If your writes are fast, doing them serially does not cause anyone to wait.
How often does the typical user write to the DB? Often it is like once per day or so (for example on hacker news). Say the write takes 1/1000s. Then you can serve
1000 * 60 * 60 * 24 = 86 million users
And nobody has to wait longer than a second when they hit the "reply" button, as I do now ...
If your writes are fast, doing them serially does not cause anyone to wait.
How often does the typical user write to the DB? Often it is like once per day or so (for example on hacker news). Say the write takes 1/1000s. Then you can serve
And nobody has to wait longer than a second when they hit the "reply" button, as I do now ...