How do you fix parameter sniffing?
Workarounds for SQL Server Parameter Sniffing
- Create SQL Server Stored Procedures using the WITH RECOMPILE Option.
- Use the SQL Server Hint OPTION (RECOMPILE)
- Use the SQL Server Hint OPTION (OPTIMIZE FOR)
- Use Dummy Variables on SQL Server Stored Procedures.
- Disable SQL Server Parameter Sniffing at the Instance Level.
Where is parameter sniffing in SQL Server?
There are several solutions to deal with parameter sniffing as below:
- Use EXEC () to run dynamic SQL statements.
- Use local variables.
- Use query hint in the statement to specify the execution plan. A:With Recompile. B:Specify the Join operation ({ LOOP | MERGE | HASH} JOIN)(not recommended)
Why is there a problem with parameter sniffing?
The problem with parameter sniffing is the fact that the first set of parameter values are used to determine the execution plan. To overcome this problem, all you need to do is to recompile the stored procedure every time it is executed.
Why does parameter sniffing hurt your SQL query performance?
If your parameter sniffed query doesn’t get ran often, or if the query doesn’t run often enough to stay in the query plan cache anyway, then RECOMPILE is a good solution. 2. Use the OPTIMIZE FOR query hint Another option we have is to add either one of the following hints to our query.
How to disable parameter sniffing in Redgate Software?
Another method of resolving the parameter sniffing issue is to disable parameter sniffing altogether. This is not done with a switch or database option, but can be done from within the script of your stored procedure code. Here is an example of how I created my stored procedure so parameter sniffing is disabled:
Why does SQL query parameterize on its own?
Sometimes SQL will parameterize simple queries on its own. That’s weird. We have two query executions, they are using the same plan, and neither plan is using our nonclustered index on Name! Let’s step back and try again. First, clear the query plan cache for this stored procedure: