sql server insert slow performance

The new Xml.modify () method is added to SQL Server, xml.modify (insert), xml.modify (delete), xml.modify (replace) to insert, delete, and modify the XML. This article takes the following XML as an example to illustrate three types of DML: Copy Code code as follows: DECLARE @XMLVar XML; SET @XMLVar =

executed dynamically, So we modify the SQL statements in the stored procedure without recompiling and publishing the program.The field in the user table user_registered set the default value (GETDATE ()), then we improve the performance of the system by eliminating the table default constraint, in short, we need to provide the value of the field user_registered.Next, let's omit the default value constraint

Tags: Data Warehouse res warehouse IMA Misc SYS cell nbsp HighlightTo configure the Data collector: 1. Create a login and map roles 2. Configuring the Management Data Warehouse 3. Create collection sets, collection items----msdb data store sp_syscollector_create ... 4. Automatically configure the related job Specific steps: After creating the diagram: To configure Data collection: The refresh looks like this: The method created: Use msdb go declare @collectionsetid int --return val

. Therefore, during the design process, you should carefully check all the queries based on the query design principles, and design indexes based on the query optimization features. (1) narrow indexes have high efficiency. For narrow indexes, a large number of index rows can be stored on each page, and the index level is also small. Therefore, more index pages can be stored in the cache, which also reduces I/O operations. (2) the SQL

Just after SQL Server inserts multiple data records into the insert statement, insert a single data record: insertintoemproyee (e_name, e_sex) values (Tang Jia sanshao, 0); insertintoemproyee (e_name, e_sex) select skeleton genie, more than 0 Data inserts: insertintoemproyee (e_name, e_sex) select silkworm Soil Just a

all indexes are valid for queries, SQL queries are optimized based on the data in the table, and SQL queries may not take advantage of indexes when there is a large amount of data duplication in the index columns. 11, the index is not the more the better, the index submitted select efficiency, but reduced the efficiency of insert and update. The number of indexe

, Len (@PrintText)-2) WHERE right (@PrintText, 2) in (char) +char (Ten), Char (+char (13)) SELECT @PrintText =left (@PrintText, LEN (@PrintText)-1) WHERE Right (@PrintText, 1) in (char, char ())--select @Print Text=right (@PrintText, LEN (@PrintText)-1) WHERE left (@PrintText, 1) in (char, char ()) PRINT @PrintText--p RINT '/*** len= ' + cast (len (@PrintText) as varchar) + ' Datalength= ' + cast (datalength (@PrintText) as varchar) + ' ***/' END select @[emailprotected] Select @PrintT Ext=

]. ['+@tablename+']' --Identity_insert OFF IF @isidentity != "' BEGIN SET @sql = @sql+'SET Identity_insert ['+@todb+']. [dbo]. ['+@tablename+'] OFF' END --return to SQL PRINT(@sql)PRINT('GO')+CHAR( -) FETCH NEXT from @itemCur into @tablenameEND CLOSE @itemCurdeallocate @itemCur(b) The foll

providing better performance, is slow performance because it does not apply to the current query. Basic knowledge of execution plan caching 1, what is the execution plan cache After the SQL Server query engine receives the SQL s

performance of the two-range query with YY_BH Index is certainly greatly improved.9. Appropriate and inappropriate in the query conditionsQuery parameters can include actions: =, Inappropriate query parameters are: not,! =, 10. Use Delete sparinglyIn general, some of the logic of deleting data will be implemented more or less in stored procedures. For a small number of tables, the problem is not very big. But for large data tables, deleting data with

XML is added to SQL Server. the Modify () method is xml. modify (insert), xml. modify (delete), xml. modify (replace) corresponds to XML insert, delete, and modify operations. The following XML is used as an example to describe three DML types: Declare @ XMLVar xml =' ' 1. Introduction to XML. Modify (

XML is added to SQL Server. the Modify () method is xml. modify (insert), xml. modify (delete), xml. modify (replace) corresponds to XML insert, delete, and modify operations.The following XML is used as an example to describe three DML types:Declare@ XMLVar xml =''1. Introduction to XML. Modify (

. For example, when multiple indexes are used, the SELECT query may run faster. However, the speed of DML (insert, update, and delete) operations will be significantly slowed down because more indexes must be maintained for each operation. Therefore, if your query mainly contains select statements, it is very helpful to use more indexes. If your applicationProgramTo perform many DML operations, it is necessary to control the number of created indexes.

... Sure enough ... For example :insert into k_v_test (tempvalues('Temp ', N' age ','+ ') 。。。。 Now the code: Usestring007if exists(Select 1 fromsysobjectswhereId= object_id('k_v_test') andType= 'U') Drop Tablek_v_testGo Create TableK_v_test (Temp varchar( -) not NULL, Autoidint Identity, Key_nvarchar( -) not NULL, Value_nvarchar( $) not NULL, constraintPk_k_v_testPrimary Key(autoid)

after you've processed historical data and report data, then add these new hardware, such as faster CPUs and hard drives, larger memory, and so on, but add new hardware postscript to modify your SQL Server configuration to accommodate these new hardware, such as opening/ 3G switch to use more memory. Scale out when scaling the up does isn't suffice or is cost-prohibitive. Use horizontal expansion When yo

, Name) VALUES (5, ‘Five‘)CREATE TABLE #Test2( ID int NOT NULL PRIMARY KEY, Name varchar(50) NOT NULL)INSERT #Test2 (ID, Name) VALUES (1, ‘One‘)INSERT #Test2 (ID, Name) VALUES (2, ‘Two‘)INSERT #Test2 (ID, Name) VALUES (3, ‘Three‘)INSERT #Test2 (ID, Name) VALUES (4, ‘Four‘)INSERT