sql stored procedure performance tuning

The use of triggers is described in the previous blog, and it also mentions that triggers are a special stored procedure, so what is a stored procedure? TheyWhat's the difference between the two?In fact, the main difference is that the trigger is automatically executed when the condition is met, and the

tables with frequent Records added during the exchange, cluster indexes (clustered) are used to reduce the number of users who add records to the last page of the table and generate hot spots at the end of the table, cause a deadlock. This type of table is mostly a flow meter for current accounts. It features that a large number of records need to be appended at the end of the table during the exchange period, and the added records are not deleted or less.● For tables with a small number of rec

SQL Stored Procedure 1 bitsCN.com 1. MySQL stored procedure: a stored procedure is a programmable function that is created and saved in the database.

Alas, I only blame myself for being academic and not refined. Now I have learned the SQL stored procedure. I have found a lot of information from the Internet, but it is very messy and the positioning is high. It is not suitable for me to study such a dish, now I will summarize the complete process of using SQL

CATCH block.RAISERROR (@ErrorMessage,--Message text.@ErrorSeverity,--Severity.@ErrorState-State.); END CATCH END GO BEGIN TRY SELECT GETDATE () SELECT 1/0--evergreen divide by zero example! END TRY BEGIN CATCH SELECT ' There is an error! ' + error_message () RETURN END CATCH; 2. The function table that obtains the error message: The following system functions are valid in the CATCH block. Can be

There should be different filegroups in the database before the partition table is created;Assuming the database name is Df17datapro, create the user table UserID, put the first 500,000 data in the primary filegroup, place the 50~100 in the FG1 filegroup, and put more than 100 in the FG2 filegroup1. Add File group Fg1,fg2ALTER DATABASE Df17datapro ADD FILEGROUP FG1ALTER DATABASE df17dataproadd FILEGROUP fg22. Adding files to a filegroupALTER TABLEDf17dataproADD FILE(NAME=Df17datapro1,filename=

fariqi descselect O. GID, O. mid, O. title, O. fadanwei, O. fariqi from tgongwen o, @ indextable twhere O. gid = T. NID and T. id> @ pagelowerboundand T. ID The above stored procedures use the latest SQL server technology-Table variables. It should be said that this stored procedure is also a very good paging

Today, I am working on an OA report. I use a stored procedure to calculate some data. When doing a for xxx in xxxx loop end loop; loop, I never knew it was Mao. I can't catch the no_data_found exception in for any more. Once this no_data_found Oracle occurs, it automatically jumps out of the for loop, but I don't know what went wrong, that was depressing for an hour. Shit. Later I remembered that pl/

Today, I am working on an OA report. I use a stored procedure to calculate some data. When doing a for XXX in xxxx loop end loop; loop, I never knew it was Mao. I cannot catch the no_data_found exception in for any more. Once this no_data_found occurs Oracle will automatically Jump Out Of The for loop, but I don't know where the error occurred. It was a depressing hour. Shit. Later I remembered that P

Recently, the following project encountered an urgent problem, my old horse and young people to fight together. The problem is that many queries are incredibly slow when the pressure data is poured into the database. Said there must be some basic guidelines for performance issues. The order of performance problems tunning 1 Architecture design (software architecture and database design, poor design is alm

execution plan you can see that the performance improvement is still very large. This is the data of the test environment, if the data volume is large, the advantage is more obvious.So for this problem, the cause is that there is a job data processing frequency is relatively high, in the test environment is difficult to locate where there is a problem, and the speed can also be accepted, but in the production environment is always slower, in fact, th

Many programmers friends see SQL as the Flood Lake Beast, in fact, in-depth analysis, more time and patience, SQL is understandable.This article is mainly for new contact with the new friend of SQL, a simple SQL stored procedure t

Tags: style blog class code c javaI. Overview　　Stored Procedures ( Stored Procedure ) is a set of functions to complete a specific SQL statement set, which is compiled and stored in the database. The user executes it by specifying the name of the

Concepts, advantages, and syntax of SQL Stored procedures before learning program procedures, what is a stored procedure first? What advantages does stored procedure have? Definition: Store common or complex tasks in advance with

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

Note: The defined SQL statement to execute must be of type nvarcharCREATE PROC P_branchordersalesstatistics@beginTime DateTime,--Start time@endTime DateTime,--End time@branchCode varchar (20),--store code@NewMemberCount int out,--number of new members@OrderCount int out,--order quantity@SalesTotalPrice Decimal (18,2) out,--Sales@ProfitTotalPrice Decimal (18,2) out--gross marginAsBEGINDECLARE @sqlfilter nvarchar (max)DECLARE @sqlmain nvarchar (max)DECL

1. Create with Try ... Stored procedure templates for catch　　Copy the following code, and then create a new query, you can write the SQL statement, after execution, a your own stored procedures are established! Use [DB]--set the corresponding databaseGOSETAnsi_nulls onGOSETQuoted_identifier onGO-- =====================

2014-08-23 BaoxinjianI. Summary A script that is circulated online to query the efficiency of a single SQL query and export it as an HTML report, similar in function to Dbms_profilerQuery sql_id by session, only run script, export as HTML reportThe SQL script: Http://files.cnblogs.com/eastsea/sqlcheck.zipIi. cases-Using the script data SQL

Performance | Statement One, the problem of the proposed In the early stage of the application system development, because the development database data is few, to query the SQL statement, the complex view compilation and so on cannot realize the SQL statement various writing performance good or bad, but if the applica

SQL Server stored procedure syntax: Create PROC [edure] procedure_name [; number] [{@parameter data_type} [varying] [= default] [OUTPUT] Introduction of parameters 1, procedure_name The name of the new stored procedure.