When using a MySQL backend (Version 14.14 Distrib 5.5.29 for debian-linux-gnu (x86_64)), I got the following error at database creation:
Failed to install index for persistence.PDNamespace model: (1170, "BLOB/TEXT column 'uri' used in key specification without a key length")
Failed to install index for persistence.PDRecord model: (1170, "BLOB/TEXT column 'rec_id' used in key specification without a key length")
There is a related question on SO :
I recently changed some fields from fixed-length text to unlimited-length to fix the bug where literals with length longer than 255 (8a19fa8).
I can't look at the links above as StackOverflow is offline at the moment. I'll look into this at a later time.
BTW, PostgreSQL does not have this problem.
Sorry, the prov.persistence subpackage is no longer supported.