In this case, recompiling the procedure and forcing a new execution plan can improve performance. If there has been significant change to the tables or data referenced by the procedure, the precompiled plan may actually cause the procedure to perform slower. Since the query processor does not have to create a new plan, it typically takes less time to process the procedure. The application tier remains separate and does not have to know how about any changes to database layouts, relationships, or processes.īy default, a procedure compiles the first time it is executed and creates an execution plan that is reused for subsequent executions. When client applications call procedures and keep database operations in the data tier, only the procedures must be updated for any changes in the underlying database. This eliminates needless rewrites of the same code, decreases code inconsistency, and allows the code to be accessed and executed by any user or application possessing the necessary permissions. The code for any repetitious database operation is the perfect candidate for encapsulation in procedures. For more information, see SQL Server Encryption. Procedures can be encrypted, helping to obfuscate the source code. Since parameter input is treated as a literal value and not as executable code, it is more difficult for an attacker to insert a command into the Transact-SQL statement(s) inside the procedure and compromise security. Using procedure parameters helps guard against SQL injection attacks. Therefore, malicious users cannot see table and database object names, embed Transact-SQL statements of their own, or search for critical data. When calling a procedure over the network, only the call to execute the procedure is visible. By incorporating the TRUNCATE TABLE statement in a module and specifying that module execute as a user who has permissions to modify the table, you can extend the permissions to truncate the table to the user that you grant EXECUTE permissions on the module. Granting a user ALTER permissions on a table may not be ideal because the user will effectively have permissions well beyond the ability to truncate a table. To execute TRUNCATE TABLE, the user must have ALTER permissions on the specified table. For example, some actions such as TRUNCATE TABLE, do not have grantable permissions. The EXECUTE AS clause can be specified in the CREATE PROCEDURE statement to enable impersonating another user, or enable users or applications to perform certain database activities without needing direct permissions on the underlying objects and commands. This eliminates the requirement to grant permissions at the individual object level and simplifies the security layers. The procedure controls what processes and activities are performed and protects the underlying database objects. Multiple users and client programs can perform operations on underlying database objects through a procedure, even if the users and programs do not have direct permissions on those underlying objects. Without the code encapsulation provided by a procedure, every individual line of code would have to cross the network. This can significantly reduce network traffic between the server and client because only the call to execute the procedure is sent across the network. The commands in a procedure are executed as a single batch of code. The following list describes some benefits of using procedures. Return a status value to a calling program to indicate success or failure (and the reason for failure). Procedures resemble constructs in other programming languages because they can:Īccept input parameters and return multiple values in the form of output parameters to the calling program.Ĭontain programming statements that perform operations in the database. NET Framework common runtime language (CLR) method. It also identifies the SPID if I need to kill a process.Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW)Ī stored procedure in SQL Server is a group of one or more Transact-SQL statements or a reference to a Microsoft. I wish I remember who I got this original code from, but it has been VERY helpful. OUTER APPLY sys.dm_exec_query_plan (der.plan_handle) pln OUTER APPLY SYS.dm_exec_sql_text (der.sql_handle) Sql INSERT INTO sp_who2 = CommandText = sql.text , Here is the sp_who2 code which I modified to make it easier to track progress: Declare sysname = null Each time you re-run this SP_Who2 process, it will display the code running at the time.This will let u know how far along your proc is at anytime. Using code I found on Stackoverflow of SP_WHO2, you can see the first column has the current code actually being run from the PROC. I have found a great NON-INTRUSIVE way to see the progress of along running stored procedure.
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