What is the use of with recompile statement?

Asked By: Timofey Clavain | Last Updated: 22nd May, 2020
Category: technology and computing databases
4.9/5 (28 Views . 23 Votes)
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.

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Consequently, what is the use of recompile in SQL Server?

RECOMPILE – specifies that after the query is executed, its query execution plan stored in cache is removed from cache. When the same query is executed again, there will be no existing plan in cache, so the query will have to be recompiled.

Likewise, what is with recompile option in SP? Both OPTION(RECOMPILE) and WITH RECOMPILE will give you execution plans based on the parameters used each time, but only OPTION (RECOMPILE) allows "parameter embedding optimization" where the parameters are replaced with literal constants when its parsing the queries.

Secondly, why do we need to recompile stored procedures?

Another reason to force a stored procedure to recompile is to counteract, when necessary, the "parameter sniffing" behavior of stored procedure compilation. When SQL Server executes stored procedures, any parameter values used by the procedure when it compiles are included as part of generating the query plan.

How do you recompile a procedure?

To recompile a stored procedure by using sp_recompile Select New Query, then copy and paste the following example into the query window and click Execute. This does not execute the procedure but it does mark the procedure to be recompiled so that its query plan is updated the next time that the procedure is executed.

26 Related Question Answers Found

What is Sp_refreshsqlmodule?

Updates the metadata for the specified non-schema-bound stored procedure, user-defined function, view, DML trigger, database-level DDL trigger, or server-level DDL trigger in the current database.

How is SQL compiled?

It is compiled in the sense that rather than executing the SQL text directly all RDBMSs parse the text (as any interpreter or compiler does) then compiles it to a query plan which is what is actually executed. Developing that query plan often entails several optimization steps to decide on the best query plan.

What is Sp_recompile?

sp_recompile looks for an object in the current database only. The queries used by stored procedures, or triggers, and user-defined functions are optimized only when they are compiled. SQL Server automatically recompiles stored procedures, triggers, and user-defined functions when it is advantageous to do this.

How do you fix parameter sniffing?

Workarounds for SQL Server Parameter Sniffing
  1. Create SQL Server Stored Procedures using the WITH RECOMPILE Option.
  2. Use the SQL Server Hint OPTION (RECOMPILE)
  3. Use the SQL Server Hint OPTION (OPTIMIZE FOR)
  4. Use Dummy Variables on SQL Server Stored Procedures.
  5. Disable SQL Server Parameter Sniffing at the Instance Level.

What happens when a stored procedure is compiled?

A stored procedure is compiled code that you can call from within T-SQL statements or from client applications. SQL Server runs the code in the procedure and then returns the results to the calling application. Using stored procedures is efficient for several reasons.

What is recompilation?

: a second or subsequent compilation: as. a : the act or process of compiling something again Aimed at the high-performance computing market, Meiosys' MetaCluster software can move applications between a server or a group of servers and other machines without the need for application modification or recompilation. —

What is parameter sniffing SQL Server?

SQL Server uses a process called parameter sniffing when it executes stored procedures that have – you guessed it – parameters. When the procedure is compiled or recompiled, the value passed into the parameter is evaluated and used to create an execution plan.

What does Option recompile do?

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 is parameter sniffing?

Parameter Sniffing. When the SQL Server database engine compiles a stored procedure it looks at the parameter values being passed and creates an execution plan based on these parameters. The process of looking at parameter values when compiling a stored procedure is commonly called “parameter sniffing”.

How do I save a stored procedure in SQL Developer?

Open SQL Developer and connect to the Oracle Database. Then left side in Connections pane, expand the schema node in which you want to execute the stored procedure. Then expand the Procedures node and select the stored procedure you want to execute and do the right click on it.

What is the command used to recompile the stored procedure at run time?

If you want your stored procedure to always recompile at run time, you can add the keyword RECOMPILE when you create the stored procedure. Additionally, if the stored procedure has to be recompiled at only one time, in that case, you can add RECOMPILE word one time only and run the SP as well.

How do I compile a procedure in SQL Developer?

Creating and Compiling a PL/SQL Procedure
  1. Right-click on the Procedures node in the Connections Navigator, to invoke the context menu, and select NEW PROCEDURE.
  2. Enter EMP_LIST as the procedure name.
  3. The procedure is created.
  4. Replace the following PL/SQL:
  5. Compile errors, if any.

What is SQL Server compile?

When the documentation refers to recompiling a stored procedure or the SQL Server Profiler records a compilation event, compilation means the process of compiling the special T-SQL statements and optimizing the SELECT, INSERT, UPDATE, and DELETE statements.

How do I edit a procedure in Toad?

How to Edit Stored Procedure in Toad for Oracle?
  1. In Toad, click on menu Database > Schema Browser.
  2. Select the Procedure from drop-down menu or from the Tab (if Schema Browser configured as Tab).
  3. Then list of procedures will be displayed for the current user.
  4. From the shortcut menu, click on Load in Editor option.

How do you update a procedure in Oracle?

Here's an UPDATE stored procedure example in Oracle database.
  1. Table SQL Script. DBUSER table creation script.
  2. Stored Procedure. A stored procedure, accept 2 IN parameters and update the username field based on the provided userId.
  3. Calls from PL/SQL. Call from PL/SQL like this : BEGIN updateDBUSER(1001,'new_mkyong'); END;

How do I compile a procedure in Toad?

1 Answer. Open the Schema Browser, right-click on your stored procedure, select "Load in Editor". Make your changes, then click "Execute/Compile".

How do I recompile an object in Oracle?

Compile Invalid objects in oracle
  1. Compile all the objects of the database using UTLRP. SQL. This script may take some time, depending on the number of objects.
  2. Compile objects of a particular schema: EXEC DBMS_UTILITY. compile_schema(schema => 'APPS');
  3. Compiling individual objects: -- Compiling a package; ALTER PACKAGE APPS.