sql performance counters

SQL Server performance optimization involves many aspects, such as good system and database design, high-quality SQL writing, appropriate data table index design, and even various hardware factors: network performance, server performance, operating system

SQL Server query performance optimization analysis transactions and locks (I) SQL Server query performance optimization analysis transactions and locks (ii) SQL Server query performance optimization analysis transactions and locks

Always want to find some of the SQL statement performance debugging authoritative reference, but there is no reference may not be able to do debugging 2 of the work. I am convinced that the experience gained in practice is the most precious, and that book knowledge is only a guide. This article is from "Inside Microsoft SQL Server 2008", the experienced master de

This article describes the adaptive server system through the Sp_sysmon of the operation of a comprehensive system to understand, is conducive to better understanding of system performance, more effective system management, rational use and allocation of system resources, to achieve system performance tuning purposes. Learn from 18 aspects of the performance of

Original link: http://isky000.com/database/mysql-performance-tuning-sqlNote: This article is based on MySQL, many of which apply to other relational databases at the same time, need some index knowledge as the basis Optimize your Goals Reduce the number of IOIo is always the most vulnerable to the database, which is determined by the responsibility of the database, most of the database operations more than 90% of the time is occupied b

complex, it can make SQL statements very difficult to read if too many layers are nested.Read and maintain. Therefore, you can also use table variables to solve this problem.The SQL statements are as follows:Insert into @t (Countryregioncode) Although the above SQL statement is more complex than the first, it puts the subquery in the table

/50455543Introduction: Since this has become a problem, it is necessary to first understand the waiting status of SLEEP_BPOOL_FLUSH. In Microsoft official note: https://technet.microsoft.com/zh-cn/library/ms179984 (v = SQL .105). aspx, only a simple description: when a checkpoint suspends a new I/O release to avoid disk subsystem flooding. Obviously, this explanation is insufficient. Therefore, I have rummaged through the blogs and other books of Dani

]. [CustID]) As RowNumber from Sales.customers SC) SELECT [address], [City], [region] from salecustomer WHERE RowNumber > @StartRow and RowNumber Let's take a look at whether the two use SQL query statements and views have no performance differences? Come on, the test is. From here we can see that the two are not different in terms of performance costs,

Label:MySQL Bulk SQL Insert performance optimizationsPosted by Kiki TitaniumOn December 7, 2012 For some systems with large data volume, the problem of database is not only inefficient, but also the data storage time is long. Especially like a reporting system, the time spent on data import every day can be as long as a few hours or more than 10 hours. Therefore, it makes sense to optimize database inser

Label:Reprint Link: http://www.cnblogs.com/knowledgesea/p/3683505.htmlOverview of ToolsIf you have a database application system, there are a large number of tables, views, indexes, triggers, functions, stored procedures, SQL statements, and so on, and the performance of the poor, and the bitter you have to optimize it, then what should you do? Brother teaches you, first you need to know where the problem i

Performance five ways to improve SQL performance Johnny Papa Sometimes, in order for the application to run faster, the whole point of doing so is to make some minor adjustments here or there. Ah, but the key is to determine how to adjust! Sooner or later, you'll experience a situation where SQL queries in your applic

index Ix_gender, however, we write SQL very little, more we will write such sql:select userid,username,phone,email from Users where gender= ' Male ' then go to see the query plan does not use the index Ix_gender, but did a clustered Index scan or table scan, query conditions where gender= ' male ' clearly defined in Ix_gender, why not use it, The root of all this sin is bookmark lookup (RID, key Lookup), okay. Bookmark Lookup is not the topic we want

Tags: causes 1.7 read data to execute disk has one other build multipleThe focus of performance optimization is to identify location problems, get a better understanding of the major performance killers, and be able to pinpoint problems faster and focus on the possible causes. The SQL Server performance killers are ma

, and spikes in CPU and memory resource consumption occur on the server. System structure The performance problem stems from the whole structure and development process of the system. The application of the Olite system is a Web Form program based on the. NET platform, and the database is SQL Server 2005. Its main structure is as follows: Its application end consists of two sites: Olitebase and Olitereport

Sometimes, all you do to make the application run faster WorkMake some minor adjustments here or there. But the key lies in determining how to adjust it! Sooner or later, you will encounter this situation: SQLThe query cannot respond as you want. It either does not return data or takes a surprising amount of time. If it reduces the speed of enterprise applications, users must wait for a long time. Users want their applications to respond quickly and their reports can return analysis data instant

speed is 100 times times more, Io from 100% to less than 1%Test on SSD machine, optimize before 7s, optimize the first 0.3s, second 0.1s, optimized execution speed is 10 times times more, Io from 100% to less than 1%As you can see, pre-optimization disk IO is a performance bottleneck, the SSD is significantly faster than SATA, the disk is no longer a bottleneck after optimization, and SSD and SATA performance