oca ocp

When creating a unique constraint, the OCP will forcibly create or reuse the index www.2cto.com (if no index exists in the previous column, the created index is a unique index. In this case, the index name and the constraint name are the same, and the index cannot be deleted. When unique constraint is deleted, unique index is cascaded. ② If an index already exists in the column, the previous index will be reused without changing the index type. When w

OCP question analysis _ 043: buffer cache and hit rate calculation method: www.2cto.com SELECT name, (1-(physical_reads/(db_block_gets + consistent_gets) * 100 H_RATIO FROM v $ ratio; the hit rate, as the standard for measuring the performance of the database, is already an old man's experience. Today, the hit rate can be used as a reference through the oracle wait interface, but the hit rate is not necessarily related to the system performance level,

Analysis of OCP question _ 007: synonym synonyms are the alias of the base table. They are defined only in the data dictionary. They do not store synonyms. They provide location transparency for distributed databases. Accessing resources in different regions is just like accessing local resources. www.2cto.com (I) Syntax:Private synonyms without public are the synonyms created by common users. They are private, this is because only the user who create

OCP question parsing _ 043: flashback transaction query can obtain the historical information of the specified transaction from FLASHBACK_TRANSACTION_QUERY and Undo_ SQL through this UNDO_ SQL, query the operations performed by a specific firm, and then we can restore specific transactions. flashback transaction query test www.2cto.com OCP question: [SQL] 13. you executed the following query: SELECT operati

The database has opened OCP notes. Thank you very much for the blog. Thank you. I _like_cpp http://blog.csdn.net/ I _like_cpp Among them, OCP has a question like this: Q606. you realize that the control file is damaged in your production database. After restoring the control file from autobackup, what is the next step that you must do to proceed with the database recovery? A. Mount the database B. Open the

The five principles of OO refer to SRP, OCP, LSP, DIP, ISP.Open Closed Principle is the most basic design principle in the Java world, which guides how we build a stable and flexible system.Defined:A software entity such as classes, modules, and functions should be open to extensions and closed for modification.Softeware entities like classes,modules and functions should is open for extension but closed for modifications.The opening and closing princi

After completing the last exam at noon, I always thought that I would be excited after I passed the exam. Who knows that my performance was calm and I was surprised, as if I thought it was something else. For a long time, there have been two OCP goals: one is to make a summary of Oracle over the past six years; the other is to verify that after so many years of work, I still have not lost my self-learning ability, this meaning should be far greater th

I finally completed all the OCP DBA courses. Tired! In general, Oracle certification is worth the test. I have a ccnp and MCSE certificate, but after passing the DBA examination, I feel that I have not only deepened my understanding of modern databases, but also enriched the knowledge structure of computer science. In my opinion, Oracle databases even have some operating system functions. There are quite a few things to remember about Oracle exams.

Design principles (1) "Open-Close" principles (OCP) The cornerstone of classical mechanics is Newton's three major laws. The first cornerstone of object-oriented reusable design is the so-called Open-Closed Principle (OCP ).I. What is the principle of opening/closing? The principle of "open-close" is that a software entity should be open to expansion and closed to modification. This principle was first prop

Opening and closing principle OCP (Open for extension,closed for modification). The core idea of open and close principle is that an object is opened to expansion and closed to modification. In fact, the opening and closing principle means that changes to the class are made by adding code rather than altering the existing code. In other words, once the software developer writes out the code that can be run, it should not change it, but to ensure th

Tags: SQL query statement SQL statement SQL Tutorial SQL language SQL database tutorialOracle SQL Language Foundation and Environment readiness-beyond OCP proficient Oracle Video Tutorial Training 26This course introduces:Oracle Video tutorial, wind Brother this set of Oracle Tutorial training is the Oracle SQL Language Foundation and Environment preparation, the course content is as follows:Introduction to Oracle Database SQL language BasicsOracle Da

Tags: SQL query statement SQL Tutorial SQL language SQL database tutorialOracle SQL Language Query statement-beyond OCP proficient in Oracle video tutorial training 29This course introduces:Oracle Video tutorial, wind Brother this set of Oracle Tutorial training is the Video Learning Address:Http://edu.51cto.com/course/course_id-8047.htmlOracle SQL language Query statement, the course content is as follows:Oracle SQL query Restriction orderingSelect B

Oracle Performance Optimization Execution plan management-beyond OCP proficient Oracle Video Tutorial Training 31This course introduces:Oracle Video tutorial, wind Brother this set of Oracle Tutorial training Video Tutorials:Http://edu.51cto.com/course/course_id-8319.htmlOracle Performance Optimization Execution plan management, the course content is as follows:Introduction to 1.Oracle performance optimization2.SQL Statement Processing Flow3. Soft par

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Oracle Performance Tuning-Beyond OCP proficient Oracle Video tutorial Training 38Course IntroductionWind Brother Oracle Video tutorial , operating system optimization tuning, storage System optimization tuning experience, database instance level tuning, SQL Statement Index optimization and adjustment, SQL statement optimization rewrite case, SQL Automatic optimization method and case, common performance view introduction, 4 common performance failure

Oracle OCP Notes (31) using the Flashback featureOracle's flashback feature is supported by one of 3 database architectures: Undo data, Flashback recovery area, and Recycle Bin.Undoing data in the undo Tablespace not only supports transaction rollback, but also most of the flashback table operations. Flashback Data Archives allows querying a previous version of a table row, which provides a zone in one or more table spaces outside of the undo tablespa

Tags: page jump mysql 5.6 base technology share upload TPS ATI Scholarship OptionsMySQL OCP OverviewThe Oracle OCP (Oracle Certified Professional) exam may be familiar to you all. However, since MySQL was acquired by Oracle, Oracle has launched the MySQL OCP exam. Unfortunately, MySQL does not have a OCM (Oracle certified Master) exam, and OCM certification can b

Tags: oracle 11g OCP test Bank Analysis certification Exam TU Institute Oracle Oracle OCP Certification ExamQUESTION 7See the Exhibit:650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/58/D3/wKioL1S-ANjxQfvvAAGCoebVEEQ971.jpg "title=" Picture 1.png "alt=" wkiol1s-anjxqfvvaagcoebveeq971.jpg "/> Which statements is true regarding the USERS tablespace? (Choose all, apply.)A. a bitmap is used to the re

Preface in this chapter, we will explain part 1 of the Five Principles of S.O.L. I. D: Implementation of JavaScript language, and the principle of open/closed OCP (TheOpen/ClosedPrinciple ). The open/closed principle is described as follows: Softwareentities (classes, modules, functions, etc.) shound... PrefaceIn this chapter, we will explain part 1 of The Five Principles of S.O.L. I. D: Implementation of The JavaScript language, and The Principle of