nosql database schema design

Label:Original website: http://www.cnblogs.com/Ferry/archive/2011/01/12/1934126.html Just recently used in this aspect of things, see this blog, feel very good, so reproduced over collection. The following is the body content: Here is a preliminary design with PowerDesigner, which may be modified later. 1. Start PowerDesigner New physical data model 2. Tool bar 3. New Table Model 4, add the first table, you can double-click the table or the right

Tags: design Five analysis set up the data physics sum synthesis demandThe design of the database is divided into five phases:Demand Analysis: The main is to accurately collect the user information needs and processing requirements, and collect the results of the collation and analysis, to form a demand description.Conceptual structure

Database schema database in bare-Ben era1. The database server has a single point of issue2.DB server resources cannot meet growing read-write requests3. The number of database connections often exceeds the upper limit at peak timesHow to solve a single point problem1. Add a

Self-study PHP for more than half a year, intermittent, but eventually still determined my idea, will PHP continue, so write this PHP blog is to find a stable php work, do not ask for a high salary, but seek a place to take shelter. I can read most of the English documents, people are not stupid, love to learn, interested can contact! Come in good faith! qq:240382473 I will publish all the key codes and documentation in 3-5 times, all the styles of the blog background are applied to the blog par

Self-study PHP for more than half a year, intermittent, but eventually still determined my idea, will PHP continue, so write this PHP blog is to find a stable php work, do not ask for a high salary, but seek a place to take shelter. I can read most of the English documents, people are not stupid, love to learn, interested can contact! Come in good faith! qq:240382473 I will publish all the key codes and documentation in 3-5 times, all the styles of the blog background are applied to the blog par

self-study php more than half a year, intermittent, but finally determined my idea, will continue to PHP, so write this PHP blog is to find a stable php work, do not ask for a high salary, but to find a shelter. I can read most English documents, people are not stupid, love to learn, have the interest to contact! Come in good faith! qq:240382473 I will distribute all the key code and document descriptions 3-5 times, all the styles in the blog background are applied to the blog park! Description

Overview This paper introduces the database design based on The three-paradigm of computer room charge system . Meets only the most basic functional requirements. Do not include additional information to save.RecallThe relationship pattern design has a Direct impact on data redundancy and data consistency. Thus, we have an evaluation indicator. That is the p

Tags: er diagram relational schema database designGet started with user needsThe main function diagram of the software design:Because users are divided into general users, operators, administrators. The first column is the function of the administrator, the second column is the function of the operator, and the third column is the function of the general user.Design of E-r diagram、Conversion of E-r diagram

candidate keys are called primary propertiesNon-primary attribute : A property that is not contained in a candidate key in a relational schema is called a non-primary property.Example:Relationship mode: Student (school number, name, gender, professional number, age) Condition: Student name not repeatSuper Key (school number, name, gender)Candidate Key (school number, name)Primary key: School number or name, but only one.FOREIGN Key: Professional nu

When designing a database storage mode, carefully analyze the data schema and don't put all the data together. Otherwise, the availability of the system, efficiency, scalability will have a serious impact. Of course, the system you design is very small and can be used in the simplest way.Through the business proficiency, from different angles to the data for mult

by Joe Celko,2013/09/18 (first published: 2010/05/25)The seriesThis article is part of the stair series: stair-to-database designNew tasks for designing and creating databases? Joe Celko is one of the most widely read writers on SQL, explaining these basics. as usual, he occasionally surprises the most seasoned database professionals. Joe became the recipient of the DBMS Magazine Reader's Choice Award for f

personally think the first thing to understand is what is the data operation without exception? What is the lowest degree of redundancy in data, can it achieve 0 redundancy? According to my summary in several books, as long as the non-primary attribute or the main attribute of the code of the partial dependency or transfer dependency, in the advanced is to eliminate the non-trivial and non-functional dependency of the multiple dependencies, eliminate the dependency of the candidate code is not

It's been a while. I had a disagreement with my colleague about whether the database set foreign KEY constraints. I'm sticking with foreign key constraints and they're against using foreign key constraints. So, there was this article.This article is mainly referring to the StackOverflow a topic on the website Is foreign keys really necessary in a databasedesign? ( http://stackoverflow.com/questions/18717/are-foreign-keys-really-necessary-in-a-