![]() This hint is not available for SQL Server 7.0 Service Pack 2 (SP2) or earlier. It might be the answer for your issue but the symptoms suggest OPTIMIZE FOR UNKNOWN (same as local variables) may address the problem as well. Ive employed it to address parameter sniffing and optimize kitchen sink queries. If you want this option to affect multiple statements in a stored procedure, each statement must implement the hint that SQL Server is applying to a behavior. OPTION (RECOMPILE) is used in real word production scenarios. ![]() Note This query hint is applied on the statement level and does not affect the scope of the whole stored procedure. Select count(*) from #t where a = 37 option (keepfixed plan) In this query, the query does not cause the recompilation again: The most essential benefits of using stored procedures can be listed as follows: Performance: After the first execution of the stored procedure, the query optimizer creates an execution plan and this plan is stored in the query plan cache. assume SomeTable exists with the same definition as #t,įor the second execution of the RowModifications procedure, the following code causes the recompilation: A stored procedure is a ready T-SQL code that can be reused again and again. The KEEPFIXED PLAN query hint forces the query optimizer to never recompile a query because of changes in statistics or indexed column changes (for example, update, delete, or insert).įor additional information about how to troubleshoot stored procedure recompilation, click the following article number to view the article in the Microsoft Knowledge Base:Ģ43586 INF: Troubleshooting Stored Procedure Recompilation ![]() Therefore, the number of recompiles that are triggered during the execution of a stored procedure and the length of the stored procedure may sometimes increase the overall duration of the stored procedure execution.īeginning in SQL Server 7.0 SP3, a new query hint, KEEPFIXED PLAN, has been introduced to help in situations where the cost of recompilation is more than the cost of using the existing plan. Note that because SQL Server Service Pack 2 (SP2) and earlier do not support statement level recompilation, the whole stored procedure must be recompiled when a recompile is triggered. SUMMARY In some situations where stored procedures are recompiled, the cost of recompilation may outweigh the benefit that is derived from doing so. If the class has a namespace-qualified name that uses a period (. class_name must be a valid SQL Server identifier and must exist as a class in the assembly. ![]() An exception is for example if OPTION (RECOMPILE) is specified. This is valid for stored procedures, user defined functions and other. function Stored procedures and functions can be used to accomplish the same task. 1 In practice every query executed in SQL Server is compiled and the execution plan is cached. Introduction to stored procedure Stored procedure vs. NET Framework assembly for a CLR procedure to reference. Introduction to stored procedure Stored procedures in SQL Server can accept input parameters and return multiple values of output parameters 1. method_nameĪpplies to: SQL Server 2008 (10.0.x) and later, SQL Database. For information, see the Best Practices, General Remarks, and Limitations and Restrictions sections that follow. Recompiling an object is advantageous when 'indexes or other changes that affect statistics are made to the database, compiled stored procedures and triggers may lose efficiency. You can use the optional BEGIN and END keywords to enclose the statements. sprecompile is a system stored procedure in SQL Server 2008 R2, 2008, 20 that will recompile an object the next time it runs. One or more Transact-SQL statements comprising the body of the procedure. Transact-SQL syntax for stored procedures in SQL Server and Azure SQL Database: CREATE Jump to Simple Examples to skip the details of the syntax and get to a quick example of a basic stored procedure. CLR integration does not apply to Azure SQL Database. NET Framework CLR into SQL Server is discussed in this topic.
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