以下是版工整理出的一些数据库规划、SQL performance tuning 简单心得,让长年钻研 .NET、AJAX、一堆高深 ooxx framework,却无暇研究 SQL statement 的程序员,透过最短时间对本帖的阅读,能避免踩到一些 SQL 的性能地雷。 (注:本帖的 SQL 语句皆经过测试可正常执行无误。有兴趣实验者,可直接拷贝后,
1. SQL Performance Tuning team recommends using COUNT(1) instead COUNT(*) for SQL query performance optimization. Example: --Do not use: SELECT COUNT(*) FROM master; --Use: SELECT COUNT(1) FROM master; 2. Never compare NULL with NULL. Consider that NULL is not like an empty string or...
以下是版工整理出的一些数据库规划、SQL performance tuning 简单心得,让长年钻研 .NET、AJAX、一堆高深 ooxx framework,却无暇研究 SQL statement 的程序员,透过最短时间对本帖的阅读,能避免踩到一些 SQL 的性能地雷。 (注:本帖的 SQL 语句皆经过测试可正常执行无误。有兴趣实验者,可直接拷贝后,粘贴至 SQL S...
Application code problems cause slowdowns and timeouts: data type mismatches, server side cursors, result set, execution plans, long duration locks and SQL Server functions used the wrong way. Call our SQL Tuning Server Performance Experts for solutions to your performance problems. SQL Server- ...
Many new SQL performance tuning features are added to SQL Server in each new version. In some cases, these features might boost our query performance dramatically. For this reason, it will always be useful for us to be informed about these new features. Such as the following features are ver...
Use Response Time Analysis for SQL performance tuning Response Time Analysis enables database administrators (DBAs) to measure time spent on query execution and, therefore, the impact on end-users. The Response Time Analysis feature in SolarWinds® Database Performance Analyzer (DPA) is built to...
SQL Tuning: Avoid Coding Loops Imagine a scenario in which 1000 queries hammer your database in sequence. Something like: for (int i=0; i < 1000; i++){ SqlCommand cmd=new SqlCommand("INSERT INTO TBL (A,B,C) VALUES...");cmd.ExecuteNonQuery();} ...
(2)进入MySQL里查看MySQL的连接数及相应的SQL(show processlist) (3)如果使用的innodb表还需要把show engine innodb status取出来分析 (4)取两次show global status,间隔5到10秒用于分析 (5)查看慢日志及相应慢日志内容分析 当发现性能瓶颈以后,我们如何解决呢?无非也就是下面的几种方法(当然或许还有更多) ...
Issue/Introduction SQL Server Implementation Best Practices and Performance Tuning for IT Management Suite (ITMS)Environment ITMS 8.xResolution This article consolidates best practices for SQL Server 2005 or later server implementation. It also presents a simplistic process that can be used to tune ...
As a Database Administrator (DBA), you are constantly challenged about how to improve, optimize, and maintain the performance of the database and SQL server. SQL performance tuning is one of the ways to improve and optimize the performance. All your performance related queries are answered when...