With MySQL, common configuration mistakes can cause serious performance problems. In fact, if you mis-configure just one of the many config parameters, it can cripple performance! (see examples) Of course, the performance of MySQL is often tied great…

MySQL performance tuning primer script一个简单好用的mysql优化工具,其实一个shell脚本 下载: $ wget http://www.day32.com/MySQL/tuning-primer.sh 运行 $ sh tuning-primer.sh all 运行以后会询问mysql用户名好密码最好提供mysql的,还会询问是否在当家目录自动生成.my.cnf配置文件这里保存你的mysql用户名和密码一般选择N. 它主要通过查询mysql中的variab…

1.表级锁状态 mysql> show status like 'table%'; +----------------------------+-----------+ | Variable_name              | Value     | +----------------------------+-----------+ | Table_locks_immediate      | 139306577 |     | Table_locks_waited         | 0…

Table of Contents Analyze MySQL PerformanceTuningSlow queries and Slowlog Brought to you by Rick James Analyze MySQL Performance When asked to analyze the performance of a MySQL server, there are two main tasks (tuning and slowlog) I like to start wi…

Bruce Momjian POSTGRESQL is an object-relational database developed on the Internet by a group of developers spread across the globe. It is an open-source alternative to commercial databases like Oracle and Informix. POSTGRESQL was originally develop…

1.2性能调优特性和工具 Effective data collection and analysis isessential for identifying and correcting performance problems. Oracle providesa number of tools that allow a performance engineer to gather informationregarding database performance. In addition t…

老李分享: Oracle Performance Tuning Overview 翻译   poptest是国内唯一一家培养测试开发工程师的培训机构,以学员能胜任自动化测试,性能测试,测试工具开发等工作为目标.如果对课程感兴趣,请大家咨询qq:908821478,咨询电话010-84505200. 1 性能优化概述 This chapter provides an introduction toperformance tuning and contains the following secti…

http://msdn.microsoft.com/en-us/library/windows/hardware/jj248719.aspx This guide describes important tuning parameters and settings that you can adjust to improve the performance and energy efficiency of the Windows Server 2012 operating system. It…

本文译自Wikipedia的Performance tuning词条,原词条中的不少链接和扩展内容非常值得一读,翻译过程中暴露了个人工程学思想和英语水平的不足,翻译后的内容也失去很多准确性和丰富性,需要在之后的时间继续细读. Performance Tuning特指计算机系统的性能优化工作.它通常是根据某个现实或潜在的性能问题而发起的.绝大部分系统都会因为负载的升高而导致性能下降,一个系统对于负载的可承受能力称为可扩展性(scalability),调整系统使其可以承受更大的负载就是perform…

Spark SQL 之 Performance Tuning & Distributed SQL Engine 转载请注明出处:http://www.cnblogs.com/BYRans/ 缓存数据至内存(Caching Data In Memory) Spark SQL可以通过调用sqlContext.cacheTable("tableName") 或者dataFrame.cache(),将表用一种柱状格式( an in­memory columnar format)缓存至内…