effective oracle by design

in Iofile.However, virtual inheritance is not commonly used because: 1. Virtual inheritance increases the cost of space and time. 2. Virtual inheritance can be very complex (writing costs) because the virtual base class, either indirectly or directly inherited, must assume the initialization of these bases, regardless of how many layers of inheritance are. Please rememberMultiple inheritance is more complex than single inheritance. It can lead to new ambiguity and the need for

Two days ago, at the invitation of a boss, for product planning to do a lecture. Because the preparation is not very sufficient, speak also a little short, so may be in many students listen to, there will be some boring and irrelevant. So simply retell the handout, for all interested students to criticize the advice. Objective A design to give lectures to the planners, how much is also a cross career, so finally selected a relatively simple and

The task seems a little unstoppable for the first website that is about to embark on or the current site. There are several factors to ensure that your website is an effective tool for your business and a worthwhile investment. Clear analysis and easy to browse. Cleaning is a word, and you will hear a lot of designers use it. This means that the design is not overly complicated. Each element has its own bre

Oracle performance topics are very broad and there are many books on the market that specifically describe Oracle tuning. The pursuit of performance is endless, need long-term unremitting efforts, but to avoid the problem of performance is not difficult, can be said to be simple. From a simple and practical point of view, this paper gives several effective ways t

Have such a kind of article title, like to learn people must have seen: 7 Tips for using Google 9 Common usability errors in web design Adobe Photoshop 75 Tips 10 tips to make you a master in font design 12 Laws of Web design implementing clean Code 18 Tips for CSS in web design Common in eng

You may have noticed that the page elements of some websites move at different speeds when the scroll bar is dragged to form a three-dimensional scenario. This technology, known as Parallax Scrolling, is becoming increasingly popular. More and more websites use this technology to attract users and make them more interesting when dragging the scroll bar. The websites we share below are all excellent cases that use the parallax scrolling effect. Nike Air Jordan 2012 Soleil Noir Activate Drinks

Specify interface inheritance and enforce inheritanceArticle 35: Consider alternatives other than the virtual function。。。。。。。。Article 36: Never redefine inherited non-virtual functionsWhen a non-virtual function in a base class is redefined in a derived class, accessing the Non-virtual function with a pointer to a base class type, which actually points to a derived class object, accesses the Non-virtual function of the base class object. The reason for this behavior is that non-virtual is stati

objects.Article 40: Use multiple inheritance wisely and prudentlyPlease remember:1. Multiple inheritance is more complex than single inheritance. It can lead to new ambiguity and the need for virtual inheritance.2.virtual inheritance increases the cost of size, speed, initialization (and assignment) complexity, and so on. If virtual base class does not carry any data, it will be the most useful case.3. Multiple inheritance does have a legitimate purpose. One of the episodes involves the two-pha

converted to T2,T1 write type conversion function operator T2, or T2 write Non-explicit constructor Whether the conversion requires a explicit function What operators and functions are reasonable Who takes the member with the new type Public,protected,private,friend How generalized is your new type? Do you need to have a class template 20. Use Pass-by-reference-to-const instead of Pass-by-value to pass-by-value problems P

the compound Use composite as much as possible Use private inheritance when you need to change a virtual function in the private inheritance base class Another way to override a private inheritance is to change the virtual function by using a compound that defines a nested class that inherits from the public, and the composite class uses that nested object. class Widget {private: class WidgetTimer:public Timer { public： virtualvoidOnTickconst;

tem1) {return CTest (tem0. GetValue () * tem1. GetValue ());} CTest Test0 (1); CTest Test1 = Test0 * 2;//allowed by compiling//ctest Test2 = 2 * test0;//not allowed by compile//reason ctest Test1 = Test0 * 2; can be compiled because an implicit type conversion occurs, converting 2 to CT EST type//the reason ctest Test2 = 2 * TEST0; cannot be compiled because only the arguments are in the parameter list, this parameter can only occur implicitly type conversions. CTest Test2 = Funtest (2, 2);//al

The first time to study one months, read the "Big Talk design mode" and "Effective C + +" two books, the first half of the two books are relatively easy, but later parts, such as: C + + memory, exception and template knowledge is difficult to understand. It may be that you rarely use exception handling and template relationships with yourself. I insisted on one months, anyway, these two books brought me a l

Tags: php password mysqlLate-night code tried countless ways to finally see the resultslogin.php content is as followslogin_1.php content is as followsconnect.php content is as followsThe database is designed as followsPHP Login Verification and code implementation with database design Pro-Test effective

to select the crosstab (intersection table) as the underlying table, which is the table referenced by the other table.Like what: The EMP table description describes the intersection of the location table and the category table. SELECT * FROM location L, CATEGORY C, EMP E WHERE e.emp_no between, and e.cat_no = C.cat _no and e.locn = L.LOCNwill be more efficient than the following SQL: SELECT * from EMP E, location L, CATEGORY C WHERE e.cat_no = c.cat_no and e.locn = L.

Tags: managing tuning direction Cache ACK Analysis binding shared pool SQLAnalysis of effective cursor management"Thinking Analysis"The ability to interpret cursors as shared run schedules when SQL is not shared. There are two directions to the conventional approach:1. Adjust the size of the shared pool (shared operation plan in the library buffer of the shared pool);2, SQL writing as far as possible to reuse the binding variables, in order to play th

Tags: Oracle Grant revokeThe Oracle empowered Reclaim permission is to use the GRANT and REVOKE statements, but will it take effect immediately upon completion of the empowerment and RECLAIM permission statement? In addition, Oracle's permissions are divided into system permissions, role permissions and object permissions, which three kinds of permissions grant and revoke

Label:Keyword: Oracle to MySQL, Oracle to MySQLOkay, try it. Navicat family's new product Navicat Premium, he integrates Oracle, MySQL and PostgreSQL management as one, personal feeling very strong (feel Fast)!On the whim, can oracle import MySQL? Try it first:1) New Oracle

Data sharing is one of the most basic features of a database. However, data sharing brings convenience to employees, but it also has some negative effects. For example, the damage to Data Consistency caused by concurrent user access, the damage to data integrity caused by accidents during data modification, and unauthorized data modification by illegal users. Therefore, in the database design process, the database administrator must consider how to im

Increase the size of the TMPFS under Oracle Linux and increase the 502M to 3G (note: The initial value is half of memory)First change the/etc/fstab tmpfs size to 3GAdd size=3g after Tmpfs,Ok,/etc/fstab edit completed, but Oel and redhat a little different, just change fstab not, after the OS restart TMPFS will become the general memory, so we also need to change another configuration file/etc/rc.d/rc.sysinitFirst, comment out the following statement#m

Tags: Database design Oracle Database systemThe following is a formal introduction to the actual large-scale projects Oracle the advanced design and development of the content, the following explanation Oracle both the content and the sample programs are based on ORACLE11R2