Database field 6 Experts talk about DB2 9

The six experts in the database field are "Professor Zhou Longxian, professor of mathematics and systems at the Chinese Academy of Sciences, Chen Hong, China financial electronics architect Zhu Jie, and Ms. Zheng, Mr. Wangyun, and Ms. Wangmin", with the 3 experts now working for IBM China Branch.

The following is the content of the discussion round Table of experts, for netizens ' reference:

Professor Zhou: XML this is the abbreviation of a few phrases, we know that language is the tool of communication, people and people are natural language communication, people and computers, computers and computers to communicate and understand through a language, we used to know several languages, is the calculation of things to the computer to calculate, Computers will be able to understand the language. Our present XML language is a new kind of language, why it is now becoming a concern and need for it, an important reason is that now we have entered the era of the Internet, this era of people and people, business and enterprise communication between the very frequent, in this exchange, You need to have a language carrier to describe it. The XML language exactly meets the requirements but this language, developed very fast in recent years, the predecessor is Stxml language, more complex than this language, if a language is too complex and not, we can not accept, now a simplified version is XML, just in line with the current era of the trend and demand.

It is particularly suited to describe some of our common phenomena, we know our common phenomenon, the most intuitive is the structure of trees, such as our country, the People's Republic of China under the provinces under the provincial capital, is such a structure, this structure if the relationship to describe the words, it is not easy to express a layer of the structure, However, the use of XML language is very convenient, that is, under China separate 29 provinces, and then the provincial capital and counties and cities, it is very convenient, if the use of such language in the communication between the computer and transmission is very easy, which is in line with the new trend, the language of the internet age.

Wangyun: To talk about pure pure there are many ways to explain, if use the romantic method explanation, Chinese word is very interesting, have a lot of pure, today our press conference is DB2 9, this DB2 9 is what meaning, we 9 can be number 9, also can say DB2 version is a bottle of good wine, want to undergo a long time to incubate to come out, What really makes wine smell is the wine is very mellow aroma, is alcohol very alcohol. What is XML, that is, in the DB2 to play a mellow flavor is the XML, this is pure XML. This is more funny, what is purexml, we not only at IBM, we have an early one to provide an XML function at the level of the database, we call XML EXTENDER, we say in relational database. We were five or six years ago, we were in the IBM DB2 inside, is Zheng led to do, the first version of the support made, such a technology, in addition to IBM is doing, we in the database in other industries also use the same technology to do this thing. How good it is to do this thing, that is, the hierarchical database, just like the tree-like structure of Professor Zhou, a layer, above a layer called father or mother, there are many children below, like the People's Republic of China under a lot of provinces, cities and towns, is the relationship between father and mother, is a tree-like structure, the tree is to climb, To climb up and down. Such a tree structure, how we save, to answer you in a second way, what is the database, how to save a database.

We say the set is a combination, is separate, we use a complex data structure, not only to crawl, we also need to know how to save up, now to use relational database for Ascension, to do a set, is to use a large object, the big box to put things together. is divided into a lot of small, scattered to save. In the processing of XML when the set is not good, not good, set together, each time to deal with, see a lot of things, if the split is very loose, to pick up. IBM is based on a hierarchical database developed 40 years ago, we use a very cost-effective way to deal with the huge tree-like structure, not only can break apart to do, this way we do the IMS in the tree structure of the experience to do a higher optimization, and then explain pure from another angle, Need to climb up and down, how to deal with a more cost-effective way, not in the traditional way of relational string together, that is, women's skirts, there are long short, long short all need, can not be confused. This is to combine a complex structure, that is to say what is pure database, that is, IBM processing tree-like structure, with 40 years of experience to do an optimization, after years of brewing out of good wine, a mellow wine. This is IBM's solution to the problem of storage and application of XML from a basic point of view.