreSQL-compatible database service designed for demanding workloads, including hybrid transactional and analytical processing. It pairs a Google-built database engine with a cloud-based, multi-node architecture to deliver enterprise-grade performance, reliability, and availability. This documentation provides instructions on loading data from to AlloyDB using the open-source Python library dlt. For more information about, visit their website.

dlt Key Features

  • Governance Support: dlt pipelines offer robust governance through metadata utilization, schema enforcement, and schema change alerts. Read more
  • Data Extraction: Efficiently extract data using iterators, chunking, and parallelization. Learn more
  • Data Types: Supports various data types including text, double, bool, timestamp, and more. Explore data types
  • Authentication Types: Snowflake destination supports password, key pair, and external authentication. Details here
  • Scalability and Fine-tuning: Offers mechanisms to run extraction, normalization, and load in parallel, and fine-tune memory buffers and file sizes. Read more

Getting started with your pipeline locally

0. Prerequisites

dlt requires Python 3.8 or higher. Additionally, you need to have the pip package manager installed, and we recommend using a virtual environment to manage your dependencies. You can learn more about preparing your computer for dlt in our installation reference.

1. Install dlt

First you need to install the dlt library with the correct extras for AlloyDB:

pip install "dlt[postgres]"

The dlt cli has a useful command to get you started with any combination of source and destination. For this example, we want to load data from to AlloyDB. You can run the following commands to create a starting point for loading data from to AlloyDB:

# create a new directory
mkdir chess_pipeline
cd chess_pipeline
# initialize a new pipeline with your source and destination
dlt init chess postgres
# install the required dependencies
pip install -r requirements.txt

The last command will install the required dependencies for your pipeline. The dependencies are listed in the requirements.txt:


You now have the following folder structure in your project:

├── .dlt/
│ ├── config.toml # configs for your pipeline
│ └── secrets.toml # secrets for your pipeline
├── chess/ # folder with source specific files
│ └── ...
├── # your main pipeline script
├── requirements.txt # dependencies for your pipeline
└── .gitignore # ignore files for git (not required)

2. Configuring your source and destination credentials

The dlt cli will have created a .dlt directory in your project folder. This directory contains a config.toml file and a secrets.toml file that you can use to configure your pipeline. The automatically created version of these files look like this:

generated config.toml

# put your configuration values here

log_level="WARNING" # the system log level of dlt
# use the dlthub_telemetry setting to enable/disable anonymous usage data reporting, see
dlthub_telemetry = true

config_int = 0 # please set me up!

generated secrets.toml

# put your secret values and credentials here. do not share this file and do not push it to github

secret_str = "secret_str" # please set me up!

[sources.chess.secret_dict] # please set me up!
key = "value"

dataset_name = "dataset_name" # please set me up!

database = "database" # please set me up!
password = "password" # please set me up!
username = "username" # please set me up!
host = "host" # please set me up!
port = 5432
connect_timeout = 15

2.1. Adjust the generated code to your usecase

Further help setting up your source and destinations
  • Read more about setting up the source in our docs.
  • Read more about setting up the AlloyDB destination in our docs.

3. Running your pipeline for the first time

The dlt cli has also created a main pipeline script for you at, as well as a folder chess that contains additional python files for your source. These files are your local copies which you can modify to fit your needs. In some cases you may find that you only need to do small changes to your pipelines or add some configurations, in other cases these files can serve as a working starting point for your code, but will need to be adjusted to do what you need them to do.

The main pipeline script will look something like this:

import dlt
from chess import source

def load_players_games_example(start_month: str, end_month: str) -> None:
"""Constructs a pipeline that will load chess games of specific players for a range of months."""

# configure the pipeline: provide the destination and dataset name to which the data should go
pipeline = dlt.pipeline(
# create the data source by providing a list of players and start/end month in YYYY/MM format
data = source(
["magnuscarlsen", "vincentkeymer", "dommarajugukesh", "rpragchess"],
# load the "players_games" and "players_profiles" out of all the possible resources
info ="players_games", "players_profiles"))

def load_players_online_status() -> None:
"""Constructs a pipeline that will append online status of selected players"""

pipeline = dlt.pipeline(
data = source(["magnuscarlsen", "vincentkeymer", "dommarajugukesh", "rpragchess"])
info ="players_online_status"))

def load_players_games_incrementally() -> None:
"""Pipeline will not load the same game archive twice"""
# loads games for 11.2022
load_players_games_example("2022/11", "2022/11")
# second load skips games for 11.2022 but will load for 12.2022
load_players_games_example("2022/11", "2022/12")

if __name__ == "__main__":
# run our main example
load_players_games_example("2022/11", "2022/12")

Provided you have set up your credentials, you can run your pipeline like a regular python script with the following command:


4. Inspecting your load result

You can now inspect the state of your pipeline with the dlt cli:

dlt pipeline chess_pipeline info

You can also use streamlit to inspect the contents of your AlloyDB destination for this:

# install streamlit
pip install streamlit
# run the streamlit app for your pipeline with the dlt cli:
dlt pipeline chess_pipeline show

5. Next steps to get your pipeline running in production

One of the beauties of dlt is, that we are just a plain Python library, so you can run your pipeline in any environment that supports Python >= 3.8. We have a couple of helpers and guides in our docs to get you there:

The Deploy section will show you how to deploy your pipeline to

The running in production section will teach you about:

  • How to Monitor your pipeline: Learn how to effectively monitor your dlt pipeline in production to ensure smooth operation and quickly identify any issues. How to Monitor your pipeline
  • Set up alerts: Set up alerts to get notified about any critical events or issues in your dlt pipeline, ensuring you can take timely action. Set up alerts
  • And set up tracing: Implement tracing to gain detailed insights into the performance and behavior of your dlt pipeline, helping you to optimize and troubleshoot effectively. And set up tracing

Available Sources and Resources

For this verified source the following sources and resources are available

Source chess

The source provides data on player profiles, online statuses, and historical game details.

Resource NameWrite DispositionDescription
players_gamesappendThis resource retrieves players' games that happened between a specified start and end month. It includes various details like accuracy, ratings, results, time control, tournament details, etc. for both the black and white players in each game.
players_online_statusappendThis resource checks the current online status of multiple chess players. It retrieves their username, status, last login date, and check time.
players_profilesreplaceThis resource retrieves player profiles for a list of player usernames. It includes details like the player's avatar, country, followers, streaming status, join date, last online time, league, location, name, player ID, status, title, URL, username, and verification status.

Additional pipeline guides

This demo works on codespaces. Codespaces is a development environment available for free to anyone with a Github account. You'll be asked to fork the demo repository and from there the README guides you with further steps.
The demo uses the Continue VSCode extension.

Off to codespaces!


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