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add reference to piscina #916

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add reference to piscina #916

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2 changes: 2 additions & 0 deletions docs/threads.md
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For most applications, `better-sqlite3` is fast enough to use in the main thread without blocking for a noticeable amount of time. However, if you need to perform very slow queries, you have the option of using [worker threads](https://nodejs.org/api/worker_threads.html) to keep things running smoothly. Below is an example of using a thread pool to perform queries in the background.

NOTE: The example below is nice for simple use cases, but if you're going to do anything much more complex, then you may want to look into a proper worker library like [piscina](https://github.com/piscinajs/piscina).

### worker.js

The worker logic is very simple in our case. It accepts messages from the master thread, executes each message's SQL (with any given parameters), and sends back the query results.
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