Issue:
When running the 6.4.x installer to upgrade from 6.3.x, the process has bee stuck at the "Checking databases" step for a considerable amount of time.
Solution:
The Checking "databases" step is actually modifying the contents of any hSQL databases that exist on the server. UW ships with some default hSQL databases for demo purposes, such as the database for Audit Services, and sometimes the features that use them are not swiched over to using MySQL or MSSQL.
The issue is that the databases, especially the Audit database can become extremely large, and thus it takes a considerable amount of time for the modifications to be made. It is most commonly the Audit database that causes this issue.
There are two options available when this issue occurs.