Hi Brett? What's the underlying storage system like? In particular, is it an SSD storage system? Is there any chance that you happened to hit a spot in time where there was some non-Derby event which was causing the storage system to misbehave?
I understand that certain SSD implementations, and certain file systems, have to perform automatic maintenance activity on the SSD media, such as "wear leveling", which can impose significant overhead on the file system and cause normal use of the file system to be VERY slow for a significant period. Here's a relatively old article on the subject; you might try some web searching to see if you can get more recent information. http://www.computerworld.com/article/2524589/data-center/analysis--ssd-performance----is-a-slowdown-inevitable-.html Anyway, I guess what I'm suggesting is that you consider investigating whether a non-Derby external factor is at work on the machine which is suffering the performance problems. thanks, bryan
