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JAVA高性能程序开发、性能调优、Performance Tuning、JVM调优、Mysql优化、算法、linux | javaranger.com Reviews

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JAVA高性能程序开发、性能调优、Performance Tuning、JVM调优、Mysql优化、算法、linux

JavaRanger – 专注JAVA WEB高性能程序开发、JVM、Mysql优化、业务架构. JAVA是使人内心宁静的语言 – http:/ javaranger.com. 一、区分App Store、iTunes Store、Apple Store. App Store 是苹果公司经营的应用商店,供iPhone、iPod Touch、iPad以及Mac等设备的用户下载各种应用程序。 Apple Store 是苹果公司经营的线下实体连锁零售商店,以展示和销售iPhone、iPod Touch、iPad以及Mac等电脑和消费电子产品为主,并提供各种售后服务。 Command shift S 另存为. Command Q 退出 小编编最喜欢用的快捷键,关一堆应用不能更爽. Command V 粘贴 用习惯windows的宝宝,应该能看出来Command就相当于Ctrl. Command shift delete 清空回收站. Command shift 3 截取整个屏幕 这个非常有用 截图在 Finder-我的所有文件 就能找到,从此告别QQ截图. Command shift 4 截取选择区域.

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简介 | JVM必知必会

X300A;JVM必知必会》. X8FD9;里记录的是本人对JVM的总结及学习笔记,如有不足或错误请到 http:/ www.javaranger.com. X7559;言,一经确认,立即修正. X76EE;前的内容还比较零碎,我会慢慢的做系统整理,希望这里的内容能对你产生帮助. X76EE;标读者. X76EE;前还是入门级. X7248;权问题. X5982;果发现本文章有版权侵犯行为,请联系我。 X8054;系方式. X5FAE;博: http:/ weibo.com/shangdiren. X535A;客 ranger.

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JAVA高性能程序开发、性能调优、Performance Tuning、JVM调优、Mysql优化、算法、linux

JavaRanger – 专注JAVA WEB高性能程序开发、JVM、Mysql优化、业务架构. JAVA是使人内心宁静的语言 – http:/ javaranger.com. 一、区分App Store、iTunes Store、Apple Store. App Store 是苹果公司经营的应用商店,供iPhone、iPod Touch、iPad以及Mac等设备的用户下载各种应用程序。 Apple Store 是苹果公司经营的线下实体连锁零售商店,以展示和销售iPhone、iPod Touch、iPad以及Mac等电脑和消费电子产品为主,并提供各种售后服务。 Command shift S 另存为. Command Q 退出 小编编最喜欢用的快捷键,关一堆应用不能更爽. Command V 粘贴 用习惯windows的宝宝,应该能看出来Command就相当于Ctrl. Command shift delete 清空回收站. Command shift 3 截取整个屏幕 这个非常有用 截图在 Finder-我的所有文件 就能找到,从此告别QQ截图. Command shift 4 截取选择区域.

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JAVA高性能程序开发、性能调优、Performance Tuning、JVM调优、Mysql优化、算法、linux

JavaRanger – 专注JAVA高性能程序开发、JVM、Mysql优化、算法. JAVA是使人内心宁静的语言 – http:/ www.javaranger.com. Explain select …. 例如: explain select * from user where name=’ranger’. Mysql explain select * from user where name=’ranger’ G. 1 row * * * * * * * * * * * * * *. Possible keys: uniq name. 1 row in set (0.01 sec). SELECT语句的ID编号,优先执行编号较大的查询,如果编号相同,则从上向下执行. Mysql explain select * from (select * from ( select * from share where id =11) a) b;. Id select type table type possible keys key key len ref rows Extra. 8212;- —...

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JavaRanger – 专注JAVA WEB高性能程序开发、JVM、Mysql优化、业务架构. JAVA是使人内心宁静的语言 – http:/ javaranger.com. Elasticsearch报Result window is too large问题处理. Wget下载文件Can not write to和File name too long的问题. Java6,7,8中的String.intern() 字符串常量池. Bye 2015, hello 2016. JVM致命错误日志 hs err pid.log 解读. IntelliJ idea 配置 jdk. IntelliJ IDEA 14 注册码生成. Show processlist命令详解 的评论" 0. Mybatis报错invalid types () or values ()解决方法. 信号量 semaphore 和互斥锁 mutex 的区别. 超级好用的hosts,可上google,gmail,youtube(1月30日更新). Ubuntu 14.04 安装搜狗输入法. IntelliJ IDEA 12 序列号.

