DB Server: Maintenance tasks

1. Must have
+Full DB backup: daily, should be scheduled in off hours
+Verify DB backup: daily, after full back up, to make sure DB can restore ok
+Check db integrity: daily, should be scheduled in off hours
+Transaction log backups: every 15 minutes
+Maintenance cleanup: daily
+Update statistics: daily

2. Should have
+Shrink tempdb: daily, should do with max capacity of your disk space
+Rebuild index: weekly, be careful, should check with SQL Server Profiler tool to make sure new indexes be effective or worse

Ref:
http://www.sql-server-pro.com/dbcc-checkdb.html
http://msdn.microsoft.com/en-us/library/ms176064.aspx