How do you import data from SQL Server into BigQuery?

October 02, 2023

Tags: Technologies

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Cloud computing is one of the most popular technical solutions right now, and one tool stands out: Google Cloud Platform. GCP, which was created by the technology giant, provides numerous alternatives for managing information and data from the cloud, including BigQuery.


Because BigQuery is a data warehouse similar to Microsoft SQL Server, numerous firms have elected to migrate their data from the Microsoft-managed warehouse to the Google-managed warehouse, but how can this be accomplished?





How to Load SQL Server Data into BigQuery


You can load data from SQL Server to BigQuery by following these general steps:


Data from SQL Server can be exported


First, you must export the data from SQL Server to a format that BigQuery can read. CSV, JSON, Avro, Parquet, and ORC are examples of popular formats. To export data, you can utilize SQL Server's built-in export tools or develop custom scripts.


Prepare data for import


Make sure the data you're exporting is in the right format and structure for BigQuery. This may entail changing the data, cleaning it, and verifying that the data types are compatible.


Make a BigQuery dataset


To save your data in BigQuery, you must first establish a dataset. A data set is a container for tables.


Upload data to Google Cloud Storage (optional)


If your data is too huge to upload straight to BigQuery, you can first upload it to Google Cloud Storage (GCS). GCS is a Google cloud storage service. BigQuery can load data from GCS, making it easier to manage massive data volumes.




Data should be loaded into BigQuery


Load the data into your BigQuery dataset using the online UI, command-line tools, or API. Here's how to accomplish it with the web interface:


  • Navigate to the BigQuery console
  • Choose a project and a data set.
  • Select "Create Table" or choose "Create Table from File."
  • Select your data source (for example, GCS or a local file) and set the format and structure as directed.
  • Begin the data import procedure.


The mapping of schemas


Check that the schema of the data you're importing matches the schema of the BigQuery destination table. If the columns have different names or data types, you may need to manually assign them.


Optionally define upload options


BigQuery allows you to customize how data is loaded by setting delimiting characters for CSV files, handling duplicate rows, and more. You can customize these settings based on the qualities of your data.


Begin the import


When you begin the import procedure, BigQuery will load the data into your dataset. During the import, you can track the progress and look for mistakes.


Examine facts and seek advice


After loading the data, you may examine it in BigQuery and run SQL queries to evaluate it.


Optional data update schedule


You can build up a scheduled data refresh process, such as utilizing Dataflow or other ETL (Extract, Transform, Load) technologies to automate data transfers, if you need to keep BigQuery data up to date.


Remember that, depending on your individual use case and requirements, Google Cloud provides a variety of tools and services that can help to streamline this process, including Dataflow, Transfer Service, and Cloud Storage. Additionally, check that you have access to your SQL Server and BigQuery installations and that you have the relevant permissions.




What exactly is BigQuery?


It is worthwhile to check the definition provided by Google in its official BigQuery documentation. "BigQuery is a fully managed enterprise data warehouse that helps you manage and analyze your data with built-in features like machine learning, geospatial analytics, and business intelligence," according to the company. BigQuery's serverless architecture enables you to use SQL queries to address your organization's most pressing problems without having to maintain infrastructure. The scalable, distributed analytics engine in BigQuery allows you to query terabytes in seconds and petabytes in minutes."


"BigQuery maximizes flexibility by separating the computing engine that analyzes your data from its storage options," they continue. You can use BigQuery to store and analyze your data, or you can use it to determine where your data is stored. Federated queries allow you to read data from external sources, whereas streaming allows you to update data in real time. You may analyze and comprehend the data with powerful tools like BigQuery ML and BI Engine."


We have cloud computing experts at Rootstack who can easily integrate BigQuery with your project. Trust our experience with over 200 pleased customers around the world.


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