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Original link: http://coding-geek.com/how-databases-work/#Buffer-replacement_strategiesThe cache chapters are translated first, and the other chapters are translated later. Contents of translation in the original text:first, Data managerThe data query performs a query operation that fetches data from the data table and sends a request to data manger to get the information. There are 2 questions: Relational data uses a thing model that cannot
Tags: MongoDB database command NoSQLMongoDB is a NoSQL database that uses the "set-oriented" (collection-oriented) principle, meaning that data is grouped in a dataset, called a collection (Collection). Each collection (Collection) has a unique identifying name in the
Tags: ar data sp on C R database BS informationA cursory look at the introduction of relational database paradigm, simply record your understandingThe first paradigm: refers to the attribute to atomic, that is, the attribute can not be split again. For example, a person table, where a field
2015 China Database Conference Mongodb sharing, 2015 mongodbThis article was shared by MongoDB Greater China technical consultant. When the "old man" came up, he asked what Mongo meant. He guessed the prize and claimed that he was the best MongoDB expert (in the kite surfing circle... ). I believe everyone does not kno
Label:sqlite-Open source, cross-platform, compact relational database-1 Learn SQLite database in 1 hours 1. Introduction SQLite is an open-source, embedded relational database that implements a self-contained, 0 configuration, tra
-related, database recovery and other DBA-related operations, and nosql Big data is more out of this range, streamline induction.There is a database of master-slave replication, read and write separation, data segmentation, clustering and so on are not on this basis, there is
A long time ago, I knew that Microsoft's Petshop was very classic. I took the time to study yesterday. At the beginning, I was not very familiar with what kind of membership is, run petshop to learn from login, but the user name and password do not know, and later found a more registered page, registered a page, only to find that you have to go from the database. It took so much time to finally return to th
the projection operation, because once a particular column is selected, duplicate rows may be generated, and the duplicate rows must be eliminated3, connection.A connection that is a connection condition by one of the attributes in one relationship that is equal to a property of another relationship.Logical Database D
Label:Original: http://www.cnblogs.com/linjiqin/archive/2012/04/01/2428695.html In order to build a database with small redundancy and reasonable structure, we must follow certain rules when designing database. In a relational database, this rule is called a paradigm. A para
DBMS (Database Management System) data management systemsRDBMS (relational database Management system) relational databases management systems The organizational structure of the data: Hierarchical typeMesh typeRelational (two-dimensional relational table) Note: A ta
This article describes information that uses a relational database to store the CFG (Control flowchart). In the query, a CTE is used for recursive queries in order to obtain the results of all dominate relationships. This article describes information that uses a relational databas
, attribution College===> department can rely on the school number, can also rely on the school of attribution. You can split the two tables into one. (School number, name, gender) (department, School of Attribution)Some basic requirements of relational database in relational schema designData redundancy in---> database
Label:Outline: A single data structure: RelationshipsTwo, relational operation: relational algebra language; relational calculus language; SQLIII. integrity constraints: Entities, references, user customizationsI. Integrity constraints1. Entity integrity: The individual components of the main attribute cannot be null values2. Referential integrity: The outer code
Implement phonetic ("sounds-like") name searches with double metaphone Part II: Visual Basic and relational database solutions by Adam Nelson For COM, only the usage is described here: regsvr32 metaphonecom. dll, then you can use mphone. computemetaphonekeys searchword, primarykey, alternatekey Relational databases
wp_term_relationships classification relationship table, as shown in (this figure is from the Northwestern University WordPress source code interpretation team: Wp_term_relationships classification relational table -- WordPress Database The association between the wp_term_relationships classification table and other data tables: The wp_term_relationships clas
apply it directly. I took this book in October this year, so I should practice it first. The previous video from instructor Yan jianling focuses on the specific operations in the database, there is not much to do with the necessary steps in database design, that is, the conversion from the conceptual model to the logi
database--the method of transforming from ER diagram to relational mapping Specific steps: 1.For each strong entity type E. Create a new table. Include as its columns, all the simple attributes and easy components of the composite attributes of E. Identify the PRI Mary Key and the alternate keys. Do not include any multi-valued attribute as a key. If The unique field of an entity
The origin of a Codd RDBMS12 law--rdbmsDesign phase of two-relational databaseThree design principlesFour naming rulesDatabase design, a cornerstone of the success of a software project. Many practitioners agree that database design is not really that important. The reality of the scene is quite similar, the number of
Because of the needs of the work, need to transfer the data in HDFs to the relational database to become the corresponding table, on the Internet to find the relevant data for a long, found that different statements, the following is my own test process: To use Sqoop to achieve this need, first understand what Sqoop is
(Reference: Http://baike.baidu.com/link?url=S0D7j6oZvh3pp16D-A61pyjNEDIvOXptihrroHPX63RBELqt7Uk-iymW4wtb-Sktkyimh-p0A_ Z_PMYGXCYAGMBL85VYNNNJZR2AUCV8SXU)1 First normal form (1NF): name, age do not put in the same column (currently it is not possible for anyone to do so)In any relational database, the first paradigm (1NF) is
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