ocp protocol

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 Open and Closed OCP (The Open/Closed Principle ).The opening/closing principle is described as follows:Software entities (classes, modules, functions, etc.) shocould be open for extension but closed for modification.Software entities (classes, modules, methods, etc.) should be open to extensions and clos

133.You created a profile app_user and assigned it to the users. After a month, you decide to drop theProfile. Some user sessions is currently connected to the database instance and is using theApp_user profile.This command was used to drop the profile:sql> DROP profile App_user;Which statement describes the result?A. The command produces an error.B. The profile was dropped and current user sessions use the DEFAULT profile immediately.C. The profile was dropped and only the subsequent user sessi

disconnected, service process shutdown3. Background process: DBWR, LGWR, Pmon, Smon, CKPTTo view the background process statements that are being executed in the current system:Select name from v$bgprocess where paddr =============================================================================================================== ======================== memory Structure (SGA)--video 21: The installation section of the database is skipped ... Memory structure (SGA)--video 22: The installation par

-oriented development How to use the open/closed principle: Abstract constraints First, through the interface or abstract class constraints extension, the extension is bounded, not allowed to appear in the interface or abstract class does not exist in the public method;Second, parameter types, reference objects use interfaces or abstract classes as much as possible, rather than implementing classes;Thirdly, the abstraction layer is kept as stable as possible, and modifications

) and the recovery catalog. You want to copyThe production database to another host, SHOST2, tests the new application.When you ensure that the backup of the target database is accessible on the new host, you mustDo you want to restore and restore a backup of your test environment?A recover control file from backup with NOCATALOG option and recover data fileA correct, b error is that the topic requires what must, and if the directory structure is the same, it does not need set newnameFor each da

-00312: Online log 1 thread 1: ' E:\ORACLE\ORADATA\ORCL\REDO01. LOG 'View ' E:\ORACLE\ORADATA...\ file, no REDO01.LOG file, only REDO03.LOG, obviously, this is the root cause of ORACLE boot failure, and ORA-01033 error is only a superficial phenomenon. Find the root of the problem is good to do, Google, there is a solution, can not help but once again feel that there is no solution to the dog world problem. Here's how to fix it:C:\sqlplus/nologSql>connect Sys/as SYSDBASql>alter Database Clear Lo

The most basic principles of object-orientedSoftware entites like classes,modules and functions should is open for extension but cloased for modificationsA software entity such as classes, modules, and functions should be open to extensions and closed for modification.At the beginning of the design of the actual development process, we should list out all the possible behaviors of the system and add these behaviors to the abstract bottom, which is simply impossible, and it is not economical to d

Customers Where cust _maritial_status= ' married ' group by cust_city; C: Statistics ' Tokyo ' and ' Sydney ' Two cities average male customer credit limit Selectavg (cust_credit_limit) from Customers Where cust_gender= ' male ' andcust_city in (" tokyo ', ' sydney '); D: List the customers with the same credit limit in Tokyo city.Select * from Customers cust1,customers Cust2where Cust1.cust_credit_limit and Cust2. cust_city= ' Tokyo '; E: Count the number of custo

, we create an object for each problem type for the respective code implementation, but each implementation must contain the Renderinput method to overwrite the Renderinput code in the Questioncreator method, which is what we often call the policy pattern. By refactoring, we can remove the enumeration answertype of the unnecessary problem type, and let choices be the required parameter for the Choicequestioncreator function (the previous version is an optional parameter).SummarizeRefactorin

2. View the Exhibit to examine the description for the SALES table.Which views can has all DML operations performed on it?(Choose all, apply.)A.CREATE VIEW v3as SELECT * from SALES WHERE cust_id = 2034 with CHECK OPTION;B.CREATE VIEW v1as SELECT * from SALES WHERE time_id C.CREATE VIEW v2as SELECT prod_id, cust_id, time_id from SALES WHERE time_id D.CREATE VIEW v4as SELECT prod_id, cust_id, SUM (quantity_sold) from SALES WHERE time_id Answer:abTopic Analysis:The question is, which view

successfully but does not give the required result.Answer:APersonal Understanding:The first condition of the topic, requires the return of the letter A,b,c the beginning of the customer name, query two did not return to meet the requirements of the results, explanation of reason there is a variety of understanding. According to personal understanding, the second query returns the beginning of A and B (including case!). The user name of all and single letter C (including Case c).In fact, I think

