quanta ocp

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:

Today I took the exam of 1z0-001 and 1z0-026, pass. So far, ocp8i's exams It's over. 1Z0-001 is very simple on the internet, but it takes a long time in the exam, which may be The topic description is too long, at the same time many options are very confusing, a little attention will choose Error. Maybe I've never written it in the wrong way, but I can tell. Not come out. The Pl/sql in 001 is really very simple, are all concepts, so there is no need for pl/sql To test 007, but it is estimated th

, indexes, partitions, and more.SQL Tuning Advisor: can provide materialized views, indexes, partitions and other suggestions; run automatically in the Maintenance window.Small difference: SQL Tuning advisor adjusts each SQL statement individually; SQL Access Advisor adjusts all SQL statements at the same time.27.Database Configuration Assistant: In the Nomount State, only the service is deleted and the data is not deleted.28.Automatic Workload reporsitory (AWR): Automated Workload repositoryThe

that all submitted data is written to the data file during a consistent shutdownInstance recovery time:Refers to the time required to push the last checkpoint (checkpoint location) of the data file to the latest SCN recorded in the control file. Administrators can control the time by setting the mttr target and resizing the redo log group.MTTR:Mean time to Repair, that is, the mean duration of repair. Refers to the average repair time for repairable products, which is the time between failure a

free space in the data block, the new state of the block is reflected in the bitmap. By using bitmaps, the Oracle DB You can increase the degree of automation in managing free space. Therefore, this type of space management is called "Automatic segment Space Management (ASSM)".Manual: This method specifies that you want to use an idle list to manage free space in a segment. A free list is a list of blocks of data that have space to insert rows. Because of this way of managing the space, you nee

: CannotInsert NULL into("SCOTT".) SALES "." channel_id ")And the V3 view canSql> Insert intoV3Values(1,2034, Sysdate,1,1,1);1row created. SQL> Commit;CommitComplete . SQL> Select * fromv3; prod_id cust_id time_id channel_id promo_id quantity_sold---------- ---------- ------------------ ---------- ---------- ------------- 1 2034 Geneva-JAN- - 1 1 15. Which SQL statements would display the value 1890.55 as $1,890.55? (Choose three.)A.SELECTTo_char (1890.55,'

Patch/one-off Patch Patch installation cases and failed rollback cases, daily management and maintenance of the PSU patch set installation case for Oracle 11.2.0.4 and the failure of rollback cases. Details of the course are as follows:01. Be familiar with Oracle software version number02. Mastering Oracle Patch Classifications03. Current PSU Release status04.opatch Patch tool and installation case05.interim patch/one-off Patch Minor patch installation case06.interim Patch/one-off Patch install