Fetch Large Datasets With Streams
Explore how to use Elixir's streams to fetch large datasets from databases efficiently. Understand lazy processing with Repo.stream, how to handle transactions, and ways to optimize performance while reducing memory usage. Gain skills to process data in chunks and improve concurrency in your applications.
We'll cover the following...
What are streams
Streams are a core part of Elixir. We use streams for:
- Lazy processing
- To avoid loading lots of data into memory at once
- For processing infinite data streams.
Many of Elixir’s concurrency constructs build on top of streams, such as the Task.async_stream function and the GenStage and Flow packages.
It’s essential to try to utilize concurrency when working with databases because much of the time spent during query execution is waiting for network I/O, during which the CPU is free to do other work.
We’ve used Repo.all to fetch data from the database ...