The transaction log for database xxxxxxxx is full
The following messages are issued during library operations:
The transaction log for database <Library> is full. To find out why space in the log cannot be reused, see the log_reuse_wait_desc column in syst.databases
Every time any activity is carried out, UPK writes this to a log file that can then be used for rollback/commit, etc. This log has become full.
Either increase the size of the log file, or take more regular backups (whcih will reset the log).