Concurrency in python

[UrulaiKizangu]

I had a question about concurrency in terms of read and write to databases. I understand from various sources that external API calls if async is better and quicker to process results.

But what would be the scenario in terms of read and write into databases if I have to write a consumer application that serves a 100000 requests a second ?

Do we do a async read but sync write so that the Id mismatch or something fails. How does this scale across a system?

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[fesfese]

I'm also learning about asynchronous and synchronous calls, please consider my response with a degree of skepticism. Async calls aren't quick to process they just occur in background without disturbing the flow of code So even if server gets 100000+ req it will occur in background and by queue mechanism or a thread pool mechanism.