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MySQL导出导入数据 | JavaRanger - 专注JAVA WEB高性能程序开发、JVM、Mysql优化、业务架构

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JavaRanger – 专注JAVA WEB高性能程序开发、JVM、Mysql优化、业务架构. JAVA是使人内心宁静的语言 – http:/ javaranger.com. 8211;add-drop-database 在每次执行建表语句之前,先执行DROP TABLE IF EXIST语句. 8211;no-create-db 不输出CREATE DATABASE语句. 8211;no-create-info 不输出CREATE TABLE语句. 8211;tables 第一个参数为库名 后续为表名. Mysqldump -u$USER -p$PASSWD -h127.0.0.1 -P3306 –routines –default-character-set=utf8 –lock-all-tables –add-drop-database -A alldb.sql. Mysql -u$USER -p$PASSWD -h127.0.0.1 -P3306 –default-character-set=utf8 –skip-column-names -B ...Mysql -u$USER -p$PASS...

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JavaRanger – 专注JAVA WEB高性能程序开发、JVM、Mysql优化、业务架构. JAVA是使人内心宁静的语言 – http:/ javaranger.com. Java6,7,8中的String.intern() 字符串常量池. 你能通过自定义的Map String, String 根据需要实现软引用或弱引用 并且使用map中的值作为标准值来实现这一目标。 在下面的网址可以看到详细介绍 http:/ bugs.sun.com/view bug.do? Bug id=6962931 and http:/ bugs.sun.com/view bug.do? 基本类型包括 byte,short,int,long,char,float,double,Boolean,returnAddress. 当我们把对象拆开,你会发现,对象的属性其实就是数据,存放在堆中 而对象的行为 方法 ,就是运行逻辑,放在栈中。 Java -Xmx3800m -Xms3800m -Xmn2g -Xss128k -XX: UseParallelGC -XX:ParallelGCThreads=20. Java VM: J...

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JavaRanger – 专注JAVA WEB高性能程序开发、JVM、Mysql优化、业务架构. JAVA是使人内心宁静的语言 – http:/ javaranger.com. 2去线上dump内存看是什么对象,用memory analyzer分析,Retained Size竟然有2.4G,全是sun.awt.SunToolkit这个对象,其实到这一步已经可以确定是什么问题了,只是自己对系统不是很熟悉,导致定位具体的问题代码花了一些时间. Public static Image getImage(String path) {. ImageIcon icon = new ImageIcon(path);. Image img = icon.getImage();. Iterator readers = ImageIO.getImageReadersByFormatName(StringUtil.getFileSuffix(filePath) ;. ImageReader reader = (ImageReader)readers.next();. 2016 年 1 月 24 日 at 下午 9:10.

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mysql explain详解 | JavaRanger - 专注JAVA WEB高性能程序开发、JVM、Mysql优化、业务架构

http://www.javaranger.com/archives/1614

JavaRanger – 专注JAVA WEB高性能程序开发、JVM、Mysql优化、业务架构. JAVA是使人内心宁静的语言 – http:/ javaranger.com. Explain select …. 例如: explain select * from user where name=’ranger’. Mysql explain select * from user where name=’ranger’ G. 1 row * * * * * * * * * * * * * *. Possible keys: uniq name. 1 row in set (0.01 sec). SELECT语句的ID编号,优先执行编号较大的查询,如果编号相同,则从上向下执行. Mysql explain select * from (select * from ( select * from share where id =11) a) b;. Id select type table type possible keys key key len ref rows Extra. 8212;- &#821...

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七月 30TH, 2014. 八月 1, 2014 @ 9:51 下午. 我觉得还应该补充一点 时间管理 或 任务管理。 Reply on 八月 2nd, 2014. 八月 5, 2014 @ 3:19 下午. 八月 6, 2014 @ 1:53 下午. 九月 4, 2014 @ 8:48 上午. 十月 9, 2014 @ 9:12 下午. Reply on 十月 11th, 2014. Other Links to this Post. Laputa – 远方地平线,闪耀着光芒. Deuter多特36527 Kid Comfort III 婴儿背架开箱文.

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Use the form on the right to contact us. You can edit the text in this area, and change where the contact form on the right submits to, by entering edit mode using the modes on the bottom right. 114 E Main St. Fredericksburg, TX, 78624. Check us out on Instagram at @javaranchfbg. Java Ranch Espresso Bar and Cafe - Fredericksburg. Java Ranch Espresso Bar and Cafe - Fredericksburg. Welcome to the Java Ranch Espresso Bar and Café. 114 East Main Street Fredericksburg, TX 830.990.4517.

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JavaRanger – 专注JAVA WEB高性能程序开发、JVM、Mysql优化、业务架构. JAVA是使人内心宁静的语言 – http:/ javaranger.com. 1直接使用用limit start, count分页语句. Select * from order limit start, count. 当起始页较小时,查询没有性能问题,我们分别看下从10, 100, 1000, 10000开始分页的执行时间 每页取20条 , 如下. Select * from order limit 10, 20 0.016秒. Select * from order limit 100, 20 0.016秒. Select * from order limit 1000, 20 0.047秒. Select * from order limit 10000, 20 0.094秒. Select * from order limit 400000, 20 3.229秒. Select * from order limit 800000, 20 37.44秒. Public class Something {.

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