If these values represent the typical ones with which the procedure is called subsequently, then the stored procedure benefits from the query plan each time it compiles and executes. If we know that a statement returns a varying amount of data (based on the parameters supplied) then we can use the SQL Server 2005 feature WITH RECOMPILE to tell SQL Server that the statement being executed should have it’s own plan created and that prior plans (if they exist) should not reuse the statement. Alternatively, if you just executed a query and chose to display its execution plan, move to the Execution Plan tab in the results pane. When SQL Server executes stored procedures, any parameter values used by the procedure when it compiles are included as part of generating the query plan. Open a previously saved query execution plan file (.sqlplan) using the File menu and clicking on Open File, or drag a plan file to Management Studio window. In this situation, it can be useful to force the stored procedure to recompile the next time it executesĪnother reason to force a stored procedure to recompile is to counteract, when necessary, the "parameter sniffing" behavior of stored procedure compilation. Syntax of EXEC command in SQL Server Following is the basic syntax of EXEC command in SQL Server. You can also use full command EXECUTE which is the same as EXEC. But if a new index is added from which the stored procedure might benefit, optimization does not happen until the next time the stored procedure is run after Microsoft SQL Server is restarted. Al crear o modificar un 'procedimiento almacenado' en SQL Server, puede agregar la opcin WITH RECOMPILE, pero la mayora de los documentos o libros se escriben en trminos ambiguos, o solo se interpretan como 'cada vez que se ejecuta este procedimiento almacenado, se debe volver a compilar'. The EXEC command is used to execute a stored procedure, or a SQL string passed to it. It also occurs if an underlying table used by the stored procedure changes. Your requirement is like asking how to define a query where the FROM is defined before the SELECT. This optimization happens automatically the first time a stored procedure is run after Microsoft SQL Server is restarted. As per the syntax documentation the WITH clause, and the procedure options (with includes RECOMPILE ), goes before the AS. CREATE PROCEDURE dbo. When a procedure is compiled for the first time or recompiled, the procedure's query plan is optimized. "As a database is changed by such actions as adding indexes or changing data in indexed columns, the original query plans used to access its tables should be optimized again by recompiling them. Recompile a Stored Procedure Before You Begin.
0 Comments
Leave a Reply. |