Category: Performance
Item: SPs with RECOMPILE
What is the RECOMPILE option?
The compilation is the process when a query execution plan of a stored procedure is optimized based on the current database objects state.
This query execution plan is often stored in the cache to be quickly accessed.
Recompilation is the same process as a compilation, just executed again.
Why should you care about it?
When you use the WITH RECOMPILE option, the store procedure gets a new execution plan every time it runs.
That means SQL Server will execute the same action multiple times, degrading performance (high CPU usage).
How can you list all stored procedures with recompile option?
You can use the following script to list them from all databases:
EXECUTE master.sys.sp_MSforeachdb
'USE [?];SELECT DISTINCT Database_Name = DB_Name(),SP_Name = SO.name,ISR.SPECIFIC_SCHEMA As Schema_NameFROM sys.sql_modules AS SMLEFT OUTER JOIN master.sys.databases AS sDB ON SM.object_id = DB_id()LEFT OUTER JOIN dbo.sysobjects AS SO ON SM.object_id = SO.id and type = ''P''
LEFT OUTER JOIN INFORMATION_SCHEMA.ROUTINES AS ISRon ISR.Routine_Name = SO.name AND ISR.SPECIFIC_CATALOG = DB_Name()WHERE SM.is_recompiled=1 OPTION (RECOMPILE);';
How to fix them?
1. When the store procedure does not run often, this can probably be ignored.
2. If SP often runs, investigate further, recompilation is not necessarily the best solution.
More information
Microsoft – Recompile a Stored Procedure.
Frequent query recompilations – a SQL query performance killer – introduction, Milena Petrovic – SQLShack.
