Re: Optimize multiple writes on the same row
To answer your last question, we have lots of inserts in the first weeks of the life cycle, then mainly updates. There are no deletes. I would say that we have 1000s of inserts/updates per second (I don't have the real numbers right now).
The real problem is that a lot of simultaneous queries are updating the exact same data in the database. As this data is locked every time it's written to, the queries can't be executed simultaneously: they have to wait for each other to update the sum. That have a huge impact on the performance.
I'm not familiar with the triggers, but I don't think it will prevent this problem, but maybe I just don't understand how they work.
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