oca ocp

/oracle/courses/dba/dba.htm 5. The teacher first gives examples of commonly used relational databases, such as SQL Server, DB2, Sybase, and Oralce, and also says that non relational databases are also useful, such as access that we know well. Then introduced the C/s structure, I think these people are familiar with, I will not repeat. 6. The teacher also recommended several reference books to learn from the DBA. OCP oracle9i database-fundamenta

. (OCP)The Open Closed Principle When you wear your coat, you don't need a thoracotomy."Modules should be open to extensions, close to changes" 1. "Open to expansion", when demand changes, we can expand the module to have new behavior that satisfies those changes, making the software adaptable and flexible. 2. "Turn off changes", when we need to extend the new functionality, we should write new code, should not modify the original code.For the

people cloud in the open source technology to continue to invest in traditional enterprises to choose a few people cloud the most important reason. "A few people cloud is not to start selling open source software, but to continue to invest." Wei Xu, chief scientist of Digital Cloud, was assistant dean of the Institute for Interdisciplinary Information Sciences at Tsinghua University, where he received his doctorate in UC Berkeley and worked on Google for logs and performance monitoring.In Febru

Why is it so difficult to find a good Oracle DBA? This is not only the pain of many CIOs, but also the problem that many IT directors cannot solve. But where do so many people who have obtained OCP certification from ORACLE training courses go? Tom is a database administrator with An OCP license and a certain understanding of the database architecture and operating principles. I thought everything was okay

The factory method mode is an improvement on the simple factory mode. First look at the shortcomings of the simple factory model.Software is different from programs because it can be used by people and indirectly create benefits. Demand is the core of software development. Ignoring the needs of users, the software itself has no value. If Nokia has developed another new mobile phone n99, our approach for systems designed in a simple factory model is:1. added a cn99 class inherited from the cnokia

return value of createInstance () should be an animal (because the factory is used to produce animals, so the return value should also be an animal), and the parameter should be an animal name (so that the factory knows which animal you want to produce based on the name ). In this way, an animal instance can be generated based on the input animal name. CreateInstance implementation: switch (animal name) case BULL: return new ox (); case goat: return new goat (); case horse: return new horse ();

Use YEP Voucher through 1z0-050 exam, voucher1z0-050After some twists and turns, I finally found the "Oracle Database 11g Administrator Certified Professional" with the YEP test coupon, that is, the score of the 11g OCP upgrade test. It is true that there is a saying: "Paper OCP" and "the amount of gold is not high". The key is how you look at it. It is result-oriented and process-oriented. Of course, bot

the programmer should have the-solid principle of artistic temperament. S.O.L.I.D is the acronym for several important coding principles (programming Priciple) in object-oriented design and programming (Oodoop). SRP The single Responsibility Principle Single Responsibility Principle Ocp The Open Closed Principle Open Closure principle Lsp The Liskov Substitution Principle The prin

Editor's note: high-availability architectures share and disseminate a typical article in the architecture area , this is the record of the Pang of the cloud operations in Beijing on the "million concurrent" offline event of March 27.Not long ago, several people cloud joint Tsinghua University's Institute of Cross-Information, OCP Labs successfully hosted millions of concurrent HTTP requests through 10 OCP

Liskov substitution principle: subtypes (subtype) must be able to replace their base type (BaseType).Violation of LSP situationBreaches of LSP often result in the use of run-time type checking in a way that is clearly a violation of the OCP. Typically, an explicit if statement or If/else chain is used to determine the type of an object, so that the correct behavior for that type can be selected.structPoint {Doublex, y;} Public enumshapetype {square, c

, polymorphism refers to a phenomenon in which different class objects execute different code when they invoke the same signed member method. Polymorphism is the basis of the flexibility and extensibility of object-oriented programming .(iii) design pattern preliminary (1) S.O.L.I.D principleObject-oriented three elements are "encapsulation, inheritance, polymorphism", and any object-oriented programming language will support these three elements syntactically. It is very difficult to use the th

after a struggle, finally found the use of yep exam coupons to participate in the "Oracle Database 11g Administrator certified Professional", which is the 11g OCP upgrade exam results.Indeed now there is a saying: "Paper OCP", "Gold content is not high", the key to see how you look, is results-oriented, or process-oriented, of course, the two are the best. For me, I'm not a DBA, I'm not a full-time database

in a class to complete limited functions) 5: controller ["Inter-class relationship"] (the responsibility for receiving and processing system events should be assigned to a class that represents the entire system) 6: Polymorphism [scalability] 7: purely fictitious [encapsulation changes] 8: Indirect [isolate objects] 9: Change protection [encapsulation not changed] ------------------------- What is the principle of openness and closure? In the Object-Oriented field, there is a well-known Princip

coupling/dependency between the two modules. 9. Protected variations (protected changes) Locate unstable changes in advance and encapsulate them with a unified interface. If future changes occur, you can use the interface to expand new functions without modifying the original implementation. This mode can also be understood as the OCP principle, that is to say, a software entity should be responsible for extension development, and the modification s

signed member method. Polymorphism is the basis of the flexibility and extensibility of object-oriented programming.(iv) Preliminary design pattern(1) S.O.L.I.D principleSRP (Single Responsibility Principle, sole responsibility principle)OCP (open-closed Principle, open-closed principle)LSP (Liskov substitusion Principle,liskov substitution principle)ISP (Interface segregation Principle, interface separation principle)DIP (Dependency inversion Princi

now is to change the client, it seems to become more troublesome, So why use Factory mode?When should we use the factory model?Look at Then look at the client code:Well, now the need to come, these three students graduated, they program from college students community volunteers, we need to change the original code, three to create "Lei Feng's college students" into "community volunteers", we need to change three places. Then there will be repeated operations, if changed into a Factory mode to

, polymorphism refers to a phenomenon in which different class objects execute different code when they invoke the same signed member method. Polymorphism is the basis of the flexibility and extensibility of object-oriented programming .(iii) design pattern preliminary (1) S.O.L.I.D principleObject-oriented three elements are "encapsulation, inheritance, polymorphism", and any object-oriented programming language will support these three elements syntactically. It is very difficult to use the th

and code module design, here, I will first learn about the SOLID principle that programmers should have. S.O.L. I. D is the abbreviation of several important coding principles (Programming Priciple) in object-oriented design and Programming (OOD OOP. SRP The Single Responsibility Principle Single Responsibility Principle OCP The Open Closed Principle Open and closed Principle LSP The Liskov Substitution Prin

specific animal, which reduces the coupling between objects. However, if we want to add a new type of animal, we still need to modify the code in the factory class (new case statement Judgment), which also violates the OCP principle, and also causes the implementation logic in the factory class to be too complex, this is also the disadvantage of the simple factory model! 3. Factory method mode Background: In order to solve the problem that the simple

terminology."Real World"the object of concernWhat to Do ( How),implement functional specifications through the model. OOPbased on the design, use a programming language such asJava) encoding. ThroughOOA,OODand theOOPThe main line is abstract. OodGraphical Modeling Language for modelingUML(Unified Modeling Language), UMLis a generic modeling language that we use in our experimentsUmbrello is modeled,Windowsrecommended for everyone to useStarUML.The result of a process abstraction is a function,