Our application uses hibernate3 with MSSQL 2005 server platform. Hibernate configured to update DB structure on startup (hibernate.hbm2ddl.auto property to update). Since last week a problem raised that application starts very slow. Also if to check DB there are no all the necessary indexes which should be created by hibernate. If to set hibernate.hbm2ddl.auto to validate application starts fast but it is not a solution such as we often change data structure (application is in development). DBCC CHECKDB for the database gives no warnings. Also hibernate doesn't report any errors. If to restore previous database version of one week ago the problem disappears. But we have a lot of new data since that date entered and don't want to loose it. How to find the cause of so strange behaviour? What can be corrupted in the DB that doesn't allow to create all the indexes.