hrms database structure

Data structure optimizationOne, select the format of the data typeThe choice of data type, focusing on the appropriate two words, how to determine whether the selected data type is appropriate?1. Use the smallest data type that can save your data.2, using a simple data type, int is more simple than the varchar type in MySQL processing;3, use NOT NULL to define the field as far as possible;4, try to use less text type, non-use when it is best to consid

If you need to export database table structure descriptions in Word form, it can be handled easily by PowerDesigner, as follows 1.new model-> database-> update model from database Select Import SQL file or import from data source 2.report->-> New Create a new report model fill in the name type select physical D

, change the operation to be slow, do not overuse the index, the reasonable use index is very important. 3. Select the appropriate MySQL storage engine:3.1 MyISAM Storage EngineIf the table on the transaction requirements are not high, but also to query and add the main, consider MyISAM storage engine (such as BBS posting table and reply table);3.2 InnoDB Storage EngineHigh transaction requirements, stored data are important data, it is recommended to use the InnoDB storage engine (such as Acco

16.1 Data structure The current process information is not saved to any one of the sustainable environment, according to the suggestions of users, increase the function of storing workflow XML files. This feature is implemented using a database, and you can have more persistent ways. Depending on the implementation of the workflow engine, some engines require only an XML file configuration, and some engin

http://q.cnblogs.com/q/39658/ On the design of the table structure of the infinite Classification database, traversing the efficiency of all products under a certain classification The database table structure is like this: [Category] Category table ID (int) Category IDParentID (int) parent class IDname (nvarchar (50))

The traditional client/server architecture is coordinated and dispatched by the global things manager, which is tightly coupled.The current distributed database system adopts the client/server model based on middleware. Architecture of distributed large Data systems:Principal and subordinate (Master-slave): Bigtable, HbasePEER-TO-PEER ring structure: Cassandra, Dynamo Interpretation of the noun for large

During development projects, you often need to record the table structure of the database as a document to facilitate future maintenance. You can use the following SQL statement to get the table structure definition, which is convenient for copying to the document: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->

As mentioned earlier, the database server consists of two parts: instance and database.Where the database is used to store data, and the instance is used to access the data in the database.The instance includes a set of memory structures and background processes, and the structure of the database needs to be understood

I learned database (7)-the structure of the database system is in the software industry, and the software is structured. The database management system is a software after all, so we also talk about the structure. The structure of

December 21, 2007 At the beginning of the delivery and use of information systems, the database table structure is often designed with clear logic structures and the management usersHowever, when the information system project is running for a period of time, as the business continues to change and the processing process changes, the information system needs to be improved and modified from the front-end

publishing U. S., 2001] database design is the primary and basic content in the development of database application systems. Databases are the core and foundation of information systems. It organizes a large amount of data in the information system according to a certain model, It provides the function of storing, maintaining, and retrieving data. It is convenient, timely, and accurate for the information

Oracle442 application scenarios --------- physical structure of Oracle Database ------------------------- Physical structure of Oracle Database ------------------------------- Physical Structure of Oracle DatabaseOracle data is actually saved in the form of files, which ar

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Label:The architecture of an Oracle database consists of four aspects: the physical structure, logical structure, memory structure, and process of a database. 　　 1. Physical Structure 　　 The physical

Label: -------------------------the physical structure of the Oracle database------------------------------- Oracle Database Physical StructureOracle's data is actually saved in the form of a file in which the user's data is saved,You also need to save management data and log data, and so on. As a DBA, you need to know where your data is stored separately,and exp

Http://www.cnblogs.com/RunForLove/p/5693986.htmlThe three paradigms of database design: 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

2.1.1unlike other database products, Oracle has its own unique system architecture. The Oracle system architecture is the framework of the entire ORACLE Server System and the basis and core for managing and applying ORACLE data servers. The Oracle system architecture consists of three parts: logical structure, physical structure, and instance. The instance is the

From class model conversion to database table structure thinking Aaron converts class model to database table structure, or from UML class diagram to erdiagram, this function is not practical. Why? If your class model can be fully converted into a table structure (each table

I. Physical Structure: 1. Data Files: the Oracle database contains several data files. data files are used to store database data, including tables and indexes. Several data files I. Physical Structure: 1. Data Files: the Oracle database contains several data files. data fil

Tags: conceptual model database design structure informationConceptual structure DesignWhat is conceptual structure designThe process of abstracting the user requirement analysis into the information structure i.e. the conceptual model is the conceptual