sql server sparse columns performance

table [Table name] Drop constraint name Create Default ValueAlter table [Table name] add constraint default name: Default \ '51windows. Net \ 'for [field name] Delete default valueAlter table [Table name] Drop constraint default name Delete logs in SQL Server to reduce the size of database filesDump transaction database name with no_logBackup log database name with no_logDBCC shrinkdatabase (database name)

=''SELECT @ str = @ str + ',' + value FROM tb WHERE id = @ idReturn stuff (@ str, 1, 1 ,'')ENDGO-- Call a functionSELECt id,Value = dbo. f_strUnite (id) FROM tb group by idDrop table tbDrop function dbo. f_strUniteGo-- ===================================================== ========================================================== ====2. New Solution (using OUTER in SQL server 2005APPLY .)Create table tb (i

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 USE DBProjectSY GO SELECTOBJECT_SCHEMA_NAME(T.[object_id], DB_ID()) AS [架构名] , T.[name] AS [表名] , AC.[name] AS [列名] , TY.[name] AS [系统数据类型] , TY.is_user_defined AS [是否用户自定义类型],--1 = 用户定义类型,0 = SQL Server 系统数据类型 AC.[max_length] [最大长度], AC.[precision] [精确度],--如果列包含的是数值，则为该列的精度；否则为0 AC.[scale] [数值范围],--如果列包含的是数值，则为列的小数位数；否则为0 AC.[is_nullab

SQL Server Performance Tuning methodology and common tools, SQL Server Tuning In earlier articles, we mentioned the DETECT methodology in Performance Tuning. Here we will briefly review the DETECT methodology. Discover the proble

SQL Server data insertion performance note, SQL Server Insert NOTE I haven't paid much attention to SQL Performance for a long time. Because the recent project neither has tens of milli

Label:The IO performance of SQL Server is affected by the IO latency of the physical disk and the IO operations performed internally by SQL Server. When monitoring disk performance, the primary measure (metric) is IO latency, whic

. 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

parameter mode, what problems the automation parameters will bring, and how to solve them.The problem itself is very simple, if you do not notice still occasionally will appear confused. Off Topic Have a little feeling very deep, that is, more and more practical problems, have to have theoretical knowledge to support,But it is often theoretically said that the situation does not appear frequently or even if there is no attention, there is time to neglect some theoretical knowledge.For the prob

very deep, that is, more and more practical problems, have to have theoretical knowledge to support,But it is often theoretically said that the situation does not appear frequently or even if there is no attention, there is time to neglect some theoretical knowledge.For the problems encountered, if you really want to find out, still have some theoretical knowledge to do the groundwork. Many times, often after encountering problems, recalled once good seems to have seen this aspect of theoretica

Original: SQL Server performance Optimization nolock, greatly improve database query performanceThe company database grows with time, the data is more and more, the query speed is also more and more slow. Into the database to see a bit, hundreds of thousands of of the data, the query is really time-consuming.To improve the query

I. Preface After the new installation of SQL Server 2005/2008, We need to configure SQL Server Based on the server's hardware and software facilities to achieve better performance. However, the default configuration is used in most cases. Ii. Configuration 1.

Tags: time interval fetch number release operation rebuild file GIF world loadThe IO performance of SQL Server is affected by the IO latency of the physical disk and the IO operations performed internally by SQL Server. When monitoring disk

The impact of Tempdb on SQL Server performance optimization and tempdb Performance Optimization First, consolidate the basic knowledge of tempdb. Introduction: Tempdb is an important part of SQLServer, which is used to store temporary objects. Tempdb is an SQL

In order to optimize the performance of Microsoft SQL Server most effectively, you must be clear about where performance will be maximized in terms of changing circumstances and focus on these aspects. Otherwise, you may spend a lot of time and effort on these issues, while perform