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
这个帖子的内容为一个老外问oracle如何避免partial write的,也就是大家所说的半个IO问题,IO 在写到一半的时候发生断裂,(瞬间断线,瞬间crash瞬间存储或者机器故障等) 虽然这个情况极少发生,但是在非常规恢复的时候也是经常遇到的,例如某个block内部出现不一致,也就是我们所谓的逻辑[……]
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戴尔近日推出了旗下的13G服务器,其主力机型为R730xd,包含了诸多的特性,为其成为主流db server以及规模存储集群打下了良好的基础。
具体参考:http://www.storagereview.com/dell_poweredge_13g_r730xd_review
http://www.storagereview.com/dell_poweredge_gen13_servers_released
https://www.youtube.com/watch?v=YSGzB7umHa0
具体增强为:
1.CPU 为intel haswall最新架构,减少了功能[……]
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You can download webm from github: https://github.com/ylouis83/webm
webm: mysql web key performance monitor
webm is a tool that display key value graph on website and webm was developed by javascript and mysqlmon ( mysql data collection tool wrote by AnySQL)
Environment need:
Linux vers[……]
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Webm_v2 was add oracle and mongodb monitor module
webm was agent uploaded mode to save statistics
we use mysql database as monitor server
we already design tables to store these data (consider for future analysis)
you can download from github : https://github.com/ylouis83/webm[……]
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myawr-v3 release now !
history of myawr:
————————–
v1: create by noodba
mysql load information and system information
v2: create by louis liu
myawr_v2 add :
1 more os information module.
2 multiple instance support (extend table by db_port)
3 modified[......]Read more
Copy table between different hbase clusters – Version 0.96.2-hadoop2
Create test table and initial some records.
$hbase shell
2014-12-19 15:01:36,085 INFO [main] Configuration.deprecation: hadoop.native.lib is deprecated. Instead, use io.native.lib.available
HBase Shell; enter 'help<[......]Read more
演示一下12c中关于pdb的listener register,unregister问题
[oracle@db-42 ~]$ lsnrctl status listener1
LSNRCTL for Linux: Version 12.1.0.1.0 - Production on 09-AUG-2013 14:53:56
Copyright (c) 1991, 2013, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=db-42)(PORT[......]Read more
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dataguard高可用方案。
采用perl脚本定制开发,可任意部署于任何一台可连接至集群的机器(最好不要用集群中的机器做监控机),多重判断机制,从而增加了切换时的可靠性以及准确性。感谢作者 noodba. noodba作为部门数据架构师,定制开发了myawr(mysql性能分析工具)
测试环境:[……]
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By ask Surachart for help
Test: Flash Cache on 11gR2 + RHEL
A Flash Cache (11gR2) is supported by OEL or Solaris. If Want To use RHEL(Example: RHEL 5.3)
Patched 8974084 before
SQL> startup
ORA-00439: feature not enabled: Server Flash Cache
ORA-01078: failure in processing sy[......]Read more
FusionIO推出的基于共享级别的ioMemory加速方案,此文简要概述方案的一些粗略架构。ION可配选IB或者40GB以太网连接,同时支持FCoIB,FCoE,EoIB,RDMA协议。
基于FIO与HP的特殊关系,下面的图主要来自ION Accelerator on HP DL380

注意这里ION对于based server的机器是有一定要求的,对于1U的机器由于PCI插槽的限制,导致IO performace的下降是必然的。
这里的ION推出,类似模拟storage的controller机头概念,使用自己的software配合IB从而达到模拟一台普通的Server成为”存[……]
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