Contents
How to display an actual execution plan in SQL?
Enter the query for which you would like to display the actual execution plan. On the Query menu, click Include Actual Execution Plan or click the Include Actual Execution Plan toolbar button. Execute the query by clicking the Execute toolbar button.
What happens if a query does not have a plan?
If any query does not have plan or plan is too big to fit in the cache, it will display the value NULL. I hope you find this query helpful. The actual execution plan retrieved from this query is not complete but it still displays quite a lots of interesting details.
When do you get an actual execution plan?
Actual execution plans are generated after the Transact-SQL queries or batches execute. Because of this, an actual execution plan contains runtime information, such as actual resource usage metrics and runtime warnings (if any).
How to zoom in on an execution plan?
Select an operator to view its properties. You can alter the display of the execution plan by right-clicking the execution plan and selecting Zoom In, Zoom Out, Custom Zoom, or Zoom to Fit. Zoom In and Zoom Out allow you to zoom in or out on the execution plan, while Custom Zoom allows you to define your own zoom, such as zooming at 80 percent.
How to view execution plan data in DB2?
DB2 uses multiple approaches to generate and display execution plans. You use SQL to place plan data into a table, after which you can view the data by several means. These are the primary methods that IBM itself describes in its documentation:
Where are explain instances stored in db2-tf?
db2 -tf EXPLAIN.DDL. DB2’s plan tables contain a hierarchy of data about each execution plan stored, with EXPLAIN_INSTANCE at the top of the hierarchy with one row per execution plan. When you delete an EXPLAIN_INSTANCE row, the delete cascades to remove details for that execution plan from the other tables as well.
How to check execution statistics of SQL query?
Using ApexSQL Plan, SQL Execution plan analysis tool, you can check the execution statistics of the query, such as the number of reads, the duration and the CPU cost, that are high for that query, as shown below:
How does the SQL profiler show the query plan?
Displays the query-plan with full compile-time details (including costing estimates and column lists) of the SQL statement being executed. When the Showplan All event class is included in a trace, the BinaryData data column must be selected. If it is not, information for this event class will not be displayed in the trace.
What is showplan all for query compile in SQL Server?
Include the Showplan All for Query Compile event class to identify the Showplan operators on SQL Server 2000 or SQL Server 7.0. This event class will also work on SQL Server 2005 or later, however the information included is a subset of the information available in Showplan XML For Query Compile.
When to run a server side trace using profiler?
When troubleshooting a performance problem, the first tool of choice is to either run a server side trace or a trace using Profiler.