ltrim rtrim performance in sql server

Requirements DescriptionIn a production environment, it is often necessary to collect data to locate a problem or to form a baseline.There are many ways to solve the data acquisition in SQL Server, such as trace, Profile, SQLdiag, extended events and so on.Several scenarios have pros and cons, with the beginning of the SQL Server2012 version, Microsoft's start to

Http://www.cnblogs.com/shanyou/archive/2013/02/12/2910232.htmlSQL Server Performance Dashboard reports is a set of Reporting Services reports that are used with reports that are described in SQL Server Management Studio. These reports allow database administrators to quickly determine if bottlenecks exist in their syst

constraints; to ensure that each inserted, updated, or deleted record meets the constraints, SQL Server needs to consider whether to add constraints to a table with a large amount of data.VarcharVARCHAR is a common type of database, but it may also lead to unexpected performance overhead. Every time we store variable-length columns,

the data is consistent, but nothing is perfect. The cost of the Begin Tran is that all the resources locked by the SQL statements cannot be released until the commit is committed before committing.It can be seen that if the BEGIN TRAN too many SQL statements, the performance of the database is poor. Before this large transaction commits, it is bound to block oth

Query OptimizerThere are rules in each field. In the simplest way, if you do not conform to the C # specification for programming, such as incorrect keyword usage, an error will be reported during compilation. Of course, there are some hidden rules in each field, and some people may say that they are "hidden rules". These rules are often not clear. For example, if you do not conform to the best practices to write a program, compilation will not report an error, but the

Long time no article, before the system officially launched, the DBA will generally test the performance of the serverFor example you have a lot of servers, some do Web server, some do cache server, some do file server, some do database serverThe server to do the database

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

Label:Original: SQL Server performance Tuning (i)--judging system resource bottleneck from waiting stateView the status of all SQL Server tasks at that time (sleeping, runnable, or running) through the DMV2005, 2008 provides the following three view Tudon detailed query:

Original: Set STATISTICS io and set STATISTICS time in SQL Server query performance optimizationIn recent times, has been exploring the SQL Server query performance issues, of course, also aimless search for a lot of information,

, and the virtual memory counters are two main: Paging file:% usage to monitor the usage ratio of Paging File instances Process:paging File Bytes to monitor the size of virtual memory The more data stored in virtual memory, the greater the gap between the amount of physical memory and the actual demand, the ratio% Usage is only as a reference value, and if the long time is close to 100%, then the system is likely to be abnormal. Second, monitor

Designing 1 of applications does not seem to be difficult, but it is not easy to achieve the optimal performance of the system. In the development tools, database design, should The structure of the program, query design, interface selection and so on have a variety of options, depending on the specific application requirements and development team skills. This article takes the SQL

Foreword: This article is to blog http://www.dbnewsfeed.com/2012/09/08/5-performance-killers-when-working-with-linked-servers/ Translation, if the translation is not good or bad place, please point out, we study progress together. Respect the original and translated labor results, please indicate the source when reproduced. Thank you!When using a linked server (Linked Servers), the most expensive cost is th

Designing an application system does not seem difficult, but it is not easy to optimize the system performance. In the development of tools, database design, should There are multiple options for application structure, query design, and interface selection, depending on the specific application requirements and the skills of the development team. This document uses SQL