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Archive for the 'oracle' Category

关于Partial write for all MySQL and Oracle

Posted by admin on 2nd September 2014

很久之前看过这个帖子,当时没有细究,这几天看了下mysql相关的internal 突然想起这个问题,跟三四个朋友讨论了下 想把这个问题展开讲一讲。

源帖子内容见:https://community.oracle.com/thread/1087650?start=0&tstart=0

这个[……]

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Posted in Internals, MYSQL, oracle | No Comments »

小型机迁移x86平台之老生常谈

Posted by admin on 17th July 2014

You can view this presentation click here: x86_architect
注意使用chrome打开文件 不然可能乱码

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Posted in migration, oracle, system, unix | No Comments »

[SHOUG] 1号店Exadata应用

Posted by admin on 3rd April 2014

Download PDF: [SHOUG.LOUISLIU]Exadata在电商的实践

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Posted in Architect, Exadata, hardware, oracle | No Comments »

Oracle DGHA architecture

Posted by admin on 1st November 2013


Download this PDF

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Posted in advanced tech, Architect, network, oracle, replication | No Comments »

[转] Autotrace with bind variables

Posted by admin on 27th September 2013

JL刚刚写的一篇autotrace与bind variables 的行为:Autotrace trick
之前我们也发现过这个问题具体SR在这里:something seems confused

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Posted in Internals, oracle | No Comments »

CTAS导致严重BUG一则

Posted by admin on 25th September 2013

某国内巨头的一起CASE,在系统繁忙情况下大量的CTAS 导致数据字典表的不一致,由原来10.0.2.4版本升级到10.0.2.5之后问题依旧。
具体表现为:
1. 尝试drop这些不一致的tablespace

15:00:18 SQL> @dropts_2012.0319.150[......]

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Posted in Internals, oracle | No Comments »

Think of bind value

Posted by admin on 17th September 2013

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Posted in Internals, oracle | No Comments »

一次诡异的缓慢”死亡” CASE

Posted by admin on 13th September 2013

今天下午遇到的一个诡异CASE,现象为系统诡异的死亡,目前判定为sqluldr2工具导致 (同事使用sqluldr2 用具 执行了sqluldr2_linux64_10204.bin -help 命令)
抛出的错误如下 (/var/log/message)

Sep 11 09:00:54[......]

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Posted in Internals, oracle | No Comments »

DGHA,Dataguard自动切换方案

Posted by admin on 15th August 2013

发布对autoswitch over dg脚本DGHA测试,此脚本针对oracle dataguard设计使用共享存储存放redo以及controlfile从而达到了切换数据0丢失。
同时切换以后,original primary database可以无缝加入整个dg集群,从而形成了datagua[……]

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Posted in Architect, oracle, replication, software | No Comments »

关于12c Pluggable database注册listener问题

Posted by admin on 9th August 2013

演示一下12c中关于pdb的listener register,unregister问题

[oracle@db-42 ~]$ lsnrctl status listener1

LSNRCTL for Linux: Version 12.1.0.1.0 - Production on[......]

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Posted in 12c, network, oracle | No Comments »