sql stored procedure performance tuning

Store common or complex tasks in advance with SQL statements and a specified name, to enable the database to provide services with the same functions as the predefined stored procedure, you only need to call execute to automatically complete the command. Advantages of Stored Procedures 1. the

ObjectiveAn index is one of the most important objects in a relational database and can significantly reduce the consumption of disk I/O and logical reads to improve the lookup performance of a SELECT statement. But it is a double-edged sword, and improper use can affect performance: He needs extra controls to hold the index information, and when the data is updated, it takes some extra overhead to keep the

Storedprocedure is a set of SQL statements for specific functions. It is a program written in the transact-SQL language provided by sqlserver. Compiled and stored in. A stored procedure is an important object in a database. You can specify the name of a

students have not graduated from the list, after graduation can not be selected classes;2 in the batch selection of students, but also need to add a corresponding course;3 Point added after the end of elective course. The small amount of data may not see the use of Java programs directly to do database operations this way to achieve the weaknesses, because it every time in the operation of the database, there are frequent and database I/O direct interaction, this

One of the practical skills that can greatly improve the performance of SQL TUNING optimization. When we perform SQL optimization, we often encounter the need to sort a large number of datasets and then retrieve the first part of the results from the sorted set. In this case, when we write

Tags: style blog http color using OS strong dataThe previous blog describes the use of SQL views, a blog that provides a brief introduction to stored procedures through content and instance applications. In the process of machine room reconstruction, made a big taboo (database design in the reconstruction process was modified), so the impact of a function of the implementation, and then re-knocked the compu

. Text, ntext, and image parameters can be used as OUTPUT parameters. The output parameters that use outputs keyword can be cursor placeholders.8, NRepresents a placeholder that can specify up to 2,100 parameters.9. {RECOMPILE | Encryption | RECOMPILE, encryption}RECOMPILE indicates that SQL Server does not cache the schedule for this procedure, which is compiled again at execution time. Use the RECOMPILE o

Label:Original: T-SQL performance Tuning-information collectionIO information (starting from server startup)--database IO Analysiswith iofordatabase as (SELECT db_name (vfs.database_id) as DatabaseName, case if Smf.type = 1 Then ' log_file ' ELSE ' data_file ' END As Databasefile_type, sum (vfs.num_of_bytes_written) as Io_write, sum (VFS.N

/1000 N ' Total time spent in MS ',total_worker_time/1000 N ' Total CPU time MS ',Total_physical_reads N ' Total number of physical reads ',Total_logical_reads/execution_count N ' Each logical read ',Total_logical_reads N ' Logical reads total number of times ',Total number of total_logical_writes N ' logical writes ',Execution_count N ' execution times ',Creation_time N ' statement compilation Time ',Last_execution_time N ' Last Execution time ',SUBSTRING (St.text, (QS.STATEMENT_START_OFFSET/2)

Tags: Retrieve return simple select disadvantage Count pass ref onegood text to top : Advantages and disadvantages of SQL stored procedures SQL Server Stored Procedures I. Creating and using Stored procedures Oracle version: CREATE PROCEDUREMailin

The specific differences between stored procedures and functions are:Core Tip : no difference in nature. Only the function has a limit to return only one scalar, and the stored procedure can return multiple. and functions can be embedded in SQL and can be called in SQL state

Procedure name@ Parameter 1 data type [= default value],......@ parameter n data type [= default value]As...........................(2) Calling a stored procedure with input parametersWay One:EXEC usp_score_byparam ' SQL Server BASIC programming ', 70Way two:exec usp_score_byparam @coursename = '

This article explains how to execute a stored procedure problem when you start SQL Server. How do I execute a stored procedure when I start SQL Server? Create the stored

milliseconds page2:0 seconds 218 milliseconds page3:0 seconds 359 milliseconds page4:0 seconds 468 milliseconds page5:0 seconds 578 milliseconds page6:0 seconds 687 milliseconds Conclusion: If the total number of statistics recorded in the stored procedure will seriously affect the efficiency, the same query condition record total must be the same, so if the first page is executed after the total number of

Today, a colleague asked how to debug a stored procedure in SQL Server (our company is using SQL Server R2), and a look at it, and the previous use of SQL Server 2000 is really very different, I am really dizzy.So I figured it out a bit.

SQL stored procedure naming rules Standardized naming can improve the efficiency of development and maintenance. If you are creating a new stored procedure, refer to the following naming rules. Syntax: The stored

sp_xml_removedocument call deletes the DOM document resource.In another example below, I will delete a few rows of data based on the set of customer IDs that are passed in. The XML string used is as follows:Root> Customer> CustomerID>1CustomerID> Customer> Customer> CustomerID>2CustomerID> Customer> Customer> CustomerID>3CustomerID> Customer> Root> The stored procedures used are as follows: exec sp_xml_prepared

To do a recent project, you need to do a CLR stored procedure for SQL SERVER 2005 and study the implementation of the CLR. For the convenience of later use, summed up my implementation process here, but also for the CLR interested but do not know how to achieve the friends to do a reference, if there are different views, hope to teach more. Here is a first exampl

server| stored procedures to create a stored procedure body Stored procedure logic resides in the stored procedure body. A stored

1. Create a stored procedure Like a data table, we need to create a stored procedure before using it. Its concise syntax is: Create proc stored procedure name [Parameter list (multiple parameters are separated by commas (,)] As