Join Joey D'Antoni for an in-depth discussion in this video How to read an execution plan, part of SQL Server Performance for Developers.
- [Instructor] Let's talk about reading…execution plans.…As you learned, execution plans are generated…every time you run a query, or at least each query…that you run has its own execution plan.…It may be cached, it may be generated at run time.…But we want to learn how to read…those execution plans because they're really key…to driving performance in SQL Server…and understanding what your code is doing…and how it's working.…So there are two types of execution plans…that exist in SQL Server and that you can see…through Management Studio and other related tools.…
And these are estimated plans and actual plans.…And what's the difference between these plans…in terms of what we have in terms of data and information?…Well, the key thing about an estimated plan is that…you can generate an estimated plan…without actually running the query.…So you don't have to wait for the results to take place.…The optimizer will simply compile the query…and generate an execution plan.…However, the actual plan has more data included…
- Query execution
- How to read an execution plan
- What not to do with SQL Server
- Why cursors are bad
- Why scalar UDFs are expensive
- Datatypes and design
- What is a columnstore index?
- Transaction isolation
Skill Level Intermediate
1. Query Execution
2. What Not to Do with SQL Server
3. Datatypes and Design
4. Temporary Objects
7. Isolation Levels
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