How do you determine an acceptable response time for DB requests?

Posted by qiq on Stack Overflow See other posts from Stack Overflow or by qiq
Published on 2010-04-08T18:42:19Z Indexed on 2010/04/08 18:43 UTC
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Filed under:

google-app-engine

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database

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response-time

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latency

According to this discussion of Google App Engine on Hacker News,

A DB (read) request takes over 100ms on the datastore. That's insane and unusable for about 90% of applications.

How do you determine what is an acceptable response time for a DB read request?

I have been using App Engine without noticing any issues with DB responsiveness. But, on the other hand, I'm not sure I would even know what to look for in that regard :)

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