Switch From Testing to Oracle database
Testing is a technology and Oracle database is a product. I love both of them.
There is no conflict between the two careers and i have engaged myself into testing in the past 5-6 years mainly on test automation and performance testing. Until after i join Oracle, the greatest company, for one and half years later, i decided to switch from Testing to Oracle Database temporary.

Many Thanks to those friends who continuous help me in the past year.

Happy new year of 2009~

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Day 2
Charpter4 Recovery from non-critical losses

If critical data lost, the database can’t functional works, or else database can still works.
If loss the temp data files, drop the old one and create a new one.
Log group state current: alter system switch log will switch the log group.
Log group state active: there are data not write to data file, alter system checkpoint will flush it.
If lose redo group member, drop the old one and add a new.
If index lost, re-create a new one. Use parallel and nologging to speed up the creation.
If password file lost, use orapwd command to create a new one. Then restart the instance.
Remote_login_password_file can be set to exclusive/ shared and none

Charpter5 Database Recovery

There are two kinds of recovery: use management way and using RMAN
User management: first restore=> manually copy data file/archived file to destination
Then recover=> recover the database, that’s apply the online /archived log files
You can recover the whole database, specified data file or tablespaces.
RMAN management also finished the same task, it’s automatically: restore and recover.
Situations need incompletely recover: missing archived/online redo or use control file to recover.
Incomplete recover can recover to: until time/until cancel/until SCN/until log sequence
Incomplete recovery has to open the db with resetlogs => then log sequence start from 1
Incomplete recovery can also recover to restore point (SCN/date), need to create before restore.
Create a new control file or use control file auto backup, we can create control file from command: backup control file to trace.
If we create new control file, then need to register the backup set to control file: catalog database.
Recovery from readonly tablespace is some different.
(more…)

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Day1
Charpter1 Introduction

Oracle database review, oracle database consist of two part: instance and data. Instance is the memory and some background processes. Data is the datafile.
Memory consist of SGA and PGA and processes including SMON, PMON, DBWn(0-9), CKPT, LGWR, ARCn(0-9)
SCN should be sync in control file, data file and online redo log file.
Schema can be understand as equals to user.
Can get the tablespace and segment related information from dba_segments;, dba_tablespaces.
Data block show be continuous, but extent are not required to.

Charpter2 Configure RMAN
(more…)

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两年的时间，看看统计结果：
There are currently 402 posts and 866 comments, contained within 22 categories.

400篇文章，应该有300篇以上是纯粹技术的帖子，100篇以上原创的文字吧，开播初期分享过的一些自动化测试，性能测试，测试工具方面的原创文章，至今还有不少同行和朋友邮件过来咨询，实在是令人开心和感动的事情，800多条回复就是最好的印证，谢谢你们的关注和支持，正因为有你们默默的支持，我才一直坚持到现在。。。

访问量也曝光一下：
总量: 74604 IP （访问量） 177703 PV （浏览量）
数据可能不太准确，有部分是我自己的访问，初期的几个月没安装统计代码，所以实际结果可能在20w左右。
博客的PR值也从最初的0经过几次调整，上升到现在的4，根据Google管理员工具预测，可能很快就达到5了。

2009马上来了，期待新年朋友们的支持，我会更加努力。。。

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饭后抽空上网查了一下，这个号码的归属地居然都没有，15013144561 ~~~

年关将近，骗局越来越多，还有江东大哥发的机场大巴骗局，大家提高警惕

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昨天下班去Decathlon花300大洋入手了一款头盔，骑行更加安全

我儿子比我更帅

更多照片，猛击原图

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《福布斯》评出了全球持有现金最多10家科技公司。它们分别是：惠普(148亿美元)、苹果(119亿美元)、IBM(98亿美元)、微软(90亿美元)、戴尔(86亿美元)、甲骨文(85亿美元)、Google(84亿美元)、EMC(55亿美元)、思科(52亿美元)、英特尔(37亿美元) 。

今天看到最新消息，Sun也裁员了：
北京时间11月14日消息 据国外媒体报道，为应对全球经济的衰退，Sun公司周五宣布，将在全球范围内裁员5000至6000人，约占员工总数的15%至18%。

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今天下午下班前接到的电话是这周的第三个猎头的电话了，今天才是周三而已。其实今天说这个话题倒不是想表达我自己怎么怎么样，而是想对猎头这个职业发表自己的一点看法。

有个朋友说的好，这年头，只要你有资源，你可以不懂专业，也可以没有相关背景，甚至可以看不懂JD，可见这个行业发展多么不规范。一张办公桌，一部电话，就可以开始办公了，这不能不让人常常想到房地产中介。

现在很多的猎头公司都有各大公司的name list，得来的渠道多种多样，就不多说了。照着名单一个一个打过去，利用一些常见的沟通技巧旁敲侧击一些信息，以此对目标对象有更充分的了解。更有甚者，我遇到有猎头居然是从总机转过来的电话（总计电话当然可以在网上查到），只知道姓名，其他一概不知。更不要说对别人提出建议了。
这里头还隐藏有一个隐私和职业道德的问题了，不在此处讨论。

猎头给人的第一印象应该是有一定的行业背景，非常资深的专业人士，可以帮你规划职业的发展，提供职业的指导。现在已经沦落到这个地步，实在是挺悲哀的。

有一次跟一个猎头聊天，他居然一副非常高高在上的姿态，我们是要帮你，你为什么不感谢我们。我们是在帮你寻找更好的工作。殊不知，对有意换工作的人，这也许是对的，但是对于大多数被他们骚扰的人来说（因为他们对目标没有定位，所以一般都是骚扰性质的）是一种负担，对企业来说，也是一种非常不利的因素。客观上助长了员工的浮躁心理，说的难听点，弄得人心浮动。

说到现在的形势，就一句话：轻易不要换工作。 经济这么不景气，而且很多大公司也在裁员。猎头的生意肯定难做了，如果我没猜错的话，估计要经历重新洗牌了。这如同去年的房地产中介大批倒闭如出一辙。说来说去，又是房地产中介，呵呵。房地产中介最喜欢客户成交了，买了房，他关心你啥时候出租，啥时候卖房，啥时候换房。卖了房子，他关心你啥时候租房，啥时候买新房。这就是生意。猎头也一样，完全不关心别人的职业发展，他们只关心他们是否你更感兴趣的机会。房地产的火爆有中介的一份功劳，IT行业的浮躁和离职率，也有猎头的一份贡献啊。

欢迎不同意见。

对了，我新弄了一个招聘网站，大家有招人的需求，可以去那里发贴，猎头也欢迎哈。

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* 0: The system is at the PROM monitor (ok>) or security monitor (>) prompt. It is safe to shut down the system when it is at this init state.
* 1, s or S: This state is known as “single-user” or “system administrator” mode. Root is the only user on the system, and only basic kernel functions are enabled. A limited number of filesystems (usually only root and /usr) are mounted. This init state is often used for sensitive functions (such as kernel libc patches) or while troubleshooting a problem that is keeping the system from booting into multiuser mode.
* 2: Multiple users can log in. Most system services (except for NFS server and printer resource sharing) are enabled.
* 3: Normal operating state. NFS and printer sharing is enabled, where appropriate.
* 4: Usually undefined.
* 5: Associated with the boot -a command. The system is taken to init 0 and an interactive boot is started.
* 6: Reboot. This state takes the system to init state 0 and then to the default init state (usually 3, but can be redefined in the /etc/inittab file).
(more…)

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