Dr. Steven Park: What Everyone Should Know About MoldDuring a major stressful event, your cortisol levels (your stress hormone) and your sympathetic nervous system increases greatly, but once the stressful event is over, your hormonal and nervous system responses return back to normal levels. Actually, with the immune system, as it drops back to normal levels, it dips below normal for a short period of time before going back to normal levels. This may be one explanation why people get sick only after a major stressful event.
But if you have multiple small stressful events throughout the day, you don’t have time to recover, and your baseline stress levels remain constantly elevated.
If you add to this any form of sleep deprivation, than you’ll be adding to this chronic stress state even more. (Sic)
Foursquare and MongoDB: What IfRDBMSes are known quantities - they are easy to scale to certain points. Judging by the amount of data that Foursquare reports to have, they aren’t likely to reach the point where an RDBMS can no longer scale for a very long time. The downside to this approach is that an RDBMS is much costlier per TB of storage (up to ten times more expensive) than using MongoDB, but if your business is your data, then it’s important to keep the data safe.