IsTo flash back to the database, Oracle needs to record the before image of the data block to a new log This type of log is named flashback database logs flash back log, flash back log is always repeatedly used, continuous writing When a data block is modified for the first time in an instance, the foreground process copies the before image of the data block to the flashback log buffer in the shared pool. The rvwr Process regularly refreshes records in the flashback log buffer to the disk. Befor

! If the buffer cache is too smalll for your system, You will see "free buffer waits" in the V $ system_event table. And that is the better place to check. If the hit rate is indeed very low, you may try to check Top N (SQL or event) The following uses top SQL as an example. There are many ways to find top SQL, the most common method is to find top SQL in the statspack report. In addition, OEM top SQL tool oem SQL aanlyzer 10gaddm can also sort top SQL based on the influence of SQL on the sys

Scjp, scwcd, Oca, OCP Http://java.sun.com/javaee/downloads (Java ee 5 SDK Preview (des Sun Java System Application Server PE 9 beta)) The advantages of the Java ee 5 platform: A conversation with distinguished engineer Bill Shannon By Janice J. Heiss, March 2006 Articles Index Version 5 of the Java platform, Enterprise Edition (Java EE, formerly referred to as J2EE), has arrived. i

Analysis of OCP questions 053-16 MEMORY_TARGET, ocp053-16 16. Setting which of the following initialization parameters enables Automatic Memory Management?A. MEMORYJARGET B. MEMORY_MAX_TARGET C. SGATARGET D. PGA AGGREGATE TARGET Answer: [Resolution] The MEMORY_MAX_TARGET parameter is added to the 11g file. This parameter is as refreshing as the first SGA_MAX_SIZE parameter appears in 10g. Memory_max_target is used to set the maximum memory space occ

wocould get created and all the foreign key constraints defined on the specified columns wocould be passed to the new table. CreateTableT2(Col1Number (2)PrimaryKey,Col2Varchar2 (10));CreateTableT3AsSelect*FromT2; The not null constraint implicitly declared (for example, the not null constraint of the primary key) will not inherit. (Can this be explained in the above example ?) Creating a table using a subquery Create a table and insert rows by combining the create TABLE statement

17. You configure autobackup to on an RMAN session. When will RMAN back up the control file?(Choose all that apply .) A. When you run an RMAN backup command B. When you run an RMAN allocate command C. When you add or drop a table in the system tablespace D. When you change the physical structure of the database, such as dropping a tablespace E. When you specify the including controlfile clause Original answer: A is obviously incorrect! Correct answer: de [Resolution] The atuobackup on here re

Preface In 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 open and closed OCP (the open/closed principle ). The opening/closing principle is described as follows: Software entities (classes, modules, functions, etc.) shocould be open for extension but closed for modification.Software entities (classes, modules, methods, etc.) should be open to extensions

In my personal understanding, the inline view usually refers to the result of an SQL query as a data source for another query, usually after the from clauseAny indicates that any one of the datasets is equal to or.X> Any (select Sal from EMP where job = 'ana ')It is equivalent:Exists (select Sal from EMP where job = 'ana 'and x> Sal)Subqueries using all and any can always be replaced by embedded views, and the performance of this view is much better, because it uses the index of the connected ta

Tags: sha wildcard character cat nbsp path usermod list Basic Create a folderBasic command:Create/Modify/delete user Useradd/usermod/userdelCreate/Modify/delete user groups Groupadd/groupmod/groupdelModify the owning user/owning user group Chown/chgrpModify Permissions chmodCreate a folder mkdirCreate a file TouchSwitch Directory CDDelete files/directories RMDisplay list Ls/llEdit Vim/geditOpen File More/less/cat/tailView Help ManShow current working directory PWDMoving MVCopy CP/SCPPermissions: