what is difference between ods and data warehouse

What is the difference between ArrayList, list, and Vector ., Arraylistparts list The ArrayList, inclulist, and Vestor classes all implement the java. util. List interface, but they have different features, mainly as follows:I. SynchronizationArrayList and inclulist are not synchronized, while Vestor is synchronized. I

Today's data processing can be broadly divided into two broad categories: online transaction processing OLTP (on-line transaction processing), online analytical processing OLAP (On-line Analytical Processing). OLTP is the main application of the traditional relational database, mainly basic and daily transaction processing, such as bank transaction. OLAP is the m

About the difference between node. js and JavaScript, you know? Do you know about the similarities between node. js and JavaScript? If you do not know, then don't come to see this article, you are still waiting for what, see now First, let's look at the comparison between JS and node. JS: Javascript: ECMAScript (language basics such as syntax, data type structur

blocking, which means that the call does not block the current thread and returns immediately.Non-blocking is the question of whether the data is ready to be queried by polling, and if it is ready to get the data proactively. During this time the thread

.Summary of the differences between clustered and non-clustered indexesHere's a summary of the differences: A Clustered index determines the order in which the rows of the table would be stored on Disk–and it actually stores row Level data in the leaf nodes of the index itself. A non-clustered Index have no effect on which the order of the rows would be stored. Using a clustered index is an advantage

update.//初始时DOMain中没有元素x = document.querySelectorAll(‘img‘)y = document.getElementsByTagName(‘img‘)document.body.appendChild(new Image())x.length // 0y.length // 1In addition, getElementById this can only be used on document, because the ID is the only one under normal circumstances.It says a lot about the difference between the implementation and the principle of Queryselectorall and Getelementsby , and h

Often have friends to consult the most fire software station small series, about the difference between switches and routers, in fact, if you have used the switch and router friends should be aware of, for everyone, switches and routers in the use of the biggest difference is that the router can achieve dial-up Internet, and then through sharing to many computers

Label: des style http OS ar SP data I am not a top-level designer (I don't even know what to call top-level designers). Even some top-level (well-known or excellent) designers I have met cannot be evaluated because of lack of in-depth communication. But I barely answer the question of a good designer and an ordinary designer (in fact, I think most common designers only know him/her a little less, OK ?)

What is the difference between heap and stack ?? It can be simply understood:Heap: the location of the space allocated by functions such as malloc. The address increases from low to high.STACK: it is the space used for automatic Variable Allocation and function calling. The address

heap. The specifics of the heap are arranged by the programmer. 2.6 Comparison of access efficiency Char s1[] = "AAAAAAAAAAAAAAA"; Char *s2 = "BBBBBBBBBBBBBBBBB"; The AAAAAAAAAAA is assigned at run time; And the BBBBBBBBBBB is determined at compile time; However, in future accesses, the array on the stack is faster than the string that the pointer points to (f

to ENUM. 2. use join instead of subquery 3. use UNION instead of creating a temporary table manually 4. transaction processing (ensure data integrity. for example, if both are added and modified, both operations are performed, and both operations fail) 5. how to create an index? Advantages and disadvantages of indexes ?) 6. optimize SQL statements 7. the explain command shows the mysql execution plan. 8. table sharding (vertical table s

Java programmers are involved in php at the beginning. what is the difference between java and j2ee? is there a dopost and doget method similar to servlet? If you want to develop an http server, the client directly returns data after accessing the server through http. If you

What is the difference between the role of M and C in the MVC pattern? For example, the establishment of a student information management system, M can change the student information and search, Operation database. What do you need to do with layer C? Of course, the C-tier can also use SQL to manipulate the database

What is the difference between GET and POST ? Use the POST method to send a login request . {1> http method : The HTTP protocol defines a number of methods that correspond to different resource operations , the most common of which are the GET and POST methods . {{GET,POST,OPTIONS,HEAD,PUT,DELETE,TRACE,CONNECT ,PATCH} increased :P ut

What is the difference between static pages and Memcached? Sorry, I don't know much about php. I do java, because Memcached also exists in java. I still have some knowledge about Memcached in java. Our company is working on a mobile phone application, and PHP is used on the

Tags: class business body Difference Telecom diameter bring APN dynamic"Technical stuff." What is the difference between the user database HSS in LTE networks and the HLR of traditional 2g/3g? Can I combine networking?EPS HSS and HLR are respectively responsible for 4G user data