transactional database vs relational database

Tags: differentiating CTC identity sel paradigm Problem _id Third paradigm RelationshipThe sixth chapter of relational data theory This chapter explains the relationship normalization theory in detail, which is not only the important theoretical foundation of relational database but also the powerful tool of database d

. The Minimum Redundancy must be achieved on the premise that the decomposed database can express all information of the original database. Its fundamental goal is to save storage space, avoid data inconsistency, improve the efficiency of relational operations, and meet application requirements. In fact, it is not necessarily required that all models reach bcnf.

After the concept of database was put forward, several data models appeared successively. There are three kinds of basic data models: Hierarchical model system, network model system, and relational model system. The relationship model proposed in the late 60 has the characteristics of simple and flexible data structure, easy to understand and strong mathematical foundation, and it has been popular since the

Brief introduction:Redis is an open-source, high-performance key-value system that can be used to cache or store data.Redis data can be persisted and supports multiple data types: string, list, hash (hash), set (set), and ordered set (sorted set).Can be a good complement to the relational database. It also offers a variety of client-side Python, Ruby, Erlang, and PHP that can be easily invoked.Persistence:R

Tags: relational database Database system query optimization relationshipQuery optimizationHas a very important position in the relational database system.Relational query optimization is a key factor affecting RDBMS performanceBecause the semantic level of the

Recently, a large number of new relational databases have sprung up in clouds outside the cloud. One of the key messages released here is: "If you want to get rich and on-demand scalability, you need a database that is not relational." ” If this is true, then is this not a sign that the once powerful relational

Index Understand the related tables. FOREIGN key JOIN and maintain referential integrity For some suggestions on joins, subquery VS. Linked table Query I found that there is a tutorial in the MySQL documentation, but the concept does not seem to mention, just tell you how (statement), did not tell you the cause and consequences (principle). Want to see a book with vivid explanations, such as the one that will give the various joins the VN diagram, and do not know how to fin

Document directory 4) Check Integrity Constraint rules-how to execute Integrity Constraint rules in actual operations Introduction to database application development-basic concepts in relational databases are written before: relational databases are currently the most widely used databases. Understanding the basic concepts of

(1nf) means that each column in the database table is an inseparable basic data item, that is, an attribute in the entity cannot have multiple values or duplicate attributes. In any relational database, the first paradigm (1nf) is the basic requirement for the relational model. databases that do not meet the first par

Tags: first paradigm sharp customer vanishing subset keyword cell problem processing log In order to establish a relatively small and reasonable relational database, we must follow certain rules when designing relational database, that is, the design paradigm of relational d

Object-oriented is developed from the basic Principles of software engineering (such as coupling, aggregation and encapsulation), and the relational database is developed from the mathematical theory, the two sets of theories have distinct differences, and Java is a completely object-oriented language, and this conflict is becoming more and more obvious. For the current information system of Java EE, the pr

1.1.1 What is relational dataRelational data is data that is represented by a relational mathematical model. The relational mathematical model describes the data in the form of a two-dimensional table, as shown in tables 1.1 and 1.2.1.1.2 What is a relational database1. What is the main code (primary key)A combination

-sized enterprises. The experimental case is written by Luca Sinico (infocamere software developer) Experiment OverviewInfocamere in the second half of 2016 to carry out the field of graphic database inspection, the purpose of the work is to investigate the main characteristics of the technology; Compare some of the available products and relational solutions on the market in terms of concepts and

Nowadays, the BigTable (column family) database is used more and more widely, and the function is very powerful. But many people still regard it as a relational database in use, with the original relational database thinking to build tables, storage, query. This article take

The next step is to explain each level of the paradigm, firstThe first paradigm (1NF). Conforms to the 1NF relationship (you can understand it as a data table.) The difference between "relationship" and "relationship pattern" is similar to the difference between "class" and "Object" in object-oriented programming. "Relationship" is an example of "relational pattern", you can understand "relationship" as a table with data, and "

MYSQL demonstrates the isolation level of the relational database. the concurrent access to the relational database has the following problems: Dirty read: For two things T1 and T2, T1 reads fields that have been updated by T2 .. If T2 is rolled back, the content read by T1 is temporary and invalid. Non-repeated re

A solution to the database sub-table of relational databasesWhen a relational database library or a single table reaches a certain level of data, a performance bottleneck occurs for a single node. The usual practice is to consider the sub-database table.Why do you want to di

In addition to using files or SharedPreferences to store data, you can also choose to use the SQLite database to store data. On the Android platform, an embedded relationship is integrated. In addition to using files or SharedPreferences to store data, you can also choose to use the SQLite database to store data. On the Android platform, an embedded relationship is integrated. In addition to using files

Eloquent ORM (Object relational mapping) ORM, the Object-relational Mapping (Object relational mapping), is a mapping between relational databases and business entity objects, so that we don't have to deal with complex SQL statements when we're working with specific business objects. Simply manipulate the properties an

Mapddb: A Distributed Relational Database System with row-based keywords. It is mainly used to solve horizontal expansion of the database system. In a real Internet business application system, the database processing capability of the original system cannot keep up with the growth of the business scale, generally, you