nosql use cases

In terms of creating, communicating, accessing content, sharing information, and buying products, the rapid expansion of a new generation of internet-based services, such as e-mail, blogs, social media, search, and E-commerce, has actually redefined the behavior and trends of WEB users. As the number of these systems continues to grow, IT professionals are witnessing the scaling up of data and data consumed, and growing scalability requirements and new functional requirements pose new challenges

There are three relationships in the case relationship: "include", "extended", and generalization. Of course, there is also the most basic relationship, "association ". Including the link: The inclusion relationship is used to separate some workflows. For these workflows, the basic use cases only depend on the results and are irrelevant to the methods used to obtain the results. If such separation can simpl

Basic use cases of redis in PHP and redisPHP. The basic use cases of redis in PHP, and the use cases of redisPHP download www. oschina. after netpredis is decompressed, it contains the lib source file, examples example, and test t

Write to test newcomer Summing up the test rookie, how to quickly find the system's deficiencies or defects 1, read the requirements of the document, in-depth understanding of the system, Maito, do not have to understand the need to open the test, (one weeks ago, the company just entered a new person, TD on the view of their hair bug, Several were found to be ambiguous in demand) thinking: The original is this system Ah, project training when done and this similar project, so the system needs of

NoSQL: Non-relational, distributed, acid-not-availableSimple Data ModelSeparation of metadata and application dataWeak consistencyAdvantage:Avoid unnecessary complexityHigh throughputHigh level of scalability and low-end hardware clusteringDo not use object-relational mappingsDisadvantage:ACID Properties Not supportedSimple functionNo unified data Query modelAcid:atomicity Atomicity, consistency consistency

Brief introductionMean is a full stack development framework for JavaScript. More aboutThe storage of persistent data with MongoDB is a part of mean web full stack development.MongoDB is a product between a relational database and a non-relational database, and is the most versatile and most like relational database in a non-relational database. It is characterized by high performance, easy to deploy, easy to use, and easy to store data.MongoDB's lear

Introduced This document will be a "high-level" principle of how to use Robotframework to write good test cases. The details of how to use robotframework to interact with your test system are not included in this document. The most important rule is to ensure that the test case is People who are familiar with this field are as simple as possible.

When talking about use cases, many people may be familiar with them, but many will not actually use them. Next, based on the accumulation and reading of books over a period of time, we will summarize the following, which will inevitably lead to errors. We also hope to criticize and correct the mistakes and make progress together.

A Business Use Case defines a group of business use case instances. The business use case has a name. A Business Use Case instance is a series of actions performed in the business. These actions generate visible and valuable results for the individual protagonists of the business.A business process is defined as sever

[MySQL Notes] Use Cases of MySQL indexes and the SQL types that actually use Indexes 1. Why are indexes used?Without an index, MySQL scans the entire table to find records that meet the SQL conditions. The time overhead is positively related to the data volume in the table. Creating an index for some fields in a relational data table can greatly improve the query

for the process. Returning a book is basically the same process. Do you remember what you said on the last article? The first step is to identify users from the stakeholders. and define the relationships between these users. Users here refer to those stakeholders who will have a relationship with the system to be built. indicated by the following figure. This picture shows all the users and the relationships between them. It should be explained that the users here refer to the business user, n

story:In a training break gap, Zhang Bing to Miss Liu's ideas about volleyball scoring methods, Zhang Bing that the current training used in the use of the flop scoring style is more traditional, should use a new more concise scoring method, such as the use of program scoring, so that scores in the form of digital display to the display, So that the game process

I. A. py file executes the test case in bulk (a. py file under multiple use cases)If used directly: Unittest.main (), it is executed in alphabetical order,The use of Suite.addtest (the class name ("Method name"), which is the order of additions, modifications, and deletions, avoids the processing of the test data after the completion of the

Http://www.cnblogs.com/gisdev/archive/2007/11/15/959843.html The use case diagram is used to analyze a system. The relationship between use cases must be considered during this period. Find the following information.Body:The use case diagram is mainly used to illustrate the main event process of the system. It is main

hbase (Main):055:0>get ' tb1 ', ' Zhangsan ', ' info ' COLUMN CELL info:age timestamp=1435129054098,value=man info:sex timestamp=1435128714392,value=22 5.9 Update a record (overwrite)HBase (main):063:0> put ' tb1 ', ' Zhangsan ', ' info:sex ', ' 0 ' row (s) in 0.0080 seconds6.0 Add a Comment field to LisiHBase (Main):070:0> incr ' tb1 ', ' Lisi ', ' info:comment '6.1 Delete a row of a column family dataHBase (main):065:0> delete ' tb1 ', ' Zhangsan ', ' info:sex '6.2 Delete all records in

I don't need to talk about the concept of the use case diagram. Anyone who can see this article knows the concept of the use case diagram. What is the most important diagram in UML? There is no doubt that it should be a use case diagram. Use Cases are an important basis for

Business and System Use Cases Business Use cases have the same characteristics as system use cases. Therefore, the method of writing and reviewing use

I. A. py file executes the test case in bulk (a. py file under multiple use cases)If used directly: Unittest.main (), it is executed in alphabetical order,The use of Suite.addtest (the class name ("Method name"), which is the order of additions, modifications, and deletions, avoids the processing of the test data after the completion of the

Tags: redis, memlink, key-value, key-list, nosql "Currently, Internet data is stored in two ways: relational databases or key values. However, these Internet businesses do not belong to these two data types. For example, the relationship between users in the social platform is a list, if you want to store data in a relational database, you need to convert it into a multi-row record format, which has a lot of redundant data, and each row needs to s

At present, in the internal version of "The Condor Heroes", Yang Guo and the little dragon girl have an unknown tacit understanding and romance, that is, the side-by-side villain they have drawn. Such a villain is part of the UML use case diagram and is called a participant. 2.1 use cases and Use