sql server performance tuning best practices

mainly describes the T-SQL statement tuning from the execution plan of the following, and introduced a few common simple operators, the next one will focus on some of our most commonly used operators and tuning techniques, including: Join operators, aggregation operators, union operators, parallel operations, etc. The content of

1. Import the trace file into the tableSELECT IDENTITY (BIGINT11 as RowNumber,* into TableNamefrom fn_trace_gettable ('trace.trc'default)2. Querying for statements with large CPU overheadSELECT Top -Total_worker_time/Execution_count asAvg_cpu_cost, Plan_handle, Execution_count, (SELECT SUBSTRING(text, Statement_start_offset/2 + 1, ( Case whenStatement_end_offset= -1 Then LEN(CONVERT(nvarchar(Max),text))* 2 ELSEStatement_end_offsetEND -Statement_start_offset)/2) fro

ConclusionThis article is a bit long, but the introduction of sub-query content is not very full, follow-up slowly add on, we write a lot of SQL statements are related to sub-query, so this application is quite common. To this article about the daily tuning of the query in T-SQL frequently used by some of the operators basically introduced all, of course, t

same time, tracking different databases and tablesIf you are working with Database Engine Tuning Advisor for SQL, it's better to analyze your SQL statement performance if, and will tell you how to modify it would be better, let's have a look.How Database Engine Tuning Advis

Changing the vast majority of SQL queries to stored procedures can undoubtedly improve some performance.All operations that use "select * from xxx" are specific to the required fields.Join is used to connect more than two tables with a large amount of data, and views are used for queries with little changes to the basic data table, and indexes are created for the view. The reason is from the SQL

. server.2005. Technical Insider "series Conclusion This article first to this bar, short, easy to understand, this article mainly introduces the query plan of the joint operators, the next we analyze SQL Server parallel operations, in multicore hyper-threading gathered today, see SQL How

Brief introduction IBM WebSphere Application Server is a reliable enterprise application server that provides a set of core components, resources, and services for developers to use in their applications. Each application has unique requirements and often uses the resources of the application server in a very different way. To provide a high degree of flexibilit

which some statements in SQL Server take advantage of the index may not be clear, our next analysis of this piece, to understand the indexing method and optimization techniques, interested in advance attention, about SQL Server performance

Performance | Statement One, the problem of the proposed In the early stage of the application system development, because the development database data is few, to query the SQL statement, the complex view compilation and so on cannot realize the SQL statement various writing performance good or bad, but if the applica

, faster disk.2.5.1. Network performance evaluation（1）通过ping命令检测网络的连通性（2）通过netstat –i组合检测网络接口状况（3）通过netstat –r组合检测系统的路由表信息（4）通过sar –n组合显示系统的网络运行状态Three Linux server performance Tuning 1. Tuning the Linux kernel elevator algorithm for disk I/OWhen the file system is selected,

indicates that the file expires 24 hours after the request. Other dynamic pages that need to be processed can be called directly. 3.2, Etag Processed according to the HTTP return status. When you return 304, read directly from the cache such as etag.php Cache (); echo Date ("y-m-d h:i:s"); function Cache () { $etag = "Http://www.jb51.net"; if ($_server[' http_if_none_match '] = = $etag) { Header (' Etag: $etag, true,304); Exit } else header (' Etag: '. $etag); } ?> We know that a reasonable c

Speaking of the tuning of SQL Server, I think everyone would like to know this knowledge. I am also exploring the way, we have any good ideas, welcome to discuss and study. Win the people's long, can avoid weaknesses. This article is mainly from the programmer's SQL code, if you want to read, you can download the Inte

;=@firstSensorID and Msl.id@lastSensorIDSelectCount (1) as[motioninferred] from[Tracks]. [dbo]. [Monitorsensorlog] MSLwhereMsl. Sensortype='motioninferred'and msl.id>=@firstSensorID and Msl.id@lastSensorID End View Code 4.Union VS Union AllUnion: Sets the two result sets, excluding duplicate rows, and sorting the default rules. Union All: Set operation on two result sets, containing duplicate rows, without sorting. INTERSECT: Is the intersection of two query results for two result sets, excludin

. Linux features are rich, powerful, and flexible. You can use it to complete various tasks. In this article, we will discuss some techniques to improve the performance of Linux servers. 1. Adjust the Linux kernel elevator Algorithm for disk I/O After selecting a file system, some kernel and mount options may affect its performance. One of the kernel settings is the elevator algorithm. by adjusting the elev