What is with recompile in SQL Server?
When SQL Server recompiles stored procedures, only the statement that caused the recompilation is compiled, instead of the complete procedure. If certain queries in a procedure regularly use atypical or temporary values, procedure performance can be improved by using the RECOMPILE query hint inside those queries.
What is compilation and recompilation in SQL Server?
A recompilation is the same process as a compilation, just executed again. If the database structure or data change significantly, a recompilation is required to create a new query execution plan that will be optimal for the new database state and ensure better procedure performance.
What is the use of with recompile statement?
Using WITH RECOMPILE effectively returns us to SQL Server 2000 behaviour, where the entire stored procedure is recompiled on every execution. A better alternative, on SQL Server 2005 and later, is to use the OPTION (RECOMPILE) query hint on just the statement that suffers from the parameter-sniffing problem.
What causes stored procedure to recompile?
There are multiple reasons why a recompilation can occur. A recompile of an execution plan could be due to database level configuration changes, schema changes, index changes, etc.
Why stored procedure is better than query?
every query is submited it will be compiled & then executed. where as stored procedure is compiled when it is submitted for the first time & this compiled content is stored in something called procedure cache,for subsequent calls no compilation,just execution & hence better performance than query.
What is Sp_refreshsqlmodule?
It means that whenever you modify an underlying object of any non-schema-bound object then the metadata DOES NOT get updated automatically. Lets update it manually with the help of sp_refreshsqlmodule (One of the system stored procedures). USE tempdb. GO.
What is option recompile?
OPTION(RECOMPILE) tells the server not to cache the pan for given query. This means that another execution of the same query will require to elaborate a new(maybe different) plan. This is used in the queries with parameters to prevent parameter sniffing issue.
What does compile mean SQL?
Yes, a compile in Sql Server refers to when an Execution Plan is first built in order to execute a particular query in the most efficient way possible.
What is query compilation?
Query compilation is the complete process from the submission of a query to the actual execution. There are many steps to query compilation? one of which is optimization. All T-SQL statements are compiled, but not all are optimized.
How do you compile a procedure?
Compile one or more procedures, using one of these methods:
- Use the ALTER PROCEDURE or ALTER PACKAGE command to recompile the procedure or the entire package.
- Drop the procedure and create it again.
- Use CREATE OR REPLACE to recompile the procedure.
How do you solve a 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.
Which method is used to compile the query?
To create a compiled query, we have a static method named “Compile” in the “System. Data. Objects. CompiledQuery” namespace.
What is parameter sniffing in stored procedure?
Parameter Sniffing is the process of looking to the first passed parameters values when compiling the stored procedure in order to create an optimal execution plan that fits these parameters values and use it for all values.
Does alter procedure force recompile?
12 Answers. ALTER will also force a recompile of the entire procedure. Statement level recompile applies to statements inside procedures, eg. a single SELECT, that are recompiled because the underlying tables changes, w/o any change to the procedure.