db2 performance tuning

index on the query statement is usually dozens of times better. Therefore, you can check the index utilization of related statements before tuning. This allows you to check SQL statements and execution plans to see if existing indexes are used or whether new indexes need to be created. This is often more important than DB2 system tuning. But remember to consider

higher, 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, the algorithm balances low latency re

To improve system performance, developers can optimize the system from every angle and level of the system. In addition to the most common code optimizations, the software architecture, the JVM virtual machine layer, the database, and the operating system layer can be tuned in a variety of ways to improve overall system performance.Design TuningDesign tuning is at the top of all

The topics in this chapter are as follows: General performance tuning process Analyze page loading information using analysis tools Analyze performance bottlenecks using analysis tools General performance tuning process Before solving the

use than the previous system (see the "Joy of Success" section of the relevant content). These examples illustrate one point: the efficiency of PureXML data storage, the speed of response, and the flexibility of querying XML data are good. Best practices IBM has done a lot to improve XML performance, especially in response to the increase in data volume and query complexity, but like all data management systems, PureXML needs good settings and som

Brief introductionWeb development often encounters performance issues, especially Web 2.0 applications. CSS code is the most direct "tool" to control the display style and effect of the page, but they are often overlooked by WEB development engineers when it comes to performance tuning, while the fact that nonstandard CSS can have a serious impact on the efficien

Linux Performance Tuning Overview -What is performance tuning? (What)-Why performance optimization? (Why)-When do I need performance optimization? (When)-Where do I need performance

range. That doesn't make sense either. For performance testing, we also need to define a time period. For example, it lasts 15 minutes on a certain throughput. Because the system becomes unstable when the load arrives, the system will stabilize after a two-minute time. In addition, it is possible that your system behaves normally in the first few minutes of the load, and then it is unstable and even collapsed. So it takes so long. This value, we