Page History
...
A table, Customers, exists in SQL Server 2012. It has no Indexes.
|
| 1. Table Structure |
Before Tuning - Query Execution Plan
|
|
| ||
| 2. Query with a simple WHERE clause | 3. Query Cost displayed in an Execution Plan | 4. Table Scan in a Visual Explain Diagram |
From Aqua Data Studio's Visual Explain Tool, you can find out that the Optimizer uses a full table scan while the query
...
After Tuning - Introducing an Index
|
|
| ||
| 5. CREATE UNIQUE INDEX statement executed | 6. Reduced query Cost displayed in an Execution Plan | 7. Index Scan in a Visual Explain Diagram |
Table scan versus index scan
...