Why are there so many compilations in SQL Server?
You are seeing evidence of an excessive number of query compilations or recompilations in SQL Server. This may be manifesting itself as high CPU load, or longer transaction execution times.
What makes a proc run faster than a stored Proc?
Finally, the same is sometimes the case with stored procs: a very slow running proc speeds up tremendously when running its code directly, instead of calling the procedure –and even faster, according to the previous, when its parameters are replaced with hardcoded values
What’s the difference between parameterized and hardcoded queries?
Very often there is a huge performance difference when using parameters in a query, compared to running the same code after replacing the parameters with hardcoded values: the parameterized version of the code runs much slower!
Is there a parameter sniffing in SQL Server?
The case is not parameter sniffing as it is not a (compiled) stored proc, but code executed directly from the editor and the performance issue has been observed in different versions of SQL Server (2000 and 2005). How is this explained and how can the parameterized queries have similar performance with the hardcoded ones?
What does frequent recompilation of a SQL query mean?
The metric that shows the number of query and procedure recompilations in a second is SQL Re-Compilations/Sec. A high value is a clear indication of frequent recompilations that lead to processor stress and SQL Server performance degradation.
Where can I find the number of recompilations in SQL?
Windows Performance Monitor can be used to track both compilations and recompilations. The metric that tracks the number of compilations per second is SQL Compilations/Sec. It’s located in the SQL Server Statistics section.
Which is the best metric for SQL recompilations?
The metric that shows the number of query and procedure recompilations in a second is SQL Re-Compilations/Sec. A high value is a clear indication of frequent recompilations that lead to processor stress and SQL Server performance degradation. The ideal value for the number of recompilations per second is zero.