Our database server has a maintenance plan which runs each night:
- Back up databases & logs (10-20GB max)
- Check Database Integrity
- Rebuild Indexes
- Update Statistics
Normally this all executes in under a minute per database. However, in the last month there have been two instances where it just froze the database for 3 hours. The DBCC statement took 2 hours to complete, but completed with no errors. This whole time our database was rejecting connections.
Aside from these two isolated incidents, this database has never given a single problem.
Could anyone suggest what may cause such a problem?