Retrieving SQL Server Query Execution Plans: A Comprehensive Guide
This guide outlines several methods for obtaining SQL Server query execution plans, each suited to different situations.
Method 1: Leveraging SQL Server Management Studio (SSMS)
SSMS offers a user-friendly approach. Simply enable the "Include Actual Execution Plan" option before executing your query or stored procedure. This generates a visual representation of the execution plan.
Method 2: Utilizing SHOWPLAN Options
Employ the following SHOWPLAN options before running your query:
-
SET SHOWPLAN_TEXT ON: Provides an estimated plan without actual query execution. -
SET SHOWPLAN_ALL ON: Displays an estimated plan with cost estimations. -
SET SHOWPLAN_XML ON: Generates an XML-formatted estimated plan. -
SET STATISTICS PROFILE ON: Outputs the actual plan in text format. -
SET STATISTICS XML ON(Recommended): Outputs the actual plan in XML format.
These commands append the execution plan as an additional result set to your query's output.
Method 3: Employing SQL Server Profiler
SQL Server Profiler allows you to create a trace that captures "Showplan XML" events. Execute your query while the trace is active; the execution plan can then be extracted from the captured event data. This is particularly useful for analyzing slow-running queries.
Method 4: Inspecting the Query Cache
Utilize SQL Server Dynamic Management Views (DMVs), such as sys.dm_exec_cached_plans, to examine the query cache for existing execution plans. Note that this method provides estimated plans.
Key Considerations:
- Always retrieve the plan from the database experiencing performance issues.
- Execution plans cannot be captured for encrypted stored procedures.
- Actual execution plans offer more detailed information and statistics compared to estimated plans.
Further Reading:
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