1. Performance Enhancing T-SQL Queries and Stored Procedures
Iwan de Beer

2.  Analysing Queries
 Filtering Results
 Batching Operations
 Performance Killers

3.  sp_lock shows which tables are being locked
 sp_who tells you which statements are currently
running
 The Profiler identifies long running queries
 Query Execution Plans pinpoint bottle-necks

4.  Ensure your queries have WHERE clauses
 Select as little data as possible into Temporary
Tables
 Avoid SELECT * - return subsets of columns

5.  Avoid Cursors
 Perform operations in Batches
 Use Temporary Tables

6.  Slow Triggers impact on insert, update, and/or
delete statements
 Missing / Inappropriate Indexes slows down
SELECT statements

7.  http://www.mssqlcity.com/Tips/tipTSQL.htm
 http://www.sql-server-performance.com/tips/all_main.aspx
 http://www.codeproject.com/KB/database/sqldodont.aspx