ILLEGALACCESS.COM

Jimmy Lee Notes

Take notes, Reading. Work hard, enjoy life, make history. Spring jpa version:1.10.1. 底层hibernate: 5.1.0. 某些情况需要自行写sql,然后就用到了EntityManager, 用完之后没有显示的close(= ). 首先确定不是数据库正在的查询慢,目前量还很小,然后找到sql去数据库查询系统确认,查询速度接近0ms. 然后怀疑是网络延迟,然后找到接收到前端传递过来的参数,想让前端查查log他们发送的时间点,没人搭理无果. 找运维同学要了份error log,一看,果然不是网络问题,大量报获取不到数据库链接,等待获取连接超时,当时心一惊. 想着用的spring jpa,底层使用的数据库链接应该会自动释放啊,找dba看了下应用系统连到数据库的活跃连接数,果然每个应用的连接数都到了最大值. 想了想,有地方用了EntityManager,找到使用的地方一看,没有手动关闭,哎. 没有任何技术含量,给自己的一个提醒,用惯了自动释放连接,以后得多注意. 一个表字段叫status,值是1,2,3,4,5,6,7,8,9.

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Take notes, Reading. Work hard, enjoy life, make history. Spring jpa version:1.10.1. 底层hibernate: 5.1.0. 某些情况需要自行写sql,然后就用到了EntityManager, 用完之后没有显示的close(= ). 首先确定不是数据库正在的查询慢,目前量还很小,然后找到sql去数据库查询系统确认,查询速度接近0ms. 然后怀疑是网络延迟,然后找到接收到前端传递过来的参数,想让前端查查log他们发送的时间点,没人搭理无果. 找运维同学要了份error log,一看,果然不是网络问题,大量报获取不到数据库链接,等待获取连接超时,当时心一惊. 想着用的spring jpa,底层使用的数据库链接应该会自动释放啊,找dba看了下应用系统连到数据库的活跃连接数,果然每个应用的连接数都到了最大值. 想了想,有地方用了EntityManager,找到使用的地方一看,没有手动关闭,哎. 没有任何技术含量,给自己的一个提醒,用惯了自动释放连接,以后得多注意. 一个表字段叫status,值是1,2,3,4,5,6,7,8,9.

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Jimmy Lee Notes | illegalaccess.com Reviews

https://illegalaccess.com

Take notes, Reading. Work hard, enjoy life, make history. Spring jpa version:1.10.1. 底层hibernate: 5.1.0. 某些情况需要自行写sql,然后就用到了EntityManager, 用完之后没有显示的close(= ). 首先确定不是数据库正在的查询慢,目前量还很小,然后找到sql去数据库查询系统确认,查询速度接近0ms. 然后怀疑是网络延迟,然后找到接收到前端传递过来的参数,想让前端查查log他们发送的时间点,没人搭理无果. 找运维同学要了份error log,一看,果然不是网络问题,大量报获取不到数据库链接,等待获取连接超时,当时心一惊. 想着用的spring jpa,底层使用的数据库链接应该会自动释放啊,找dba看了下应用系统连到数据库的活跃连接数,果然每个应用的连接数都到了最大值. 想了想,有地方用了EntityManager,找到使用的地方一看,没有手动关闭,哎. 没有任何技术含量,给自己的一个提醒,用惯了自动释放连接,以后得多注意. 一个表字段叫status,值是1,2,3,4,5,6,7,8,9.

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illegalaccess.com

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http://illegalaccess.com/2016/12/07/general-command

Take notes, Reading. Query cache min res unit. Query cache wlock invalidate. 支持的语言 actionscript, apache, bash, clojure, cmake, coffeescript, cpp, cs, css, d, delphi, django, erlang, go, haskell, html, http, ini, java, javascript, json, lisp, lua, markdown, matlab, nginx, objectivec, perl, php, python, r, ruby, scala, smalltalk, sql, tex, vbscript, xml. Site powered by Jekyll. Theme designed by HyG.

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entity manager close

http://illegalaccess.com/2017/03/24/entity-manager

Take notes, Reading. Spring jpa version:1.10.1. 底层hibernate: 5.1.0. 某些情况需要自行写sql,然后就用到了EntityManager, 用完之后没有显示的close(= ). 首先确定不是数据库正在的查询慢,目前量还很小,然后找到sql去数据库查询系统确认,查询速度接近0ms. 然后怀疑是网络延迟,然后找到接收到前端传递过来的参数,想让前端查查log他们发送的时间点,没人搭理无果. 找运维同学要了份error log,一看,果然不是网络问题,大量报获取不到数据库链接,等待获取连接超时,当时心一惊. 想着用的spring jpa,底层使用的数据库链接应该会自动释放啊,找dba看了下应用系统连到数据库的活跃连接数,果然每个应用的连接数都到了最大值. 想了想,有地方用了EntityManager,找到使用的地方一看,没有手动关闭,哎. 没有任何技术含量,给自己的一个提醒,用惯了自动释放连接,以后得多注意. 上一篇 mysql order by. Site powered by Jekyll. Theme designed by HyG.

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illegalaccess.com

Jimmy Lee Notes

Take notes, Reading. Work hard, enjoy life, make history. Spring jpa version:1.10.1. 底层hibernate: 5.1.0. 某些情况需要自行写sql,然后就用到了EntityManager, 用完之后没有显示的close(= ). 首先确定不是数据库正在的查询慢,目前量还很小,然后找到sql去数据库查询系统确认,查询速度接近0ms. 然后怀疑是网络延迟,然后找到接收到前端传递过来的参数,想让前端查查log他们发送的时间点,没人搭理无果. 找运维同学要了份error log,一看,果然不是网络问题,大量报获取不到数据库链接,等待获取连接超时,当时心一惊. 想着用的spring jpa,底层使用的数据库链接应该会自动释放啊,找dba看了下应用系统连到数据库的活跃连接数,果然每个应用的连接数都到了最大值. 想了想,有地方用了EntityManager,找到使用的地方一看,没有手动关闭,哎. 没有任何技术含量,给自己的一个提醒,用惯了自动释放连接,以后得多注意. 一个表字段叫status,值是1,2,3,4,5,6,7,8,9.

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