Performance impact of "upgrade=true"

[Jose de Castro]

I'd like the ability to simply drop in a new version of Derby without  
having to change possibly hundreds of data source files. Is there any  
reason why I shouldn't make "upgrade=true" part of my standard JDBC  
connection URL? How does it affect the boot time? Is there any  
ongoing performance impact aside from boot time?

Thanks in advance,
Jose de Castro
Sr. Software Engineer
Voxeo Corporation
http://www.voxeo.com