Safe Mode is an attempt to solve the shared-server security problem. It is architecturally incorrect to
try to solve this problem at the PHP level, but since the alternatives at the web server and OS levels
aren’t very realistic, many people, especially ISP’s, use safe mode for now.
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The name of a directory has to comply with the same rules as those applied on regular file names. One of the most important restrictions is that you can’t have two files with the same name in one directory (but keep in mind that Linux is, like UNIX, a case sensitive operating system).
We have identified at least two kinds of users of our cluster: those that need (i.e., take advantage of) permanent local processing power and disk space in conjunction with the cluster to speed up processing, and those that just need only the cluster processing power.
Normalised data is for sissies
Keep multiple copies of data around
Makes searching faster
Have to ensure consistency in the application logic