What are the areas impact query to run for ever/long?

Hi All,
When I have to talk about long running scripts or procedures I focus on DTA which suggests on Indexing and infact I think this is the main cause. What are the other areas which we need to consider for Long running queries and troubleshooting tools we need
to use do you think?
Ofcourse blocking impacts but am purely thinking at query perspective.
Thanks
Swapna

What are the other areas which we need to consider for Long running queries and troubleshooting tools we need to use do you think?
One of the reasons is blocking. Please take a look at these links:
INF: Understanding and resolving SQL Server blocking problems
Troubleshoot Slow-Running Queries In SQL Server
T-SQL Articles
T-SQL e-book by TechNet Wiki Community
T-SQL blog

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