视频教学 Oracle常见错误ORA-12541 TNS-12541 No listener
【视频教学】Windows上Oracle ORA-12560报错的解决
2015/04/04 by Leave a Comment
视频教学 Windows上Oracle ORA-12560报错的解决
【视频教学】Oracle常见初学者问题ORA-12154 TNS:监听程序无法识别连接描述符中请求的服务的解决
2015/04/04 by Leave a Comment
视频教学 Oracle常见初学者问题ORA-12154 TNS:监听程序无法识别连接描述符中请求的服务 的解决
我是如何准备11g OCM考试的
2015/03/30 by Leave a Comment
By Laurent
这里我描述下我如何准备11g Oracle数据库 OCM认证考试的。根据我与Oracle所签署的保密条款，我将不会提供任何考试内容方面的细节，敬请见谅。
我参加的是11g OCM考试，注意不是升级考试(如果你希望了解升级考试方面的信息，你可以访问以下页面：http://laurentschneider.com/wordpress/2012/09/ocm-11g-upgrade.html)
当然，相关的信息也仅是关于我的准备工作而并非基于考试内容。
在做准备前，你需要访问Oracle关于考试的相关网页并仔细留意：
- “考试环境”信息，建立一个和你考试时相近的实验环境。
- “考试内容”信息，了解你需要熟练掌握的考点。
之后，我使用Oracle Enterprise Linux 5.4 64bits 介质建立了许多虚拟机。我还记得当时我大致建了以下虚拟服务器：
- 一个带有5个ASM磁盘的Oracle服务器，其上安装了Oracle数据库和GI网格基础组件。
- 一个网络文件存储NFS服务器用于Oracle软件的临时存储。作为NFS服务器来实现直连 在其他所有服务器上都有一个此存储的临时挂载点。
- 一个带有版本11.1.0.6数据库仓的Grid Control服务器。
- 2个Data Guard服务器用于streams配置
- 带有ASM共享磁盘的3个RAC服务器（我记得，我配了10个共享磁盘）
好了，之后我开始针对考试内容进行练习。对每个考点，尝试通过使用命令行模式和图形化环境两种方式进行配置和管理。
对于每个考点，你需要进行细致地研究，需要想象一些可能的情况，并尝试练习，这会帮助你避免一些陷阱。如果可以的话，找同事一起来考你吧。我确实找了个好同事，他会让我做一些数据库操作，建立一些刁钻麻烦的灾难恢复场景，我需要自己去在特定时间下修复数据库。总之记住，想要通过考试，你需要：“实践，实践，实践。。。更多地实践“。
考试那天，一切就绪，时间过得很快，也很安静。如果你准备得不错，那么我想不会有啥问题的。考试的时候，你被允许使用一份官方oracle非在线文档。你需要熟练得使用它，快速定位考试主题并找到相关信息。
在参加完考试后，考试结果会在2到3周后以电子邮件形式发给你。如果你通过了，你就能在OTN网上提交你简历上“名人堂“啦。
Oracle 甲骨文大学三月最新讯息
2015/03/24 by Leave a Comment
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预约MongoDB university的DBA认证考试
2015/03/24 by 2 Comments
诗檀软件 MongoDb学习群 421431253
现在MongoDB university提供DBA认证考试课程：
SCHEDULE
| EXAM | START | END | REGISTER |
|---|---|---|---|
| C100DEV: MongoDB Certified Developer Associate Exam | Apr 21, 2015 | Apr 28, 2015 | REGISTER |
| C100DBA: MongoDB Certified DBA Associate Exam | Apr 21, 2015 | Apr 28, 2015 | REGISTER |
| C100DBA: MongoDB Certified DBA Associate Exam | Jul 21, 2015 | Jul 28, 2015 | Opens Apr 28, 2015 |
| C100DEV: MongoDB Certified Developer Associate Exam | Jul 21, 2015 | Jul 28, 2015 | Opens Apr 28, 2015 |
| C100DBA: MongoDB Certified DBA Associate Exam | Oct 20, 2015 | Oct 27, 2015 | Opens Jul 28, 2015 |
| C100DEV: MongoDB Certified Developer Associate Exam | Oct 20, 2015 | Oct 27, 2015 | Opens Jul 28, 2015 |
| C100DBA: MongoDB Certified DBA Associate Exam | Jan 19, 2016 | Jan 26, 2016 | Opens Oct 27, 2015 |
| C100DEV: MongoDB Certified Developer Associate Exam | Jan 19, 2016 | Jan 26, 2016 | Opens Oct 27, 2015 |
用户可以点击上面的REgister来预约网上考试。 考试分成 Developer Associate (C100DEV) 和 DBA Associate（C100DBA) 2种， Maclean选择的是 DBA Associate DBA专员， 考试费用为150美元。
完成上述注册后，可以通过信用卡支付。 之后会被重定向到prod.examity.com/Mongodb 考试预约网站预约具体的考试时间， 需要先完成用户profile信息填写后具体schedule 时间。
C100DBA 的考纲如下：
Exam Details
- This exam is based on MongoDB 2.6.
