Join Joey D'Antoni for an in-depth discussion in this video Overview of nonclustered indexes, part of SQL Server Performance for Developers.
- [Instructor] The next topic in indexing…is going to be nonclustered indexes.…So, we've talked about how clustered indexes make up…all the pages of the table stored in the order of the key.…Nonclustered indexes are really what I like to think of…as supplemental indexes for how we query our data.…For example, you're typically going to want to add…a nonclustered index to the column…that's in your WHERE clause…and your most commonly run queries.…And this is where it helps to have an understanding…of the pattern of your application and how it's used.…You want to know most of the queries…that your application is usually running,…and this is where using things like stored procedures…can be beneficial over Dynamic SQL…or letting users craft ad hoc SQL,…because it's extremely difficult to divine a pattern…from users ad hoc querying your database…as opposed to you having program code…or even stored procedures that are accessed…through reports that query your database…in a predictable fashion.…
When your database querying is predictable,…
- 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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