1. Turn on the execution plan, and statistics
2. Use Clustered Indexes
3. Use Indexed Views
4. Use Covering Indexes
5. Keep your clustered index small.
6. Avoid cursors
7. Archive old data
8. Partition your data correctly
9. Remove user-defined inline scalar functions
10. Use APPLY
11. Use computed columns
12. Use the correct transaction isolation level
A well written article to jog the memory when writing TSQL >
http://tonesdotnetblog.wordpress.com/2008/05/26/twelve-tips-for-optimising-sql-server-2005-queries/
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