> Another good reason for per-database directories under the tablespace is > to prevent directories from containing too many files.
Actually, I would take that as an reason not to have database directories. If the number of files becomes a concern, we would need some kind of a hashing algorithm to disperse them appropriately. The database directory would just get in the way without really adding anything. Is 1000 per files as a directory limit still the rule of thumb for a limit? A single TB sized db would start to run into those types of limits.
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