Knut,
Upgrade is disabled in alpha and beta releases of Derby, but you
can enable it by setting the derby.database.allowPreReleaseUpgrade
property (java -Dderby.database.allowPreReleaseUpgrade=true ....).
If you set that property, your 10.1 database is booted in soft
upgrade mode, which means that the database will still work when
you go back to Derby 10.1.
If you set the property *and* add ";upgrade=true" to the connection
URL, the database will be upgraded to the 10.2 format. In that
case, the database cannot be booted with Derby 10.1 any more. And
if the database format is changed between the beta and the final
release, it might not even be bootable with Derby 10.2.
You should absolutely not upgrade a database to 10.2 beta unless
you have a backup!
Thank you for the warning.
Can I set the derby.database.allowPreReleaseUpgrade property in the
Derby properties file?
Stephen Caine