- There are no prerequisites. Anyone may take the exam but we do recommend you take an in-person training or M102 and M202. Test takers should also make use of other recommended preparation materials.
- MongoDB certification exams are delivered online using a web proctoring solution.
- Complete the Computer Readiness Check to ensure your system meets the necessary hardware and software requirements to complete an exam.
- To take the exam, you must schedule an exam session with our proctoring partner, Examity. Once you have registered for the exam, you will receive scheduling instructions.
- You may complete the exam at any time, day or night between the start and end dates.
- Test takers have 90 minutes to complete an exam.
- There is no penalty for incorrect answers.
- Exam scores are based on the number of correct answers with an adjustment made for the overall difficulty of the exam as determined by the data and expert assessment.
- Exam question types are multiple choice and check all that apply.
- Exam results will be available within 3 weeks following the close of the exam period. We need time to review any questions raised by the proctors and calculate exam results.
- Please note that we are no longer including a free retake with the exam fee.
Required MongoDB Knowledge
- Philosophy & Features: performance, JSON, BSON, fault tolerance, disaster recovery, horizontal scaling, and the Mongo shell
- CRUD: Create, Read, Update, and Delete operations
- Indexing: single key, compound, multi-key, mechanics, and performance
- Aggregation: pipeline, operators, memory usage, sort, skip, and limit
- Replication: configuration, oplog concepts, write concern, elections, failover, and deployment to multiple data centers
- Sharding: components, when to shard, balancing, shard keys, and hashed shard keys
- Application Administration: data files, journaling, authentication, and authorization
- Server Administration: performance analysis, diagnostics and debugging, maintenance, backup, and recovery
C100DEV的考纲如下：
ABOUT THE EXAM
The MongoDB Certified Developer, Associate Level exam is intended for individuals with knowledge of the fundamentals of designing and building applications using MongoDB. We recommend this certification for software engineers who have a solid understanding of MongoDB fundamentals and some professional experience developing applications with MongoDB. The knowledge and skills required for certification are detailed below.
Exam Details
- This exam is based on MongoDB 2.6.
- There are no prerequisites. Anyone may take the exam but we do recommend you complete an in-person training or one of the following online courses: M101J, M101JS, M101N, or M101P. Test takers should also make use of other recommended preparation materials.
- MongoDB certification exams are delivered online using a web proctoring solution.
- Complete the Computer Readiness Check to ensure your system meets the necessary hardware and software requirements to complete an exam.
- To take the exam, you must schedule an exam session with our proctoring partner, Examity. Once you have registered for the exam, you will receive scheduling instructions.
- You may complete the exam at any time, day or night between the start and end dates.
- Test takers have 90 minutes to complete an exam.
- There is no penalty for incorrect answers.
- Exam scores are based on the number of correct answers with an adjustment made for the overall difficulty of the exam as determined by the data and expert assessment.
- Exam question types are multiple choice and check all that apply.
- Exam results will be available within 3 weeks following the close of the exam period. We need time to review any questions raised by the proctors and calculate exam results.
- Please note that we are no longer including a free retake with the exam fee.
Required MongoDB Knowledge
- Philosophy & Features: performance, JSON, BSON, fault tolerance, disaster recovery, horizontal scaling, and the Mongo shell
- CRUD: Create, Read, Update, and Delete operations
- Data Modeling: embedding, references, document growth, modeling one-to-one and one-to-many relationships, modeling for atomic operations, modeling tree structures
- Indexing: single key, compound, multi-key, mechanics, and performance
- Aggregation: pipeline, operators, memory usage, sort, skip, and limit
- Replication: configuration, oplog concepts, write concern, elections, failover, and deployment to multiple data centers
- Sharding: components, when to shard, balancing, shard keys, and hashed shard keys
