sql server query performance analyzer

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

andb.st_id=d.st_id andc.dep_id=d.dep_id andA.cu_name= 'English'>OK>Time:0. 002sSELECTStudent.st_name, student.class_id, student.st_id fromCourseJOINstudent_course USING (cu_id)JOINstudent USING (st_id)JOINteacher USING (dep_id)WHERECourse.cu_name= 'English'>OK>Time:0.001sAnalysis Reason:When we do not add course.cu_name = ' English ' This constraint, we compare the contents of the query results, as shown below SQL1

Windows Server 2008 R2 en enterprise 64bitSQL Server 2008 R2 en enterprise 64bit Symptom: the performance counters related to SQL Server are not displayed in Performance Monitor. Solution: Rebuilding the counters:CD c: \ window

,t.text from sys.dm_exec_query_stats as s -information about statements cross apply Sys.dm_ Exec_sql_text (S.sql_handle) as T ORDER by avgtotal Desc --Evaluation of database IO select * from Sys.dm_io_pending_io_requests --Request view of suspend IO select * from Sys.dm_io_ Virtual_file_stats ((Select db_id (' AdventureWorks2014 '), null) --function returns I/O statistics for data and log files- -The description file is suspended Select S.file_id,r.io_pending from sys.dm_io_pend

on any Member Server. System operations are the same as if each member server has a copy of the original table, but in fact each server has only one member table and a distributed partition view. The data location is transparent to the application. 11. Rebuild the index DBCC reindex, DBCC indexdefrag, shrink data and log DBCC shrinkdb, and DBCC shrinkfile. set

Server. System operations are the same as if each member server has a copy of the original table, but in fact each server has only one member table and a distributed partition view. The data location is transparent to the application. 11. Rebuild the index DBCC reindex, DBCC indexdefrag, shrink data and log DBCC shrinkdb, and DBCC shrinkfile. set automatic log

course, can also be customized, the article is described later.Look at the default collection of data collected itemsThe default template, which is divided into the query statistics, in fact, the corresponding instance state, disk storage, server activity, in addition to this gave a utility information, which is used to flexibly configure a few other collection items.You can start and stop data collection

= e.dept_no efficient Select D Ept_no, dept_name from DEPT D WHERE EXISTS (SELECT ' X ' from EMP E exists makes queries faster because the RDBMS core module returns the result immediately after the condition of the subquery is satisfied 13. Use Index to improve efficiencyAn index is a conceptual part of a table that is used to improve the efficiency of retrieving data. In fact, SQL Server us

partition table must be created. B. After creating a member table, define a distributed partition view on each Member Server, and each view has the same name. In this way, queries that reference the view name of a distributed partition can run on any Member Server. System operations are the same as if each member server has a copy of the original table, but in f

Label:Write in front: This is the first T-SQL query Advanced series article. But the T-SQL query step-up series is far from finished. This topic is advanced and I think it is because this topic requires some advanced knowledge as the basis. If there is any mistake in the article, please do not hesitate to correct me. T

Tags: SQL statement electronic win style SPAN different statement column DTS --Connect remote SQL or insert data with OPENROWSET --if only temporary access, you can directly use OPENROWSET --Query Example Select * from OpenRowset('SQLOLEDB' ,'SQL Server name';'User name

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

performance or adjusting the settings of Os,sql server, the rest of the alternatives usually have the following:1. Increase the index of the corresponding field for operations such as "scan".2. Sometimes rebuilding the index may also be valid, please refer to the following article for details.3. Adjust the structure of the statement and guide

dbo. Orders. OrderIDdbo. Orders. CustomerIDdbo. Orders. OrderDate, dbo. Orders. Summoneydbo. Orders. Finished, ISNULL(dbo. Customers. CustomerNameN'CustomerName from dbo. Left OUTER JOIN dbo. dbo. Orders. dbo. Customers. CustomerIDFor the previous sentence query, the query plan given by SQL

Before: This is the first T-SQL query advanced seriesArticleBut the advanced series of T-SQL query is far from finished. I think this topic needs some advanced knowledge as the foundation. If there are errors in this article, please do not correct it. The content of this article requires the indexing knowledge as the b

the same function, which has the least execution time. However, if the data volume in the database is small, it cannot be compared. In this case, you can view the execution plan, that is, you can obtain multiple SQL statements that implement the same function to the query analyzer, press Ctrl + L to view the indexes used for

Compare SQL query Performance statements--First Use set STATISTICS io and set STATISTICS time to see if performance tuning is valid. --set STATISTICS time on--SET STATISTICS time onBefore starting our example, run the following two commands ( do not execute on the server you

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