With recompile sql3/2/2023 ![]() Or if a plan does exist due to prior caching, it is not affected by this option.Ģ. In my mind this is confusing because RE-compile suggests that a "compile is performed again on an existing compiled plan" yet no plan exists. WITH RECOMPILE or OPTION (RECOMPILE) - in this context a new plan is compiled but not cached when a query runs. Here are three uses of the term "recompile":ġ. It is a good idea to review the code of each of the stored procedures.I wanted to make this post because I think the term “recompile” is used to describe a few slightly different concepts in SQL Server. If the Re-Compiles rate has been a large percentage of the total Compiles rate for some time, then you should investigate further. When the alarm is raised, use the SQL Server | SQL Activity Drilldown | Summary page | Call Rates chart to determine if this is a persistent problem. High server activity causing the plan to be aged out of cache.Restoring the database containing the procedure or any of the objects the procedure references (if you are * performing cross-database operations).Running sp_recompile against any table referenced in the stored procedure.The use of the WITH RECOMPILE clause in the CREATE PROCEDURE or EXECUTE statement.Stored procedures performing certain operations on temporary tables.Stored procedures with a mix of Data Definition Language (DDL) and Data Manipulation Language (DML) operations.A sufficient percentage of data changes in a table that is referenced by the stored procedure.Schema changes to any of the referenced objects, including adding or dropping constraints, defaults, or rules.There are many conditions that can cause SQL Server to recompile a stored procedure. In general, the fewer recompiles the better. Many recompiles can add an excessive CPU load on SQL Server and slow down everything running on that machine. This not only slows down the process that is running the procedure, but adds extra CPU load on the server. SQL Server pauses the query execution and compiles the stored procedure again. Because of this, SQL Server stores execution plans in the Procedure Cache in the hope that they can be reused later, thereby saving the CPU that would otherwise be required to re-compile the query or stored procedure.Ī Recompile occurs when SQL Server believes that the execution plan for a stored procedure that is currently running may no longer be the best possible plan. This is known as an execution plan.Ī compile can take a relatively large amount of time and CPU resources, especially when the query or stored procedure is large or complex. It comes up with what it considers to be the fastest way of running the query. It then takes into account all the existing indexes, locking methods and join algorithms that could help the query run faster. During a compile, SQL Server looks at the query, including the tables, clause conditions, joins, sub queries, sort and grouping requirements used. This highlights when more than a certain percentage of compilations are due to run-time recompiles.Ī Compile is the process SQL Server goes through to determine how a query or stored procedure will be run. SQL Server 2017 and above hosted on Linux.Collect additional diagnostic information.Transaction Log Shipping Secondary Database.SQL Agent - Long Running Jobs (Percent). ![]()
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