vb net 2d barcode generator Script to obtain information about your batch from sys.dm_exec_query_optimizer_info in .NET framework

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Listing 2-2. Script to obtain information about your batch from sys.dm_exec_query_optimizer_info
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SET NOCOUNT ON; USE Northwind; -- use your database name here DBCC FREEPROCCACHE; -- empty the procedure cache GO -- we will use tempdb..OptStats table to capture -- the information from several executions -- of sys.dm_exec_query_optimizer_info IF (OBJECT_ID('tempdb..OptStats') IS NOT NULL) DROP TABLE tempdb..OptStats; GO -- the purpose of this statement is -- to create the temporary table tempdb..OptStats SELECT 0 AS Run, * INTO tempdb..OptStats FROM sys.dm_exec_query_optimizer_info; GO -- this will populate the procedure cache -- with this statement's plan so that it will not -- generate any optimizer events when executed -- next time -- the following GO is intentional to ensure -- the query plan reuse will happen for the following -- INSERT for its next invocation in this script GO INSERT INTO tempdb..OptStats SELECT 1 AS Run, * FROM sys.dm_exec_query_optimizer_info; GO -- same reason as above; observe the "2" replaced "1" -- therefore, we will have a different plan GO INSERT INTO tempdb..OptStats SELECT 2 AS Run, * FROM sys.dm_exec_query_optimizer_info; GO -- empty the temporary table
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TRUNCATE TABLE tempdb..OptStats GO -- store the "before run" information -- in the temporary table with the output -- of sys.dm_exec_query_optimizer_info -- with value "1" in the column Run GO INSERT INTO tempdb..OptStats SELECT 1 AS Run, * FROM sys.dm_exec_query_optimizer_info; GO -- your statement or batch is executed here /*** the following is an example SELECT C.CustomerID, COUNT(O.OrderID) AS NumOrders FROM dbo.Customers AS C LEFT OUTER JOIN dbo.Orders AS O ON C.CustomerID = O.CustomerID WHERE C.City = 'London' GROUP BY C.CustomerID HAVING COUNT(O.OrderID) > 5 ORDER BY NumOrders; ***/ GO -- store the "after run" information -- in the temporary table with the output -- of sys.dm_exec_query_optimizer_info -- with value "2" in the column Run GO INSERT INTO tempdb..OptStats SELECT 2 AS Run, * FROM sys.dm_exec_query_optimizer_info; GO -- extract all "events" that changed either -- the Occurrence or Value column value between -- the Runs 1 and 2 from the temporary table. -- Display the values of Occurrence and Value -- for all such events before (Run1Occurrence and -- Run1Value) and after (Run2Occurrence and -- Run2Value) executing your batch or query. -- This is the result set generated by the script. WITH X (Run,Counter, Occurrence, Value) AS ( SELECT * FROM tempdb..OptStats WHERE Run=1 ), Y (Run,Counter, Occurrence, Value) AS ( SELECT * FROM tempdb..OptStats WHERE Run=2 ) SELECT X.Counter, Y.Occurrence-X.Occurrence AS Occurrence, CASE (Y.Occurrence-X.Occurrence) WHEN 0 THEN (Y.Value*Y.Occurrence-X.Value*X.Occurrence)
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ELSE (Y.Value*Y.Occurrence-X.Value*X.Occurrence)/(Y.Occurrence-X.Occurrence) END AS Value FROM X JOIN Y ON (X.Counter=Y.Counter AND (X.Occurrence<>Y.Occurrence OR X.Value<>Y.Value)); GO -- drop the temporary table DROP TABLE tempdb..OptStats; GO
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If we use the preceding script to investigate the compiler events and the corresponding counters and values for the statement from Listing 2-1 , after we run the script with the statement embedded in the marked place (-- your statement or batch is executed here), we will see the result of the statement itself followed by Table 2-2 . From the counters, we see that SQL Server optimized the batch consisting of a single statement 0.008752 seconds, the cost of the final plan is 0.023881, the DOP is 0 (which means serial plan), a single optimization has been executed, only Phase 1 (same as "search 1") of optimization has been exercised using 647 search tasks in 0.00721 seconds (the "search" is almost always the most expensive part of the query compilation), and the query has 2 tables. If the batch consists of multiple statements, the Value column in Table 2-2 would contain average values of the counters and statistics. Elapsed time 1 0.008752 Final cost 1 0.023881 Maximum DOP 1 0 Optimizations 1 1 search 1 1 1 search 1 tasks 1 647
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