sql server varchar max performance

In SQL Server database operations, we often use stored procedures to implement the query data paging to facilitate the browsing of the viewer. In this article, we summarize the methods of five SQL Server paging stored procedures and compare their performance, so let's take a

'@ PkName nvarchar (50) = 'id', -- primary key name@ StrOrder varchar (255) = '', -- Name of the sorted field, for example, 'order by id desc'@ StrWhere varchar (1500) = '', -- Query condition (Note: Do not add where), for example, 'xname like ''' % 222 name % '''@ PageIndex int = 1, -- page number, for example, 2@ PageSize int = 20, -- number of records per page, for example, 20@ RecordCount int = 0 out, -

=SubString(@LastChars,@EndIndex+1,LEN(@LastChars)-@EndIndex+1) --Select @LastChars as Lastchars; Set @EndIndex=@EndIndex+@Step; EndIf LEN(@LastChars)>0 Begin Insert into#StringToTableEntry_Temp10SelectId fromDbo. StringToTable2 (@LastChars,',');EndSelect COUNT(0) from#StringToTableEntry_Temp10StringToTable2 function:ALTER FUNCTION [dbo].[stringtotable]( @ids [nvarchar](Max), @separator [Char](1))RETURNS @IdsTable TABLE( [Id] INT

suggestions.DatabaseApplicationSystemDesignIt should contain two aspects: 1. StructureDesign, That isDesignDatabase framework or structure; second, behaviorDesign, That isDesignApplicationPrograms and transactions.1 DatabaseDesignTo achieve optimal performance in a good SQL Server SolutionPerformanceThe most important thing is to have a good database.DesignSolut

technique for improving efficiency is to use the DISTINCT keyword to find separate reports for rows of data instead of using the GROUP by clause. In this case, SQL using the DISTINCT keyword is more efficient. Use GROUP by when you need to calculate aggregate functions (SUM, COUNT, MAX, and so on). Also, if your query always returns a unique row for itself, do not use the DISTINCT keyword. In this case, th

Permission management is involved in program development. The system uses an integer to record user permissions. The permission level is set: Level1 1 Level2 2 Level3 4 Level4 8 Level5 16 Level6 31 Level7 32 Level8 64 Level9 127 Level10 128 Level11 255 Level12 65535 In the database, if a user A has a permission level of 1, his three

search for separate reports of data rows instead of using the group by clause. In this case, SQL statements using the distinct keyword are more efficient. Use group by when you need to calculate Aggregate functions (sum, Count, Max, etc. In addition, if your query always returns a unique row, do not use the distinct keyword. In this case, the distinct keyword only increases the system overhead. As you ca

rows reserved data index_size unused TB_WCB 9439661 317208 kb 167168 KB 149872 KB 168 KB */ we found that the size before index compression was 329M. And after compression is 149M, the compression ratio is 45%. The effect is also very obvious. Summarize: Compression through tables and indexes. We can reduce the disk space occupied by the table, this is only part of it, and more importantly, reading the same amount of data, just need to read less data pages,

data rows instead of using the group by clause. In this case, SQL statements using the distinct keyword are more efficient. Use group by when you need to calculate Aggregate functions (sum, Count, Max, etc. In addition, if your query always returns a unique row, do not use the distinct keyword. In this case, the distinct keyword only increases the system overhead. As you can see, there are a lot of technol

A few SQL Server paging stored procedure writing and performance comparisonsStored procedure 5 Kinds of pagination, the following code is from the forgotten when from someone else that CTRL + C, so just as a collection, hope the author see don't Spray me.------Create a Database tutorial data_test-----Create DATABASE Data_testGoUse Data_testGoCREATE TABLE Tb_testt