Contents
How do I get an execution plan in Sybase?
Obtaining an Execution Plan
- Open a SQL file or procedural object in its corresponding editor.
- In the source for SQL file or procedural object, select the statement or statements for which you want to display an execution plan.
- Right-click and select Get Execution Plan.
How do I view a Sqlplan File?
In SQL Server Management Studio, on the File menu, choose Open, and then click File. In the Open File dialog box, set Files of type to Execution Plan Files (*. sqlplan) to produce a filtered list of saved XML query plan files. Select the XML query plan file that you want to view, and click Open.
How is an operator in a query plan not a step?
An operator in a query plan is not a step (where the full result set of a previous step is evaluated by the next one. SQL Server uses a pipelined execution model, where each operator exposes methods like Init (), GetRow (), and Close ().
How to check execution plan in SQL Server?
Checking the SQL execution plan generated after executing that query, you will see that the SQL Server Engine will retrieve the rows from the table, then sort these values based on the columns specified in the GROUP BY clause and aggregate these values using the fastest aggregation method, which is the Stream Aggregate Operator.
What happens when a query includes top n?
I would have guessed that when a query includes TOP n the database engine would run the query ignoring the the TOP clause, and then at the end just shrink that result set down to the n number of rows that was requested. The graphical execution plan seems to indicate this is the case — TOP is the “last” step. But it appears there is more going on.
How are operators classified in the showplan statement?
You can view the query plan by using the SET SHOWPLAN statements, the graphical execution plan options in SQL Server Management Studio, or the SQL Server Profiler Showplan event classes. Operators are classified as logical and physical operators.